Actually, megapixels don't matter so much. Images with low resolution (e.g. 1 mpix) can be recognized rather well. Most important here is that camera should have autofocus and image is not blurred.
You might also find tips listed here useful for getting better results.
answered 22 Jul '12, 16:15
Vasily Panferov ♦♦
There are also some more articles on Camera OCR
Image Resolution Detection can be an issue for OCR - but ABBYY SDKs try the best to get it right ;o)
Correct image preprocessing is also very important to get the optimal recognition results
Note: these URLs point to articles written for the ABBYY SDKs (FineReader Engine & FlexiCapture Engine), but the core technology is also used in the Cloud OCR SDK backend.
answered 04 Apr '13, 18:35