Getting time from image

[Ashwan Reddy]

Hi,

I'm trying to extract "8:56" from this image, which is cropped from a portion of a basketball broadcast. This command returns "757" using Tesseract 3.05, which is not the result I'm hoping for:

tesseract myimage.jpg -c tessedit_char_whitelist=0123456789:. -c tessedit_write_images=1 -psm 7 stdout

I've attached the tessinput image, which shows that the pre-processing steps basically remove the time entirely. Cropping the image to fit just the text area is not an option for my purposes unfortunately. Any ideas on how I could improve the result otherwise?

Thanks!

Ashwan

[Adrian Owen]

HI Ashwan,

 

Gimp is your friend: https://stackoverflow.com/questions/9480013/image-processing-to-improve-tesseract-ocr-accuracy

 

If your programming, use KalikoImage library to replicate manual GIMP steps, that’s easy.

 

I found greyscale didn’t help.

YES: Long line removal (may not apply to you) (OpenCV)

YES: resize to 300DPI

YES: Apply filters

 

Hope this helps, Adrian

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[Ashwan Reddy]

Thanks for the suggestions, Adrian. I'll give those a try.

Ashwan

[Soumik Ranjan Dasgupta]

As an alternative, you could try using the version 4 provided the image size is appropriate. I have used version 4 on raw images like these and the results came out unexpectedly well.

To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/ec980b11-5b26-48df-892c-2f9a28b178a2%40googlegroups.com.

For more options, visit https://groups.google.com/d/optout.

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Regards,

Soumik Ranjan Dasgupta