Remove noise from the image
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I have a image of a coin I wanted to make a circular mask to remove noise [Attached mat]
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1007955/image.png)
I tried using imfindcircle but it is not working properly
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Bjorn Gustavsson
2022년 5월 23일
First start by trying standard filtering-methods. Compare what you get with 2-D median-filter (medfilt2), and Lee's sigma-filter (wiener2) and see how they perform. After doing that you can check different more advanced image-filters on the file-exchange, for example: bilateral filters, Nonlinear Diffusion filters, total variation filtering and on and on. But first use the basic tools then understand their use and the noise-characteristics in your image. Check the help and documentation to medfilt2 and wiener2.
HTH
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Bjorn Gustavsson
2022년 5월 23일
Yes they do, you might have to take further steps after that. Clearly your image have very peculiar non-uniform illumination that you'll also have to correct for.
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