Hi All, Currently I am trying to train 7 segment display by Tesseract, I am using the training image that has black background and white 7 segment numbers, when it comes to testing, for black background and red LED display it works just fine (relatively sharp contrast), but when I want the Tesseract to detect something like the gray digits and white background lcd display (a digital watch for instance) , the Tesseract will mistakenly take the background into part of the recognition process and the result is a mess. I know I need some pre-processing first, but I am not sure what kind of pre-processing.
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