# Region

The Region of Interest (ROI) to monitor for number plates.

Specify four comma-separated values which represent:

- The distance between the left side of the frame and the left side of the ROI.
- The distance between the top of the frame and the top of the ROI.
- The width of the ROI.
- The height of the ROI.

By default, these values are specified in pixels. To specify the values as a percentage of the video size, set `RegionUnit=percent`.

To specify a non-rectangular region of interest, set the FreeformRegion parameter instead.

Type: | Comma-separated list of integers
Default: | The entire image, unless you set FreeformRegion in which case that region is used
Required: | No
Configuration Section: | TaskName
Example: |
    Region=50,20,800,400
    RegionUnit=pixel
In this example, the top-left corner of the region of interest is 50 pixels from the left side of the frame and 20 pixels from the top of the frame. The region is 800 pixels wide and 400 pixels high.
    Region=25,0,50,100
    RegionUnit=percent
In this example, the region of interest covers the central 50% of the width of the frame, and the entire height of the frame.
See Also: | FreeformRegion RegionUnit

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