How can I estimate the variance of noise of an given image?

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shimul
shimul 2013-10-4
评论： Image Analyst 2019-11-15
An input image is given, I am supposed to estimate the variance of noise of that image.

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Image Analyst
Image Analyst 2013-10-4
Try running various filters on your image until you think you've achieved a noise free image. Then subtract it from the noisy image and pass the result in to var(). Make sure you cast your images to double because a subtraction of uint8 pixel values will clip at 0 and not give you the negative values that you need.
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DM
DM 2019-11-13
hello, image analyst. Do you know how to find the variance of multiple images?

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