Move to Otsu's method for image binarization in the OCR code
Move to Otsu's method for image binarization in the OCR code

Rename variables in ocr.cpp to avoid shadowing global functions in std

Add code for debugging to the OCR routine

dpearson/license-plate-recognition,dpearson/license-plate-recognition,dpearson/license-plate-recognition,dpearson/license-plate-recognition