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ocrtesseract

Tesseract can't recognize simple numbers

enter image description here

$ tesseract pin3.png output
$ cat output.txt


bon 9 no Us

(oe


// expect 

391 
205
786
 4

I think the image is not complicated, but tesseract doesn't recognize the numbers of image. I thought perhaps number's colors are white, so I tried to change number color to black but result is same. How can I make tesseract recognize that kinds of image?

Thanks

-- As you can see, This is not single word

Solution

  • Preprocess image:

    1. invert
    2. binarize

    enter image description here

    tesseract numpad_.png - --psm 6
Warning: Invalid resolution 0 dpi. Using 70 instead.
3 9 1
2 0 5
7 8 6

4