Good luck, and please let us know what you come up with. If these are the only scenarios, white-on-black is always solid background, and black-on-color is always seven-segment-display, then you're done. If not, I suspect you could look at image color histograms to at least figure out whether your text is white-on-black or black-on-color. 104-character fonts, a hexadecimal font for 7-segment displays, multiplex scan circuitry, anode and cathode drivers, and static RAM that stores each digit.

If you have metadata telling you what sort of display you're dealing with, great. 7 Segment Font is a display and digital typeface that is the best choice for large display formats on any digital screens. The hard part then becomes knowing which preprocessing task to do. There you can download the trained data for 7 segments font and a python script with some pre-process capabilities. An easy first pass might be to do a small-radius gaussian blur, threshold at a pretty low value (you're trying to keep only black, so 15% seems right), and then invert the image. Using some image manipulation tool (I happen to like imagemagick), you need to make the images more to tesseract's satisfaction. It is not very smart about how to do this. If you give it something that isn't that, it will do its best to convert it to that format. Tesseract would really prefer its images to all be white-on-black text in bitmap format. This seems like an image preprocessing task. Digital Font OLED - Seven Segment Display Using Arduino Displays jabmel July 10, 2020, 8:43am 1 Hi Team, where do I find a Digital font for OLED - BUT - Not an Adafruit library many thanks I have done some searches on here and the web, it is proving difficult.

7 segment display fonts