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Remove Noise from binary image.

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Zaheer Abbas
Zaheer Abbas 2017-3-7
评论： Anika Paulsen 2017-3-13
I have to work on this image
When I convert this image into a binary image, I got noisy image like this:
Which pre-processing techniques should I need to apply on this? I need braille dots as white dots and remaining background black in binary image. Please help, I am a newbie.
  2 个评论
Jan
Jan 2017-3-7
An interesting problem. On the upper left of the image, I can recognize the dark shadows under the points only, and on the bottom I see the light on the upside of the point and shadow on the bottomside. Therefore I assume different techniques have to be combined. I had equivalent problems with a irregularily illuminated picture containing standard text and very curious about the answers.

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