It's going to be hard to solve a problem that you don't understand, but to start with you almost certainly don't want to be using Otsu thresholding. I would threshold precisely on the white that is used in the digits (assuming those are what you're trying to detect).
Do you want just the average temp? If so, and it's in a fixed location, that should simplify the problem. If you want the SP1 & SP2 temps and they can be in variable places, that's going to be a little trickier and the first thing you probably want to do is to locate the registration marks and the text in the image. Tom -- You received this message because you are subscribed to the Google Groups "tesseract-ocr" group. To unsubscribe from this group and stop receiving emails from it, send an email to tesseract-ocr+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/133392f0-d8c3-4f35-8544-f874333ed353n%40googlegroups.com.
