What is a DT-Active Frame Grabber Control?

UM-19336-E
DT-Active Frame Grabber Controls
Getting Started Manual
Fifth Edition
October, 2006
Copyright © 2002-2006 by Data Translation, Inc.
All rights reserved.
Information furnished by Data Translation, Inc. is
believed to be accurate and reliable; however, no
responsibility is assumed by Data Translation,
Inc. for its use; nor for any infringements of
patents or other rights of third parties which may
result from its use. No license is granted by
implication or otherwise under any patent rights
of Data Translation, Inc.
Use, duplication, or disclosure by the United
States Government is subject to restrictions as set
forth in subparagraph (c)(1)(ii) of the Rights in
Technical Data and Computer software clause at
48 C.F.R, 252.227-7013, or in subparagraph (c)(2)
of the Commercial computer Software Registered Rights clause at 48 C.F.R., 52-227-19 as
applicable. Data Translation, Inc., 100 Locke
Drive, Marlboro, MA 01752
Data Translation, Inc.
100 Locke Drive
Marlboro, MA 01752-1192
(508) 481-3700
www.datatranslation.com
Fax: (508) 481-8620
E-mail: info@datx.com
Data Translation® is a registered trademark of
Data Translation, Inc. DT-Active Monochrome
Frame GrabberTM, DT-Active Camera Link Frame
GrabberTM, and MACH II SeriesTM are trademarks
of Data Translation, Inc.
All other brand and product names are
trademarks or registered trademarks of their
respective companies.
Table of Contents
About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Intended Audience. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
What You Should Learn from this Manual. . . . . . . . . . . . . . . . . . . 5
Organization of this Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Conventions Used in this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Related Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Where to Get Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
What is a DT-Active Frame Grabber Control? . . . . . . . . . . . . . . . 10
Overview of Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Adding the Control to Your Project . . . . . . . . . . . . . . . . . . . . . . . . 13
Visual Basic 6.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Visual C++ 6.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Visual Studio .NET Project. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Using the Example Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Using the Online Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Removing the Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Chapter 2: Summary of Properties, Methods, and Events 21
General Imaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Input Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Active Video Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Region of Interest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Line-Scan Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Overlay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Camera Control Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3
Contents
Sync Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Expose/Reset Output Pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Integrate Output Pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Strobe Output Pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Digital I/O. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Chapter 3: Programming Flowcharts. . . . . . . . . . . . . . . . . . 35
Chapter 4: Product Support . . . . . . . . . . . . . . . . . . . . . . . . . 57
Chapter 5: Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
4
About this Manual
This manual describes how to install, set up, and use the DT-Active
Frame Grabber™ controls to develop application programs for Data
Translation® MACH II Series frame grabber boards.
Intended Audience
This manual is intended for engineers, scientists, technicians, or
others responsible for developing imaging or machine vision
application programs using Microsoft® Visual Basic® or Microsoft
Visual C++®.
It is assumed that you are a proficient programmer, that you are
experienced programming in the Windows 2000 or Windows XP
operating environment on the IBM® PC or compatible computer
platform, that you have familiarity with imaging or machine vision
principles, and that you have clearly defined your requirements.
What You Should Learn from this Manual
This manual summarizes the properties, methods, and events
provided by DT-Active Frame Grabber controls and describes how to
use the properties, methods, and events to develop an imaging or
machine vision program. Using this manual, you should be able to
successfully get started writing an application program.
This manual is intended to be used with the online help for the
DT-Active Frame Grabber control that you are using. The online help
contains all of the specific reference information for each of the
properties, methods, and events.
5
About this Manual
Organization of this Manual
This manual is organized as follows:
• Chapter 1, “Introduction,” describes how to add a DT-Active
Frame Grabber control to your project, how to use the example
programs and online help, and how to remove the software.
• Chapter 2, “Summary of Properties, Methods, and Events,”
summarizes the properties, methods, and events provided with
the DT-Active Frame Grabber controls.
• Chapter 3, “Programming Flowcharts,” provides programming
flowcharts for using the properties, methods, and events
provided with the DT-Active Frame Grabber controls.
• Chapter 4, “Product Support,” describes how to get help if you
have trouble using a DT-Active Frame Grabber control.
A glossary and an index complete this document.
Conventions Used in this Manual
The following conventions are used in this manual:
• Notes provide useful information that requires special emphasis,
cautions provide information to help you avoid losing data or
damaging your equipment, and warnings provide information to
help you avoid catastrophic damage to yourself or your
equipment.
• Items that you select or type are shown in bold. Property,
method, and event names are also shown in bold.
• When navigating the screens, an instruction such as Configure |
Board means to select “Board” from the drop-down menu under
“Configure.”
6
About this Manual
Related Information
Refer to the following documentation for more information on using
the DT-Active Frame Grabber controls:
• Online help for the DT-Active Frame Grabber control that you
are using. The online help contains all of the specific reference
information for each of the properties, methods, and events
provided by the DT-Active Frame Grabber control. Refer to
page 18 for information on how to open the help file.
• Device-specific documentation. Data Translation devices are
shipped with a getting started manual and a user’s manual. The
getting started manual describes how to install the device, how to
install the device driver for the device, and how to get started
using the device. The user’s manual describes the features,
specifications, and connector pin assignments of the device, and
the property values supported by the device.
Refer to the following documentation for programming information:
• The Microsoft documentation for your operating system.
• The online help for your programming environment.
Where to Get Help
Should you run into problems installing or using a DT-Active Frame
Grabber control, the Technical Support Department is available to
provide technical assistance. Refer to Chapter 4, “Product Support,”
for information on how to contact the Technical Support Department.
If you are outside the U.S. or Canada, call your local distributor,
whose number is listed in your Data Translation product handbook
or contact the Data Translation web site (www.datatranslation.com).
7
About this Manual
8
1
Introduction
What is a DT-Active Frame Grabber Control? . . . . . . . . . . . . . . . 10
Overview of Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Adding the Control to Your Project . . . . . . . . . . . . . . . . . . . . . . . . 13
Using the Example Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Using the Online Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Removing the Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9
Chapter 1
What is a DT-Active Frame Grabber
Control?
A DT-Active Frame Grabber control is an ActiveX® control that
allows you to develop imaging and machine vision application
programs in Visual Basic and Visual C++. You use a DT-Active
Frame Grabber control as you would use any other ActiveX or OLE
custom control in your Windows application.
Each DT-Active Frame Grabber control provides the following
features:
• Properties, methods, and/or events – Each DT-Active Frame
Grabber control has unique properties, methods, and events,
described as follows:
− Properties represent the variables that allow you to configure
the operation. Properties are accessible through the Properties
window and through the control’s custom Property Pages.
Some properties are read-only and provide information about
your operation.
− Methods are tools that you can use in your code to provide
run-time control of operations. Some methods are accessible
through the control’s custom Property Pages.
− Events are actions that cause code to be executed when an
event occurs.
• Multiple-device support – DT-Active Frame Grabber controls
are hardware-independent. You can add support for new devices,
without altering or recompiling code at the application level, by
adding a new device driver. You install the device driver
separately (in the Windows environment); refer to the getting
started manual for your device for more information on installing
device drivers.
10
Introduction
Note that at the present time, the DT-Active Monochrome Frame
Grabber control supports the DT3162 frame grabber board and
the DT-Active Camera Link Frame Grabber control supports the
DT3145 frame grabber board.
Note: The list of supported devices is constantly expanding.
Refer to the Data Translation web site
(www.datatranslation.com) for information on the devices and
device drivers available for use with DT-Active Frame Grabber
controls.
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11
Chapter 1
Overview of Tasks
The following is an overview of the tasks required to install and use a
DT-Active Frame Grabber control:
1.
Make sure that the DT-Active Frame Grabber control has been
installed. Typically, you install the appropriate DT-Active Frame
Grabber control when you install the device driver for your
imaging device. Refer to your device-specific documentation for
installation instructions.
2.
Add the DT-Active Frame Grabber control to your project. For
more information, refer to the next section.
3.
Create your application program. For more information, refer to
your programming language documentation.
If you have problems installing or using a DT-Active Frame Grabber
control, refer to page 18 for information on accessing the online help,
or refer to Chapter 4, “Product Support,” for information on
contacting Data Translation’s Technical Support Department.
12
Introduction
Adding the Control to Your Project
The following sections describe how to add a DT-Active Frame
Grabber control to a Visual Basic 6.0 project, Visual C++ 6.0 project, or
a Visual Studio .NET project.
1
1
Visual Basic 6.0
To add a DT-Active Frame Grabber control to a Visual Basic 6.0
project, perform the following steps:
1.
Select Project | Components.
The Components dialog box appears.
2.
Click the Controls tab.
3.
Select the appropriate DT-Active Frame Grabber control(s), then
click OK.
When the DT-Active Frame Grabber control is loaded, the
appropriate icon, shown below, appears in the toolbox.
DT-Active Frame
Grabber Control
Monochrome
Camera Link
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Icon
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Chapter 1
Visual C++ 6.0
To add a DT-Active Frame Grabber control to a Visual C++ 6.0
project, perform the following steps:
1.
Start Microsoft Visual C++ 6.0.
2.
Create a new MFC project using the appropriate application
wizard. Make sure that you add support for ActiveX controls.
3.
Select Project | Add to Project | Components and Controls.
The Component and Controls Gallery dialog box appears.
4.
Double-click the Registered ActiveX Controls folder.
5.
Select the appropriate DT-Active Frame Grabber control, then
click Insert.
The program prompts you to insert the component and to confirm the
creation of a wrapper class for accessing the control through Visual
C++.
6.
If you intend to use DT-Active Frame Grabber control events, use
the Class Wizard to add the event handlers.
Note: Several DT-Active Frame Grabber control methods use
enumerated variables. To ensure that these enumerated variables are
recognized in Visual C++, make sure that you add the following line
to the beginning of your application program:
#import “x:\Path\Control.DLL” no_namespace
where x:\Path is the complete path to the location of the appropriate
.DLL file on your system, and Control indicates the specific
DT-Active Frame Grabber control you are using. For example, if you
are using the DT-Active Monochrome Frame Grabber control under
Windows 2000, you might use the following line:
#import “c:\WINNT\system32\DTFGCTLS.DLL” no_namespace
14
Introduction
Visual Studio .NET Project
To add a DT-Active Frame Grabber control to a Visual Studio .NET
project, perform the following steps:
1.
Launch Microsoft Visual Studio .NET 2003.
2.
Create a new project by selecting File -> New -> Project.
3.
Select the Project Type (Visual Basic, Visual C++, and so on), and
then select Template – Windows Application.
4.
Enter the Name and Location of the project, and then click OK.
5.
Select View -> Toolbox.
6.
Right-click the Components (or General) tab in the Toolbox
window, and then select Add/Remove Items.
7.
Select the COM Components tab.
8.
Select the appropriate DT-Active Frame Grabber control(s), and
then click OK.
The appropriate icon, shown below, appears in the toolbox-components
area.
DT-Active Frame
Grabber Control
Monochrome
Camera Link
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Icon
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15
Chapter 1
9.
From the Components tab in the Toolbox window, select the
appropriate DT-Active Frame Grabber control(s), and then
drag-and-drop them onto your project’s form.
The selected DT Controls now appear on your form.
10. Double-click the workspace on the project’s form to start
programming.
The following example code shows how to open a DT3162 frame
grabber board, acquire an image, and draw the image to the control:
Private Sub Form1_Load(ByVal sender As
System.Object, ByVal e As System.EventArgs)
Handles MyBase.Load
'Open device during form load.
AxDTAFGMON1.OpenDevice(("DT3162-1"))
End Sub
Private Sub Button1_Click(ByVal sender As
System.Object, ByVal e As System.EventArgs)
Handles Button1.Click
'ACQUIRE button
'Allocate and acquire image frame. Then draw the
'image to the control and a PictureBox.
Call AxDTAFGMON1.AcquireMem(PictureBox1.
Handle.ToInt32, 1,
DTFGCTLSLib.AcquireModeEnum.SinglePassSync)
Call AxDTAFGMON1.AcquireMem(0, 1,
DTFGCTLSLib.AcquireModeEnum.SinglePassSync)
End Sub
Private Sub Button2_Click(ByVal sender As
System.Object, ByVal e As System.EventArgs)
Handles Button2.Click
'EXIT button
End
End Sub
16
Introduction
Using the Example Programs
Two simple example programs are shipped with each DT-Active
Frame Grabber control (one for Visual Basic and one for Visual C++).
The example programs allow you to open a device and acquire image
data to an internal memory buffer. You can modify the example
programs to suit your particular needs and then compile the code in
your particular development environment.
In addition, the DT-Acquire utility programs are provided on the
Imaging OMNI CD that ships with your Data Translation device. Use
DT-Acquire2 to familiarize yourself with the basic features of the
DT-Active Monochrome Frame Grabber control; use DT-AcquireCL
to familiarize yourself with the basic features of the DT-Active
Camera Link Frame Grabber control. For more information about a
DT-Acquire utility program, refer to the getting started manual for
your device.
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1
1
1
Note: Additional example programs will be provided on the Data
Translation web site (www.datatranslation.com) as they become
available.
To open the example program in Visual Basic or Visual C++, perform
the following steps:
1.
Open Visual Basic or Visual C++.
2.
For Visual Basic, select Programs | Data Translation, Inc from
the Windows Start menu, select the name of your imaging
device, and then select VB Example Project.
For Visual C++, select Programs | Data Translation, Inc from the
Windows Start menu, select the name of your imaging device,
and then select C++ Example Project.
3.
Compile the program, then run it.
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17
Chapter 1
Using the Online Help
This manual is intended to be used with the online help for the
DT-Active Frame Grabber control that you are using. The online help
contains all of the specific reference information for each of the
properties, methods, and events.
To open the online help, click Programs | Data Translation, Inc from
the Windows Start menu, select the name of your imaging device,
and then select the online help for the DT-Active Frame Grabber
control that you are using. To access context-sensitive help while
using the DT-Active Frame Grabber control property pages, either
highlight a property in the Properties window and then press F1 or
click the Help button in one of the tabs in the property pages. The
help topic associated with that property/tab appears.
18
Introduction
Removing the Software
If you are having problems with a DT-Active Frame Grabber control,
you may want to remove the control and then reinstall it. To remove a
DT-Active Frame Grabber control, exit your programming
environment, then click Settings | Control Panel from the Start
menu. Double-click Add/Remove Programs. Select the name of your
imaging device, and then click Add/Remove. All applicable files and
file settings are removed.
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19
Chapter 1
20
2
Summary of Properties,
Methods, and Events
General Imaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Input Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Active Video Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Region of Interest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Line-Scan Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Overlay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Camera Control Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Sync Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Expose/Reset Output Pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Integrate Output Pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Strobe Output Pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Digital I/O. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
21
Chapter 2
This chapter provides a summary of the properties, methods, and
events used in the DT-Active Monochrome Frame Grabber control
and the DT-Active Camera Link Frame Grabber control. For more
detailed information, refer to the online help for the control. Refer to
page 18 for information on opening the online help.
Note: The properties described in this chapter are appropriate for
Visual Basic only. If you are using Visual C++, use the associated
Visual C++ methods instead. For example, to set and/or return the
pixel clock source, use the Visual C++ SetPixelClockSource and
GetPixelClockSource methods instead of the Visual Basic
PixelClockSource property. For more information about Visual C++
methods, refer to the DT-Active Frame Grabber control online help.
General Imaging
Property/Method
Name
22
Description
Control
OpenDevice method
Opens a device.
Monochrome
Camera Link
CloseDevice method
Closes the device previously opened
using the OpenDevice method.
Monochrome
Camera Link
ActiveDevice property
Closes any open device and opens the
device with the specified name; returns
the name of the currently open device.
Monochrome
Camera Link
GetDeviceName
method
Returns the name of the device
associated with a device ID.
Monochrome
Camera Link
DeviceCount property
Returns the number of available
devices.
Monochrome
Camera Link
DeviceType property
Returns the type of the active device.
Monochrome
Camera Link
Summary of Properties, Methods, and Events
General Imaging (cont.)
Property/Method
Name
Description
2
Control
DeviceBusy property
Returns the state of the active device.
Monochrome
Camera Link
DrawXOrigin property
Sets and returns the element in the
buffer that represents the x-position of
the first pixel to draw in the destination
window (x-origin).
Camera Link
Sets and returns the element in the
buffer that represents the y-position of
the first pixel to draw in the destination
window (y-origin).
Camera Link
StatusMessage
property
Returns the status message
corresponding to the current device
status code.
Monochrome
Camera Link
Timeout property
Sets and returns the timeout period
used by the software.
Monochrome
Camera Link
DisplayMode property
Sets and returns the way that you want
to display images when setting up your
application (DDI or GDI).
Camera Link
LoadConfigFile method
Opens a device configuration file and
applies its settings to the current
instance of the control.
Monochrome
Camera Link
SaveConfigFile method
Saves the current device configuration
to a device configuration file.
Monochrome
Camera Link
ShowPropPages
method
Displays one or more of the property
pages.
Camera Link
DrawYOrigin property
2
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23
Chapter 2
Input Source
Property/Method Name
24
Description
Control
PixelClockSource property
Sets and returns the pixel clock
source.
Monochrome
Calibrate method
Automatically adjusts the quality of
the images.
Monochrome
Contrast property
Sets and returns the contrast level
for the incoming video.
Monochrome
Brightness property
Sets and returns the brightness
level for the incoming video.
Monochrome
HSyncInPolarity property
Sets and returns the polarity of the
horizontal (line) sync of an
incoming variable-scan video
signal.
Monochrome
VSyncInPolarity property
Sets and returns the polarity of the
vertical (field) sync of an incoming
variable-scan video signal.
Monochrome
SyncInSource property
Sets and returns the source of the
incoming sync signal.
Monochrome
LineFrequency property
Sets and returns the frequency of
an incoming horizontal video line.
Monochrome
VideoInputSource property
Sets and returns the video input
source used for acquisitions.
Monochrome
DataFormat property
Sets and returns the data format
used.
Camera Link
ActiveLUT property
Sets and returns the look-up table
(LUT) that you want to use.
Monochrome
Camera Link
LoadLUTFromArray
method
Loads a look-up table (LUT) with
data from an array.
Monochrome
Camera Link
LoadLUTFromFile method
Loads a look-up table (LUT) with
data from a file.
Monochrome
Camera Link
Summary of Properties, Methods, and Events
Input Source (cont.)
Property/Method Name
Description
Control
SaveLUTToArray method
Saves a look-up table (LUT) with
data to an array.
Camera Link
SaveLUTToFile method
Saves a look-up table (LUT) with
data to a file.
Camera Link
2
2
2
Active Video Area
Property Name
TotalPixelsPerLine property
Description
Control
Sets and returns the total
number of pixels in a single
horizontal line of video (the
number of pixels that are not
black).
Monochrome
Sets and returns the total
number of lines in a frame of
video.
Monochrome
FirstActivePixel property
Sets and returns the position of
the beginning of the active video
signal on the line.
Monochrome
FirstActiveLine property
Sets and returns the position of
the beginning of the active video
signal within the field.
Monochrome
ActivePixelCount property
Sets and returns the number of
pixels per line in the active video
area (Monochrome) or the
number of pixels per line
supported by your camera
(Camera Link).
Monochrome
Camera Link
TotalLinesPerFrame property
2
2
2
2
2
2
25
Chapter 2
Active Video Area (cont.)
Property Name
Description
Control
ActiveLineCount property
Sets and returns the number of
lines per frame in the active
video area (Monochrome) or the
number of active lines supported
by your camera (Camera Link).
Monochrome
Camera Link
ClampStart property
Sets and returns the clamp start
position.
Monochrome
ClampEnd property
Sets and returns the clamp end
position.
Monochrome
Region of Interest
Property Name
Description
Control
ROIHeight propertya
Sets and returns the number of
lines in the ROI that you want to
save/acquire.
Monochrome
Camera Link
ROILeft propertya
Sets and returns the position of the
first pixel of the ROI that you want
to save/acquire.
Monochrome
Camera Link
ROITop propertya
Sets and returns the position of the
first line of the ROI that you want to
save/acquire.
Monochrome
Camera Link
ROIWidth propertya
Sets and returns the number of
pixels in each line of the ROI that
you want to save/acquire.
Monochrome
Camera Link
a. For the DT-Active Frame Grabber Camera Link control, this property is used for area-scan
operations only.
26
Summary of Properties, Methods, and Events
Line-Scan Operations
Property Name
Description
2
Control
LineScanLeft property
Sets and returns the position of the
first pixel of the line(s) that you
want to acquire.
Camera Link
LineScanWidth
property
Sets and returns the number of
pixels in the line(s) that you want to
acquire.
Camera Link
LineScanFrameHeight
property
Sets and returns the number of
lines that you want to acquire.
Camera Link
LineScanFrameTrigger
Enabled property
Enables and disables the use of the
frame trigger.
Camera Link
LineScanFrameTrigger
Transition property
Sets and returns the transition type
for digital input line 0 when it is
used as a frame trigger.
Camera Link
2
2
2
Overlay
Property/Method/Event
Name
2
2
Description
Control
OverlayEnabled property
Enables and disables the use of
overlays.
Monochrome
Camera Link
OverlayBitmapFile property
Sets and returns the complete
path to an overlay bitmap file.
Monochrome
Camera Link
OverlayColorKey property
Sets and returns the color key for
an overlay bitmap file.
Monochrome
Camera Link
2
2
2
27
Chapter 2
Overlay (cont.)
Property/Method/Event
Name
OnUpdateOverlay event
Description
Generated by the control
whenever a frame/ROI is
acquired; returns the DTOverlay
object that holds the overlay
information.a
Control
Monochrome
Camera Link
a. For more information about DTOverlay objects, refer to the online help for your control.
Trigger
Property Name
Description
Control
TriggerType property
For area-scan mode, sets and
returns the type of the ROI trigger.
For line-scan mode, sets and returns
the type of the line trigger.
Monochrome
Camera Link
TriggerTransition
property
Sets and returns the transition type
for an external trigger.
Monochrome
Camera Link
Camera Control Output
28
Property Name
Description
Control
TimeGranularity property
Sets and returns the time granularity
used by the camera control output
signals (in microseconds).
Camera Link
CameraControlOutput1
property
Sets and returns the output signal
assigned to camera control output
line 1.
Camera Link
Summary of Properties, Methods, and Events
Camera Control Output (cont.)
Property Name
Description
Control
CameraControlOutput2
property
Sets and returns the output signal
assigned to camera control output
line 2.
Camera Link
CameraControlOutput3
property
Sets and returns the output signal
assigned to camera control output
line 3.
Camera Link
CameraControlOutput4
property
Sets and returns the output signal
assigned to camera control output
line 4.
Camera Link
2
2
2
2
Sync Output
Property Name
Description
Control
SyncOutEnabled property
Enables and disables the
outgoing sync signal.
Monochrome
HSyncOutPulseWidth property
Sets and returns the width of
the outgoing horizontal sync
pulse.
Monochrome
VSyncOutPulseWidth property
Sets and returns the width of
the outgoing vertical sync pulse.
Monochrome
LineFrequency property
Sets and returns the frequency
of an outgoing horizontal video
line.
Monochrome
SyncOutPolarity property
Sets and returns the polarity of
the outgoing sync pulses.
Monochrome
2
2
2
2
2
29
Chapter 2
Expose/Reset Output Pulse
Property Name
Description
ExposeEnabled property
Enables and disables the
expose/reset output pulse.a
Monochrome
Camera Link
ExposePolarity property
Sets and returns the polarity of
the expose/reset output pulse.a
Monochrome
Camera Link
ExposeStartLine property
Sets and returns the start
position of the expose/reset
output pulse.a
Monochrome
ExposeStopLine property
Sets and returns the stop
position of the expose/reset
output pulse.a
Monochrome
VSyncDelay property
Sets and returns the number of
lines between the end of the
expose/reset output pulse and
the beginning of the outgoing
vertical sync.a
Monochrome
ExposeDelay property
Sets and returns the time delay
between the trigger event and
the beginning of the expose
output pulse.a, b
Camera Link
ExposePulseWidth property
Sets and returns the time that
the expose output pulse is in its
active state (determined by the
polarity).a, b
Camera Link
a. Applicable to asynchronous reset cameras only.
b. Multipled by the TimeGranularity to determine the value.
30
Control
Summary of Properties, Methods, and Events
Integrate Output Pulse
Property Name
Description
2
Control
IntegrateEnabled property
Enables and disables the
integrate output pulse.a
Camera Link
IntegratePolarity property
Sets and returns the polarity of
the integrate output pulse.a
Camera Link
IntegratePulseWidth property
Sets and returns the time that
the integrate output pulse is in its
active state (determined by the
polarity).a, b
Camera Link
2
IntegrateDelay property
Sets and returns the time delay
between the trigger event and
the beginning of the integrate
output pulse.a, b
Camera Link
2
2
a. Applicable to line-scan cameras.
b. Multipled by the TimeGranularity to determine the value.
Strobe Output Pulse
Property Name
2
2
Description
Control
StrobeEnabled property
Enables and disables the strobe
output pulse.
Monochrome
Camera Link
StrobePolarity property
Sets and returns the polarity of the
strobe output pulse.
Monochrome
Camera Link
StrobeStartLine property
Sets and returns the start position
of the strobe output pulse.
Monochrome
StrobeStopLine property
Sets and returns the stop position
of the strobe output pulse.
Monochrome
2
2
2
31
Chapter 2
Strobe Output Pulse (cont.)
Property Name
Description
Control
StrobePulseWidth
property
Sets and returns the time that the
strobe output pulse is in its active
state (determined by the polarity).a
Camera Link
StrobeDelay property
Sets and returns the time delay
between the trigger event and the
beginning of the strobe output
pulse.a
Camera Link
a. Multipled by the TimeGranularity to determine the value.
Acquisition
Property/Method/Event Name
32
Description
Control
AcquireType property
Sets and returns the type of
acquisition that you want to
perform.
Monochrome
Camera Link
AcquireMem method
Acquires one or more
frames/ROIs (in area-scan
mode) or lines/frames (in
line-scan mode) to internal
memory buffers, displaying the
data in a window, if desired.
Monochrome
Camera Link
StopAcquire method
Stops the current acquisition.
Monochrome
Camera Link
GetBuffer method
Returns the DTBuffer object
associated with a buffer ID.a
Monochrome
Camera Link
GetBufferCount method
Returns the number of available
DTBuffer objects.a
Monochrome
Camera Link
OnAcquireComplete event
Generated by the control when
the acquisition is complete.
Monochrome
Camera Link
Summary of Properties, Methods, and Events
Acquisition (cont.)
Property/Method/Event Name
OnFrameComplete event
Description
Control
Generated by the control
whenever a buffer of data is
acquired; returns the DTBuffer
object that holds the most
recently acquired frame/ROI.a
Monochrome
Camera Link
OnFramesComplete event
Generated by the control
whenever a number of buffers of
data is acquired; returns the
DTEnumBuffers object that holds
the most recently acquired
buffers.b
Camera Link
OnAsyncError event
Generated by the control
whenever an error occurs during
an asynchronous acquisition;
returns the DTErrorInfo object
that holds the error information.c
Monochrome
Camera Link
a. For more information about DTBuffer objects, refer to the online help for your control.
b. For more information about DTEnumBuffers objects, refer to the online help for your control.
c. For more information about DTErrorInfo objects, refer to the online help for your control.
2
2
2
2
2
2
2
2
2
33
Chapter 2
Digital I/O
Property/Method/Event Name
34
Description
Control
InputLineCount property
Returns the number of digital input
lines supported by the device.
Monochrome
Camera Link
OutputLineCount property
Returns the number of digital
output lines supported by the
device.
Monochrome
Camera Link
ReadDigitalInputPattern
method
Returns the state (high or low) of all
the digital input lines.
Monochrome
Camera Link
WriteDigitalOutputPattern
method
Sets the state (high or low) of all
the digital output lines.
Monochrome
Camera Link
InputLineEventMask property
Sets and returns a bit mask,
indicating the digital input lines that
you want to use to generate
state-change events.
Monochrome
Camera Link
OnInputBitsChanged event
Generated by the control whenever
a digital input bit that has been
configured to generate a
state-change event changes state.
Monochrome
Camera Link
3
Programming Flowcharts
35
Chapter 3
This chapter provides a series of flowcharts showing an overview of
the steps required to perform each of the operations supported by the
DT-Active Frame Grabber controls. Although the flowcharts do not
show error/status checking, it is recommended that you check for
error/status messages after using each property, method, or event.
Notes: The properties described in this chapter are appropriate for
Visual Basic only. If you are using Visual C++, use the associated
Visual C++ methods instead. For example, to set and/or return the
pixel clock source, use the Visual C++ SetPixelClockSource and
GetPixelClockSource methods instead of the Visual Basic
PixelClockSource property. For more information about Visual C++
methods, refer to the online help for your control.
Some of the steps may not be required for the device/control that
you are using. For example, if you are using a DT3145 frame grabber
board with the DT-Active Camera Link Frame Grabber control, you
do not set the pixel clock source. For more information about the
steps that are required for your device/control. refer to the user’s
manual for your device.
36
Programming Flowcharts
3
Open a device with the OpenDevice
method or the ActiveDevice property.
Using a
device
configuration
file?
Yes
Open the device configuration file
and apply its settings with the
LoadConfigFile property.
3
3
No
Set the timeout period for the software
with the Timeout property.
Set up the incoming video signal
(see page 42).
3
3
Set up the sync output signal
(see page 44).
3
For the DT-Active Monochrome Frame
Grabber control, set the pixel clock source
to InternalSource, ExternalSource1, or
ExternalSource2 with the
PixelClockSource property.
3
Set up an ROI trigger
(see page 45).
3
Go to the next page.
3
37
Chapter 3
Continued from previous page.
Using a
device
configuration
file?
Yes
No
Set the acquisition type with the AcquireType
property.
Specify the active video area for
the input source (see page 46).
Using the
DT-Active
Camera
Link
Control?
Yes
Using
line-scan
mode?
Yes
Set up the line(s)
(see page 48).
No
No
Set up the ROI
(see page 47).
Set up overlays
(see page 50).
Go to the next page.
38
Programming Flowcharts
3
Continued from previous page.
Using a
device
configuration
file?
3
Yes
3
No
Change
values in
LUT?
No
Yes
Using an
array?
Yes
Load LUT 0 or 1 with
values from an array with
the LoadLUTFromArray
method.
No
Using a
file?
3
3
Yes
Load LUT 0 or 1 with
values from a file with the
LoadLUTFromFile
method.
3
No
3
3
Specify LUT 0 or 1 with
the ActiveLUT property.
Go to the next page.
3
39
Chapter 3
Continued from previous page.
Using a
device
configuration
file?
Yes
No
Set up a strobe output signal
(see page 51).
Set up an exposure/reset output signal
(see page 52).
Set up an integrate output signal
(see page 54).
Set up a general-purpose output signal
(see page 55).
Go to the next page.
40
Programming Flowcharts
Continued from previous page.
3
Acquire images to memory with the
AcquireMem method.
3
Continuous
operation?
No
Yes
Respond to the OnFramesComplete event
after the specified buffers are acquired.
3
When acquisition is complete, use the
StopAcquire method.
3
Respond to the OnAcquireComplete
event once the acquisition is complete.
Get a reference to the buffer array with the
GetBuffer method.
3
3
Get the total number of buffers in the array
with the GetBufferCount method.
Handle the buffers and manipulate
the data in your code.
Perform a digital I/O operation
(see page 56).
Close the device with
the CloseDevice method.
3
3
3
41
Chapter 3
Set up the Incoming Video Signal
Using the
DT-Active
Camera
Link
Control?
No
Yes
Specify the data format used (SingleMono8Bit,
SingleMono10Bit, SingleMono12Bit,
SingleMono14Bit, SingleMono16Bit,
DualMono8Bit, DualMono10Bit,
DualMono12Bit, RGBColor) with the
DataFormat property.
Specify an input source (0, 1, or 2)
with the VideoInputSource property.
Specify the source of the incoming sync
signal with the SyncInSource property.
Set the polarity of the incoming horizontal
sync pulse to ActiveHigh or ActiveLow with
the HSyncInPolarity property.
Return to the main flowchart.
Set the polarity of the incoming vertical sync
pulse to ActiveHigh or ActiveLow with the
VSyncInPolarity property.
Set the frequency of an incoming horizontal
video line with the LineFrequency property.
Automatically
adjust quality
of images?
Yes
Adjust quality of
image with the
Calibrate method.
No
Go to the next page.
42
Programming Flowcharts
Set up the Incoming Video Signal (cont.)
3
Continued from previous page.
Specify the contrast level
with the Contrast property.
Specify the brightness level
with the Brightness property.
Return to the main flowchart.
3
3
3
3
3
3
3
3
43
Chapter 3
Set up the Sync Output Signal
Using the
DT-Active
Camera
Link
Control?
Yes
No
Enable the outgoing sync signal with the
SyncOutEnabled property.
Set the frequency of an outgoing horizontal
video line with the LineFrequency property.
Set the width of the outgoing
horizontal sync pulse with the
HSyncOutPulseWidth property.
Set the width of the outgoing
vertical sync pulse with the
VSyncOutPulseWidth property.
Set the polarity of the outgoing sync
pulses to ActiveHigh or ActiveLow with
the SyncOutPolarity property.
Return to main flowchart.
44
Programming Flowcharts
Set up the Acquisition Trigger
3
Using
area-scan
mode?
No
Yes
3
Set the frame/ROI trigger type to Internal,
ExternalToStart, or ExternalForEach
with the TriggerType property.
Internal
trigger type?
3
No
Set the trigger transition to
OnHighToLow or
OnLowToHigh with the
TriggerTransition
property.
3
3
3
Yes
3
Return to the main flowchart.
3
3
45
Chapter 3
Specify the Active Video Area
Using the
DT-Active
Camera
Link
Control?
Yes
No
Set the clamp start position with the
ClampStart property.
Set the number of active pixels per line
supported by your camera with the
ActivePixelCount property.
Set the number of active lines
supported by your camera with the
ActiveLineCount property.
Set the clamp end position with the
ClampEnd property.
Set the first active pixel with the
FirstActivePixel property.
Set the number of active pixels per line
with the ActivePixelCount property.
Set the total pixels per line with the
TotalPixelsPerLine property.
Set the first active line with the
FirstActiveLine property.
Set the active line count with the
ActiveLineCount property.
Set the total lines per frame with the
TotalLinesPerFrame property.
46
Return to the main flowchart.
Programming Flowcharts
Set up the ROI
Specify the position of the first pixel of
the ROI that you want to save/acquire
with the ROILeft property.
Specify the position of the first line of
the ROI that you want to save/acquire
with the ROITop property.
Specify the number of pixels in each
line of the ROI that you want to
save/acquire with the ROIWidth
property.
Specify the number of lines in the ROI
that you want to save/acquire with the
ROIHeight property.
Return to the main flowchart.
3
3
3
3
3
3
3
3
3
47
Chapter 3
Set up the Line(s) for a Line-Scan Operation
Specify the position of the first pixel of
the line(s) that you want to acquire with
the LineScanLeft property.
Specify the number of pixels in the
line(s) that you want to acquire with the
LineScanWidth property.
Specify the number of lines that you
want to acquire with the
LineScanFrameHeight property.
Using an
external line
trigger?
Yes
No
Set the trigger type to Internal
with the TriggerType property.
Go to the next page.
48
Connect the external line trigger to the
external trigger input, set the trigger
type to ExternalForEach with the
TriggerType property, and set the
trigger transition to OnHighToLow or
OnLowToHigh with the
TriggerTransition property.
Programming Flowcharts
Set up the Line(s) for a Line-Scan Operation (cont.)
3
Continued from previous page.
Using
multiple
lines to build
a frame?
Yes
3
Set up overlays
(see page 50).
3
No
Using an
external
frame
trigger?
No
Yes
Connect the external frame trigger to
digital input line 0.
Enable the frame trigger with the
LineScanFrameTriggerEnabled
property.
Set the trigger transition to OnHighToLow or
OnLowToHigh with the
LineScanFrameTriggerTransition property.
3
3
3
3
Return to the main flowchart.
3
3
49
Chapter 3
Set up Overlays
Enable overlays with the
OverlayEnabled property.
Set the color key with
the OverlayColorKey property.
Using
bitmap file
on overlay
surface?
Yes
Specify path to file with
the OverlayBitmapFile
property.
No
Drawing
on overlay
surface?
No
Yes
Get a device context with
the GetDC method.
Respond to the OnUpdateOverlay event
whenever an ROI/frame is acquired.
Draw an image on the overlay surface with
standard GDI functions.
Release the device context with
the ReleaseDC method.
Return to main flowchart.
50
Programming Flowcharts
Set up a Strobe Output Signal
3
Set the TriggerType property to either
Internal (to acquire a single frame/ROI/line) or
ExternalForEach (to acquire one or more
frames/ROIs/lines) (see page 45).
3
Enable the strobe output pulse with the
StrobeEnabled property.
Using the
DT-Active
Camera Link
Control?
Yes
Assign the strobe output signal to the
appropriate camera control line with
the CameraControlOutput1,
CameraControlOutput2,
CameraControlOutput3, or
CameraControlOutput4 property.
3
3
No
Set the start position of the strobe output
pulse relative to the trigger with the
StrobeStartLine property.
Set the stop position of the strobe output
pulse relative to the trigger with the
StrobeStopLine property.
Set the polarity of the strobe output pulse to
ActiveHigh or ActiveLow with the
StrobePolarity property.
Set the width of the strobe output
pulse with the StrobePulseWidth
property.
Set the time delay between the
trigger event and the beginning of
the strobe output pulse with the
StrobeDelay property.
3
3
3
3
Return to the main flowchart.
3
51
Chapter 3
Set up an Expose/Reset Output Signal
Set the TriggerType property to either
Internal (ot acquire a single frame/ROI/line) or
ExternalForEach (to acquire one or more
frames/ROIs/lines) (see page 45).
Enable the expose/reset output pulse with
the ExposeEnabled property.
Using the
DT-Active
Camera
Link
Control?
Yes
No
Enable the outgoing sync signal with
the SyncOutEnabled property
(see page 44).
Assign the expose output signal to
the appropriate camera control line
with the CameraControlOutput1,
CameraControlOutput2,
CameraControlOutput3, or
CameraControlOutput4 property.
Set the polarity of the expose
output pulse to ActiveHigh or
ActiveLow with the with the
ExposePolarity property.
Specify the delay between the end of the
expose/reset output pulse and the
beginning of the vertical output sync with
the VSyncDelay property.
Set the width of the expose output
pulse with the ExposePulseWidth
property.
Specify the start position of the
expose/reset output pulse relative to the
trigger with the ExposeStartLine property.
Set the time delay between the
trigger event and the beginning of
the expose output pulse with the
ExposeDelay property.
Go to the next page.
Return to the main flowchart.
52
Programming Flowcharts
Set up an Exposure/Reset Output Signal (cont.)
Continue from the previous page.
Specify the stop position of the
expose/reset output pulse relative to the
trigger with the ExposeStopLine property.
Set the polarity of the expose/reset output
pulse to ActiveHigh or ActiveLow with the
with the ExposePolarity property.
Return to the main flowchart.
3
3
3
3
3
3
3
3
3
53
Chapter 3
Set up an Integrate Output Signal
Set the TriggerType property to either
Internal (to acquire a single ROI/line) or
ExternalForEach (to acquire one or more
ROIs/lines) (see page 45).
Enable the integrate output pulse with the
IntegrateEnabled property.
Assign the integrate output signal to the
appropriate camera control line with the
CameraControlOutput1,
CameraControlOutput2,
CameraControlOutput3, or
CameraControlOutput4 property.
Set the width of the integrate output pulse
with the IntegratePulseWidth property.
Set the time delay between the trigger
event and the beginning of the integrate
output pulse with the IntegrateDelay
property.
Set the polarity of the integrate output pulse
to ActiveHigh or ActiveLow with the with the
IntegratePolarity property.
Return to the main flowchart.
54
Programming Flowcharts
Set up a General-Purpose Output Signal
Set the TriggerType property to either
Internal (to acquire a single ROI/line) or
ExternalForEach (to acquire one or more
ROIs/lines) (see page 45).
Assign a Logical_High or Logical_Lo output
signal to the appropriate camera control
line with the CameraControlOutput1,
CameraControlOutput2,
CameraControlOutput3, or
CameraControlOutput4 property.
3
3
3
3
Return to the main flowchart.
3
3
3
3
3
55
Chapter 3
Perform a Digital I/O Operation
Write to all the digital output lines with the
WriteDigitalOutputPattern method.
Specify the digital input lines that will
generate an event on a change of state with
the InputLineEventMask property.
Respond to a digital input bit change of
state with the OnInputBitsChanged event.
Read all the digital input lines with the
ReadDigitalInputPattern method.
Return to the main flowchart.
56
4
Product Support
57
Chapter 4
Should you experience problems using a DT-Active Frame Grabber
control, perform the following steps:
1.
Read all the appropriate sections of this manual. Make sure that
you have added any “Read This First” information to your
manual and that you have used this information.
2.
Check the Imaging OMNI CD for a README file. If present, read
this file for the latest installation and configuration information.
3.
Make sure that you have installed the device driver, DT-Active
Frame Grabber control, and other software for your device
properly. For information, refer to the getting started manual for
your device.
4.
Make sure that you have installed your device properly. For
information, refer to the getting started manual for your device.
If you are still having problems, Data Translation’s Technical Support
Department is available to provide technical assistance. To request
technical support, go to our web site at
http://www.datatranslation.com and click on the Support link.
When requesting technical support, be prepared to provide the
following information:
• Your product serial number
• The hardware/software product you need help on
• The version of the CD you are using
• Your contract number, if applicable
If you are located outside the USA, contact your local distributor; see
our web site (www.datatranslation.com) for the name and telephone
number of your nearest distributor.
58
Glossary
Active Line Count
For the DT3162 frame grabber board, a line of data in the active video
area (the part of the incoming signal containing valid data). The first
active line defines the top of the active video area.
For the DT3162 frame grabber board, the number of lines of data
supported by your camera. Refer to your camera documentation for
more information. The height of the ROI that you want to acquire
must be less than or equal to the Active Line Count.
Active Video Area
The part of the incoming video signal that contains valid video data
(no blanking or sync information). It is the visible portion of the
incoming video signal.
Each line of video in the active video area contains horizontal sync
information, blanking information, and active video. Pixel
measurements are relative to the horizontal reference point, which is
defined as the beginning of the horizontal sync. In the horizontal
video signal, blanking occurs during the horizontal sync and image
border periods, which are defined by the front porch (before the
horizontal sync) and back porch (after the horizontal sync).
Each field of video in the active video area contains vertical sync
information, blanking information, and lines of active video. Line
measurements are relative to the vertical reference point, which is
defined as the beginning of the vertical sync.
See also total video area.
Asynchronous
An asynchronous function returns control to the caller before the
operation completes.
59
Glossary
Brightness Level
A value that you can use to move the entire grayscale range up and
down, making the digitized video lighter or darker.
Buffer
A location in internal memory that is intended to hold one acquired
ROI, one acquired line, or one acquired frame of multiple lines.
Channel
The analog-to-digital converter on the device through which the
video signal passes. If your device supports multiple channels, you
can receive multiple video signals at the same time (one on each
channel). See also video input source.
Clamp Period
A period when the device adjusts the input voltage from the camera
by shifting the input signal to 0 V. The active video area following the
blanking period is then referenced to that shift. You can specify the
start of the clamp period and the end of the clamp period.
Composite Signal
A signal in which the video and synchronization signals are
combined in a single signal.
Contrast Level
A value that you can use to emphasize the differences between light
and dark. By adjusting the contrast level, you can stretch or contract
the range of the incoming video.
DDI
DirectDraw Interface. One of the display modes that determines the
way that you want to display images when setting up your
application. Typically, you will use DDI mode; it is faster and
requires less system memory. See also GDI.
Device
A frame grabber board, such as the DT3162, DT3145, or other
hardware used to acquire images.
60
Glossary
Device Context
Referred to as a DC. A DC is a Windows Graphical Device Interface
(GDI) object. Refer to your Windows documentation for more
information.
Expose/Reset Pulse
A digital output pulse generated by some devices to control the
resetting or the exposure time of an asynchronous reset camera. The
exposure time is the amount of time that the shutter is open. You can
specify the polarity of the pulse (high-going or low-going), the time
delay from a trigger event to the start of the exposure, and the length
of time the shutter is open. The expose output signal is typically used
in area-scan mode. Note that for the expose/reset pulse to work as
programmed, you must adjust the physical settings on your camera
appropriately.
For the DT3162 frame grabber board, the expose/reset pulse is
connected to your camera through a Camera Interface Module (CIM).
For the DT3145 frame grabber board, the expose output pulse is
connected to your camera through the camera link connector.
External Trigger
A trigger that is connected to the device through a dedicated external
line.
Field
The collection of horizontal lines between two consecutive vertical
sync signals. For interlaced images, two fields (odd and even) make
up a single frame.
61
Glossary
Frame
For the DT3162 frame grabber board, a collection of video data. An
interlaced frame consists of an odd field and an even field, where one
field is drawn in the first pass and the other field is drawn in the next
pass. A noninterlaced frame (progressive scan) consists of the
complete frame, where all lines are drawn in a single pass.
For the DT3145 frame grabber board, the definition of a frame
depends on whether you are using area-scan mode or line-scan
mode. In area-scan mode, a frame is the portion of the video that is
defined by the Frame_Valid and Line_Valid signals; the portion of
the frame that you want to acquire is determined by the ROILeft,
ROIWidth, ROITop, and ROIHeight properties. In line-scan mode, a
frame is a series of lines acquired into a single buffer. You can use
these frames built from multiple lines in frame-based software
packages, such as DT Vision Foundry and GLOBAL LAB Image/2.
Frame Trigger
A trigger that allows you to control the acquisition of frames in
line-scan mode. On the DT3145 frame grabber board, the frame
trigger input is provided through digital input line 0 (pin 1 of
connector J2). You can access this signal using the STP15 screw
terminal panel. The frame trigger must have a minimum pulse width
of 10 μs.
GDI
Graphics Display Interface. One of the display modes that determines
the way that you want to display images when setting up your
application. If you receive an error when acquiring very large
ROIs/lines/frames (typically, larger than 2K x 2K), you can try
reducing the size of the ROI/line/frame, increasing the memory in
your graphics card, updating the driver for your graphics card, or
changing the display mode to GDI. See also DDI.
62
Glossary
Identity LUT
A look-up table in which the pixel data is passed through the LUT
unchanged. For example, for 8-bit data, a pixel input value of 255 has
an output value of 255.
Integrate Pulse
A digital output pulse generated by some devices to control the
exposure time of a line-scan camera. The integrate time is the amount
of time that the shutter is open. You can specify the polarity of the
pulse (high-going or low-going), the time delay from a trigger event
to the start of the integrate pulse, and the length of time the shutter is
open. The integrate output signal is typically used in line-scan mode.
Note that for the integrate pulse to work as programmed, you must
adjust the physical settings on your camera appropriately.
For the DT3145 frame grabber board, the integrate pulse is connected
to your camera through the camera link connector.
Interlaced Frame
A frame in which two consecutive fields of the video signal are
acquired to create a complete frame. The odd field contains lines 1, 3,
5, and so on, of the video signal. The even field contains lines 2, 4, 6,
and so on, of the video signal. One field is drawn in the first pass and
the other field is drawn in the next pass.
Inverse LUT
A look-up table in which the image is reversed. For example, for 8-bit
data, a pixel input value of 255 has an output value of 0.
63
Glossary
Line
For the DT3162 frame grabber board, the area between two
consecutive horizontal sync signals.
For the DT3145 frame grabber board, the portion of the video that is
defined by the Line_Valid signal. In line-scan mode, the portion of
the line that you want to acquire is determined by the
LineScanWidth and LineScanLeft properties. In area-scan mode, the
portion of the line that you want to acquire is determined by the
ROIWidth and ROILeft properties.
Look-up Table
A hardware feature of the device that you can use to change the value
of an incoming pixel or affect the displayed image. When the LUT
receives an input pixel value, it modifies this value according to the
corresponding value in the LUT. Also called a LUT.
The DT3162 and DT3145 frame grabber boards have two built-in
hardware look-up tables numbered 0 and 1. By default, LUT 0 is
loaded with an "identity" table and LUT 1 is loaded with an "inverse"
table. The "identity" table maps the data through unchanged. The
"inverse" table inverts the image (black becomes white and white
becomes black).
The DT3162 video circuitry generates 10-bit data values (0 to 1023).
The board uses the look-up table to convert these 10-bit values to
corresponding 8-bit values (0 to 255) that are sent to the PC. The
DT3162 look-up table has 1024 entries corresponding to all possible
10-bit input values. Each of these entries contains a number between
0 and 255, which is the 8-bit output value that is generated for the
corresponding input value.
On the DT3145 frame grabber board, it is recommended that you use
the LUTs shipped with the board and the LUTs provided with your
camera.
LUT
A look-up table.
64
Glossary
Noninterlaced Frame
A frame in which all lines (the complete frame) are acquired in a
single pass. A noninterlaced frame is also referred to as a progressive
scan.
Overlay
A means by which you can place or overlay an image on top of the
frames in your image. The overlay is always an additional (and
therefore removable) part of the frame. Anything that is drawn in the
color key that you specify is invisible (transparent); anything that is
drawn in any other color key is opaque.
Progressive Scan
A frame in which all lines (the complete frame) are acquired in a
single pass. A progressive scan is also referred to as a noninterlaced
frame.
ROI
Region of interest. An ROI is applicable in area-scan mode only.
For the DT3162 frame grabber board, an ROI is the portion of the
acquired frame that you want to store in a buffer for processing. The
top of the ROI is the first line of video relative to the active video area.
The left side of the ROI is the first pixel of video relative to the active
video area. The width of the ROI is the number of pixels per line of
video. The height of the ROI is the number of lines per frame.
For the DT3145 frame grabber board, an ROI is the portion of the
video that you want to acquire. The top of the ROI is the first line of
video, the left side of the ROI is the first pixel of video, the width of
the ROI is the number of pixels per line of video, and the height of the
ROI is the number of lines of video.
65
Glossary
Source
For the DT3162 frame grabber board, the input line on the device
through which the video signal is received. See also channel.
For the DT3162 frame grabber board, the Camera Link camera.
You can receive a video signal from only one source at a time.
Strobe Pulse
A digital output pulse generated by some devices to control an
attached strobe light. You can specify the polarity of the pulse
(high-going or low-going), the time delay from a trigger event to the
start of the pulse, and the width of the pulse.
Synchronous
A synchronous function returns control to the caller after the
operation completes.
Timeout Period
The length of time that the device driver waits from the software call
that starts an acquisition to the acquisition of the first ROI, line, or
frame of multiple lines. If an ROI/line/frame is not acquired within
this time period, the device driver generates a timeout error and
terminates the operation. Note that the timeout period always starts
with a software call, even if an external trigger is used.
66
Glossary
Total Video Area
The video image area is composed of pixels and lines of video. The
total video area is the complete set of horizontal and vertical input
lines from which you extract the active video area and the region of
interest (ROI) within the active video area that you want to acquire.
The total video area includes all parts of the signal, including
nonvisual portions such as horizontal and vertical blanking
information. (Blanking information is the data not included in the
active video area; it contains sync and other information.)
The total video area is as wide as the total pixels per line (the entire
area between two consecutive horizontal sync signals) and as tall as
the total lines per frame.
Variable-Scan Signal
A signal whose components, such as pixel clock, back porch start,
first active pixel, and total lines per field, vary depending on your
camera.
Video Input Source
For the DT3162 frame grabber board, the input line on the device
through which the video signal is received. See also channel.
For the DT3162 frame grabber board, the Camera Link camera.
You can receive a video signal from only one source at a time.
67
Glossary
68
Index
A
AcquireMem method 32, 41
AcquireType property 32, 38
acquisition properties, methods, and
events 32
active video area properties 25
ActiveDevice property 22, 37
ActiveLineCount property 26, 46
ActiveLUT property 24, 39
ActivePixelCount property 25, 46
ActiveX control, see DT-Active Frame
Grabber control
adding a DT-Active Frame Grabber
control to a project 13
B
boards, see devices
Brightness property 24, 43
C
Calibrate method 24, 42
camera control output properties 28
CameraControlOutput1 property 28,
29, 51, 52, 54, 55
CameraControlOutput2 property 51,
52, 54, 55
CameraControlOutput3 property 29,
51, 52, 54, 55
CameraControlOutput4 property 29,
51, 52, 54, 55
ClampEnd property 26, 46
ClampStart property 26, 46
CloseDevice method 22, 41
Contrast property 24, 43
conventions used 6
custom control, see DT-Active Frame
Grabber control
D
DataFormat method 24
DataFormat property 42
DeviceBusy property 23
DeviceCount property 22
devices
determining the type 22
returning the name 22
supported 11
DeviceType property 22
digital I/O properties 34
DisplayMode property 23
DrawXOrigin property 23
DrawYOrigin property 23
DT-Active Frame Grabber control 10
adding to a project 13
example program 17
E
error/status messages 36
events
acquisition 32
defined 10
overlay 27
69
Index
example program 17
expose output pulse properties 30
ExposeDelay property 30, 52
ExposeEnabled property 30, 52
ExposePolarity property 30, 52, 53
ExposePulseWidth property 30, 52
ExposeStartLine property 30, 52
ExposeStopLine property 30, 53
F
FirstActiveLine property 25, 46
FirstActivePixel property 25, 46
frame grabber boards, see devices
G
general imaging properties and
methods 22
GetBuffer method 32, 41
GetBufferCount method 32, 41
GetDC method 50
GetDeviceName method 22
H
help
online 18
HSyncInPolarity property 24, 42
HSyncOutPulseWidth property 29, 44
I
imaging properties and methods 22
input properties and methods 24
InputLineCount property 34
InputLineEventMask property 34, 56
70
installing the software 12
integrate pulse properties 31
IntegrateDelay property 31, 54
IntegrateEnabled property 31, 54
IntegratePolarity property 31, 54
IntegratePulseWidth property 31, 54
L
LineFrequency property 24, 29, 42, 44
line-scan properties 27
LineScanFrameHeight property 27, 48
LineScanFrameTriggerEnabled
property 27, 49
LineScanFrameTriggerTransition
property 27, 49
LineScanLeft property 27, 48
LineScanWidth property 27, 48
LoadConfigFile method 23
LoadConfigFile property 37
LoadLUTFromArray method 24, 39
LoadLUTFromFile method 24, 39
M
methods
acquisition 32
defined 10
general imaging 22
input 24
line-scan 27
O
OLE control, see DT-Active Frame
Grabber control
OnAcquireComplete event 32, 41
Index
OnAsyncError event 33
OnFrameComplete event 33
OnFramesComplete event 33, 41
OnInputBitsChanged event 34, 56
online help 18
OnUpdateOverlay event 28, 50
OpenDevice method 22, 37
OutputLineCount property 34
overlay properties and events 27
OverlayBitmapFile property 27, 50
OverlayColorKey property 27, 50
OverlayEnabled property 27, 50
P
PixelClockSource property 24, 37
project, adding a control 13
properties
acquisition 32
active video area 25
camera control output 28
defined 10
digital I/O 34
expose output pulse 30
general imaging 22
input 24
integrate pulse 31
line-scan 27
overlay 27
ROI 26
strobe output pulse 31
sync output 29
triggers 28
R
ReadDigitalInputPattern method 34,
56
region of interest properties 26
related documents 7
ReleaseDC method 50
removing the software 19
ROI properties 26
ROIHeight property 26, 47
ROILeft property 26, 47
ROITop property 26, 47
ROIWidth property 26, 47
S
SaveConfigFile method 23
SaveLUTToArray method 25
SaveLUTToFile method 25
service and support procedure 58
ShowPropPages method 23
software
installing 12
removing 19
status codes 36
StatusMessage property 23
StopAcquire method 32, 41
strobe output pulse properties 31
StrobeDelay property 32, 51
StrobeEnabled property 31, 51
StrobePolarity property 31, 51
StrobePulseWidth property 32, 51
StrobeStartLine property 31, 51
StrobeStopLine property 31, 51
sync output properties 29
SyncInSource property 24, 42
SyncOutEnabled property 29, 44
SyncOutPolarity property 29, 44
71
Index
T
technical support 58
TimeGranularity property 28
Timeout property 23, 37
TotalLinesPerFrame property 25, 46
TotalPixelsPerLine property 25, 46
trigger properties 28
TriggerTransition property 28, 45, 48
TriggerType property 28, 45, 48
troubleshooting checklist 58
V
VideoInputSource property 24, 42
Visual Basic 6.0, adding a control 13
Visual C++ 6.0, adding a control 14
Visual Studio .NET, adding a control
15
VSyncDelay property 30, 52
VSyncInPolarity property 24, 42
VSyncOutPulseWidth property 29, 44
W
WriteDigitalOutputPattern method
34, 56
72
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