Tesseract does not recognize single characters

Question

How to represent:

1. Create new image with paint (any size)
2. Add letter A to this image
3. Try to recognize -> tesseract will not find any letters

Answer 1

Have you seen this?

https://code.google.com/p/tesseract-ocr/issues/detail?id=581

The bug list shows it as "no longer an issue".

• Be sure to have high resolution images.
• If you are resizing the image, be sure to keep a high DPI and don't resize too small
• Be sure to train your tesseract system
• use the baseApi.setVariable("tessedit_char_whitelist", "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"); code before the init Tesseract
• Also, you may look into which font to use with OCR