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Extract writing from colorful background

asked 2017-01-18 07:20:37 -0600

Atado gravatar image

updated 2017-01-18 07:29:34 -0600

Hey, im trying to extract a handwritten sum from a colorful background. So as a result i'd like to have a binary image with the sum black and the colorful background should be all filtered out and set to white.

The image looks like this: image description

I tried various treshholds, grabcut, color filters and morphologic operations to improve quality but i cant get a decent result.

I could maybe filter for "only" black in HSV color space, but in other images the sum might be written in blue. Maybe someone knows how to get the best possible result here.

Best regards

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answered 2017-01-18 15:35:46 -0600

LBerger gravatar image

3 steps :

  1. Gaussian blur(11,11) with sigma=5
  2. convert to gray
  3. Automatic threshold using OTSU

results are :

image description

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Thats a nice result, thank you!

Atado gravatar imageAtado ( 2017-01-19 01:15:27 -0600 )edit

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Asked: 2017-01-18 07:20:37 -0600

Seen: 298 times

Last updated: Jan 18 '17