Removing Non uniformity of color from backlight lcd

[FraggerFox]

I have a cluster display having backlight LCD from where I need to grab text using OCR. However, since the LCD backlight comes from the center corner, there is non-uniformity of background color since light is not uniformly distributed over the whole LCD. What are the options I need to consider to process the LCD backlight image to make it look like its uniformly illuminated?

[Andrey_Dmitriev · Accepted solution]

If backlight conditions aren't changed from image to image, then take an image where all segments are turned off, store this reference image, then simply subtract it from actual image (the easiest way to do this - with SGL type if performance permit) - then your non uniformity goes away.