Noise Estimation / Noise Measurement in Image

Posted by Drazick on Stack Overflow See other posts from Stack Overflow or by Drazick
Published on 2010-03-13T23:32:01Z Indexed on 2010/03/13 23:35 UTC
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estimation

Hello. I want to estimate the noise in an image.

Let's assume the model of an Image + White Noise. Now I want to estimate the Noise Variance.

My method is to calculate the Local Variance (3*3 up to 21*21 Blocks) of the image and then find areas where the Local Variance is fairly constant (By calculating the Local Variance of the Local Variance Matrix). I assume those areas are "Flat" hence the Variance is almost "Pure" noise.

Yet I don't get constant results.

Is there a better way?

Thanks.

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