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The LPR camera has the ability to customize the area that is being analyzed during the plate read. This article explains how to adjust the read area (Bounding Box). 

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Adjusting the Bounding Box

The bounding box refers to the area that can be adjusted to narrow the view or area that is analyzed by the LPR camera. 

The settings involved are located in the Plate Reader Settings.


The default settings for full frame are as follows. Measurements for height are always considered the distance from the top of the screen. Measurements for width are based on distance from the left of the screen

Win MinX Pixel - 0 (from the top)
Win MinY Pixel - 0 (From the left)
Win MaxX Pixel - 1279 (from the top)
Win MaxY Pixel - 1023 (From the left)

To view the location of the bounding box go into the Camera OCR tab.


Here is the full frame view of the bounding box. See the red outlined box in the image below.

Adjusting Height

To adjust the box edit the number in the settings. In this case we will narrow the bounding box in height to restrict the read area.

Here are the settings

Win MinX Pixel - 0 (from the top)
Win MinY Pixel - 100 (From the left)
Win MaxX Pixel - 1279 (from the top)
Win MaxY Pixel - 700 (From the left)

The resulting Bounding Box will look like this:

Let's now say we want to lower the box in the view. I would have to increase the values in both Y axis settings.

Here are the settings

Win MinX Pixel - 0 (from the top)
Win MinY Pixel - 200 (From the left)
Win MaxX Pixel - 1279 (from the top)
Win MaxY Pixel - 800 (From the left)

Here is the resulting bounding box:

Adjusting Width

Additionally you can narrow the width of the bounding box if need be. In this case we will narrow the bounding box by 100 pixels on both sides.

Here are the settings

Win MinX Pixel - 100 (from the top)
Win MinY Pixel - 200 (From the left)
Win MaxX Pixel - 1179 (from the top)
Win MaxY Pixel - 800 (From the left)



Here is the resulting bounding box.

By selective use of these settings you can customize the area that is processed by the LPR read. As a result read LPR reads could be faster and more accurate since the camera is reading a smaller more focused area and ignores anything outside of the bounding box.



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