tesseract not recognize one number image

Question

i am using tesseract with python. It recognizes almost all of my images with 2 or more numbers or characteres. But tesseract can't recognizes image with only one number. I tried to use the command line, and it's giving me "empty page" as response.

I don't want to train tesseract with "only digits" because i am recognizing characters too.

What is the problem?

Below the image that its not recognized by tesseract.

Code:

 #getPng(pathImg, '3') -> creates the path to the figure.
 pytesseract.image_to_string( Image.open(getPng(pathImg, '3')) 

Answer 1

If you add the parameter --psm 13 it should works, because it will consider it as a raw text line, without searching for pages and paragraphs.

So try:

pytesseract.image_to_string(PATH, config="--psm 13") 

Answer 2

Try converting image into gray-scale and then to binary image, then most probably it will read. If not duplicate the image , then you have 2 letters to read. So simply you can extract single letter