ipConfigure ESM 5.1
LPR Setup and Field Installation Guide
16
13. : Click on this box to start to draw your LPR reference window, this is the
larger Red rectangle you see in the Configuration Area of Live View section.
Remember this must be 200 pixels wide for best results. If it is not 200 pixels on
the native image, you need to look at zooming in more on the FOV and
refocusing.
14. UL: Upper Left coordinates of plate detection window. The detection window is
reference only for the system and it is not necessary to be in the exact location
that a plate will be found.
15. UR: Upper Right coordinates of plate detection window. The detection window is
reference only for the system and it is not necessary to be in the exact location
that a plate will be found.
16. LL: Lower Left coordinates of plate detection window. The detection window is
reference only for the system and it is not necessary to be in the exact location
that a plate will be found.
17. LR: Lower Right coordinates of plate detection window. The detection window is
reference only for the system and it is not necessary to be in the exact location
that a plate will be found.
18. Motion Skew: optimal setting is 0. The LPR engine contains automatic motion
skew correction and this value can be used to override this but is rarely
necessary.
19. Kernel Size: optimal setting is 31. This is the size of the convolution kernel used
to enhance the plate image. The default of 31 is optimal for most conditions and
should not be changed.
20. Threshold: optimal setting is 125. This is the pixel color level threshold used to
increase contrast between dark and light colors. The default of 125 is optimal
and the LPR engine will automatically adjust this value internally pursuant to
ambient light conditions.
21. Reference Plate: This is the width and height of the plate detection window
respectively.
22. OCR: This is the training file set that the OCR engine should use to recognize the
plate numbers and letters. These files exist in the LPRConfig subdirectory and
are typically named “plate.*”, “texas.*”, etc.
23. High Conf Min: This determines the minimum number of characters that must be
found for the LPR Engine to return as a possible plate. This includes the space
in the middle of the character set. If there is a plate read under this value, it will
not be recorded. Ideal setting is 5.
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