You can configure the grid of a scene so that changes in the scene can be properly detected and analyzed.
What you should know
- Object detection and Stopped vehicle detection scenarios only use perspective grids.
- Custom Object Detector scenarios can use fixed grids or perspective
Fixed grids are used for top-down scenes, where there is no horizon, for example, the top view of a parking lot.
NOTE: Depending on which scenario type you are configuring, some settings might be unavailable or hidden if Advanced mode is disabled.
- From the Config Tool home page, open the Video task.
- From the area view, select a camera that you applied an analytics scenario to.
- Click , and then click the scenario you want to configure.
Click the Grid tab.
For a perspective grid, use one object in the video as a size reference to
configure the near and far objects:
- When the reference object is placed near to the camera, click and drag the Near object over the reference object in the video.
- Adjust the height of the Near object to match the height of the reference object by clicking and dragging the white dot on the Near object.
- Repeat the previous two steps using the Far object when the same reference object is placed far from the camera.
- For a fixed grid, adjust the height of the Object to match the height of a reference object by clicking and dragging the white dot on the Object.
In the Grid section, configure the following
NOTE: Changing the block size affects the size of the blocks displayed when you enable the Show detection grid option in the area configuration.
- Block size
- The size of analysis units relative to the specified object or person size in the image. If you set a low value, the required computing power increases, but the distinction between different object sizes in the image is more accurate.
- Min. block size
- The minimum size of analysis units relative to the height or width of the video, depending on which measurement is shorter.
- Click Apply.