Mirasys VMS 7.5 Spotter for Windows User Guide

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Thumbnail search allows user a very quick way to visually inspect camera material.

It is mainly meant for scenarios where some visual change in the camera view can be noticed, and user wants quickly to find the time when this change has happened.

For example, a camera that is pointed toward a large parking lot with a lot of traffic and a lot of cars. The user knows that a car was stolen from the parking lot at some point of time within the last two days. The car is visible in the material two days ago, but not visible in the latest real-time video. A motion search around the car parking place could be used, but this would show up all the motion, and would be time consuming to review. Another example could be inside a warehouse, where a box has gone missing. When exactly did it go missing?

Thumbnail search is designed to help in this scenario. To start the thumbnail search, the correct camera is added to the plugin view, and then the desired timespan is selected from the time controls.

When thumbnail search is started, it fetches thumbnails from stored video and displays them on the result view. The thumbnails are fetched based on the start and end time and selected amount of thumbnails. The default setting is 4 thumbnails, so whenever thumbnail search step is done, four thumbnails are presented. In effect, the search timespan is split into four parts and the thumbnails fetched from these

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times. If no video is available at the targeted thumbnail retrieval timepoint, plugin will search time forward until it gets a thumbnail or hits the next targeted thumbnail retrieval timepoint.

Here we have an example where one box is missing and we are trying to find the time when it has gone missing during one workday (Highlight added only for illustration purposes)

After the initial set of thumbnails is presented, the user can review which of the thumbnails show still the object of interest. In our example we can see the box is missing in the last thumbnail, still present in the third thumbnail.

So, to find out more, we double-click the third thumbnail. This will take the time between the third and fourth thumbnail, and split it again to 4 parts and fetch thumbnails.

There is a button to return to previous thumbnail search level and another button to dive deeper (same as double-click on the thumbnail)

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User can double-click and select to dive deeper into the search as many times as needed. The thumbnail fetching is very fast. It is usually easy with 5-6 selections to arrive to the time when someone is actually visible on the image. In our example, 5 steps later we arrive to the time when someone is handling the missing box. At this time we can hit play button to review the material.

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