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Quick comparing two images for differences in VB.NET

Posted on 2010-09-17
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Last Modified: 2012-05-10
In VB.NET, I have a source image and a reference image that I want to compare and identify the differences. The two images are jpegs so the pixels can differ slightly while still being basically the same. I'm trying to determine how alike the two pictures are, e.g. are the 95% identical, or 10% identical etc.

I know how to loop through the image doing GetPixel() and comparing the results, but that is pretty slow for large images especially when you have to process the pixels to determine "how different" they are as opposed to just comparing them.

Does anybody have any ideas/tricks that can do this in a faster way?
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Question by:Frosty555
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Hawkvalley1 earned 2000 total points
ID: 33700667
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Expert Comment

by:c_hubbard
ID: 33702131
Why not sample a % of the pixels in the image rather than reading all of them.

How are you comparing pixels?
  You could average (Math.abs(R1-R2)+Math.abs(G1-G2)+Math.abs(B1-B2))/255//3 over all the pixels.
 
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by:Frosty555
ID: 33717380
Well that certainly sped things up to what I needed it to be at. Thank you!
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