For OCR

OCR Libraries

1. Tesseract

   Turned out to be bad on low contrast images in initial testing.

2. MMOCR
   It was able to detect the text fields, though it was not able to detect the text correctly.

   

Cloud Services

1. Google Vision API

   Tested on 10 test images: 3 mis-interpretated letters and 1 mis-detected field.

   

2. OCR.Space

   

3. Azure Vision API

• Azure API documentation
• Paid tier has a limit of 30 requests /s . Source