Adaptive Threshold and margin

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normman
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Joined: 2011-07-25T16:49:47-07:00
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Adaptive Threshold and margin

Post by normman » 2011-07-26T11:52:10-07:00

Hi,
I'm using MagickAdaptiveThresholdImage to apply an adaptive threshold on an image I have containing handwritten text. This works well for the text itself, but I'm having a problem like the one explained here(http://homepages.inf.ed.ac.uk/rbf/HIPR2/adpthrsh.htm) where the margin--that is, white space outside of the area of writing--is not uniform. In essence, most of the image should be white (the background), but instead I'm seeing this:
Image

Is there anything I can do?

I'm not really familiar with image processing, so I apologize for not knowing the correct terminology to use.

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anthony
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Joined: 2004-05-31T19:27:03-07:00
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Location: Brisbane, Australia

Re: Adaptive Threshold and margin

Post by anthony » 2011-07-26T22:06:14-07:00

You input image look like per random noise.

I am not certain just what you are trying to do. Can you give some information?
Anthony Thyssen -- Webmaster for ImageMagick Example Pages
https://imagemagick.org/Usage/

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