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find noise from histogram

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Elysi Cochin
Elysi Cochin 2014-6-3
回答： Image Analyst 2014-6-3
sir the images in the link below are the histograms i got... i want to find whether any kind of noise exist...
As per the link in
http://www.mathworks.in/matlabcentral/answers/131873-how-to-know-whether-noise-in-a-image
it tells that "If there is no noise it should be a big spike at zero"
please can anyone tell me why there are 2 spikes, one spike at zero and one spike at 1, as shown in the link below.... what does that mean?... please do reply....
http://oi57.tinypic.com/2dklv5t.jpg

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Image Analyst
Image Analyst 2014-6-3
Did you cast the images to double before you subtracted them? You need to. If you did that and you get spikes at 0 and 1 then that means there are a bunch of pixels that are the same in the two images and there are a bunch that differ by only 1 gray level.

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