Remove image noise

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cathia
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Joined: 2012-04-08T03:08:02-07:00
Authentication code: 8675308

Remove image noise

Post by cathia » 2012-04-08T05:32:58-07:00

Hello everyone.

We have a lot of images in a folder tha contain useless information.

For instance, images may or may not have a white border.

On these white border, there may or may not have noise (random noise, hand writed notes, etc.).


I'd like to get ridd of this noise, so I can make some valuable statistics (overhall image size, contrast, etc.).


How can I achieve that?

I thought that maybe I can cut after the 1st blank line I enounter (I can assume that any line that contain only pixels as (220,220,220) or lighter is a white line). But I don't know how to do that. I even don't know where to start.

Any ideas?

Thanks a lot.

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fmw42
Posts: 25125
Joined: 2007-07-02T17:14:51-07:00
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Location: Sunnyvale, California, USA

Re: Remove image noise

Post by fmw42 » 2012-04-08T12:28:19-07:00

can you post links to a few example images and explain further what you are trying to do. Noise removal is usually done by something like -median or -morphology. Trimming excess border can usually be done by -trim.

see

http://www.imagemagick.org/script/comma ... php#median
http://www.imagemagick.org/Usage/morphology/#basic
http://www.imagemagick.org/Usage/crop/#trim

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