how can i got best denoisy image and which modifications are needed? (you can take any grayimage for testing)

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vipul utsav 2013-2-4

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https://ww2.mathworks.cn/matlabcentral/answers/62128-how-can-i-got-best-denoisy-image-and-which-modifications-are-needed-you-can-take-any-grayimage-for

i added noise using n=0+40*randn(size(grayimage)) in grayimage(noisy=grayimage+n). then i have removed noise using medfilt2(noisy, [3 3]); but i have not got best result, so how can i got best denoisy image and which modifications are needed? (you can take any grayimage for testing)

[medfilt2(noisy, [3 3]) works well for salt & pepper noise.]

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Image Analyst 2013-2-4

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There are a number of noise reduction methods that are better than median filter. Some of the more famous ones include BM3D, non-local means, K-SVD, K-LLD, UINTA, etc. Other simpler, less sophisticated methods include sigma filters, bilateral filters, mean shift, etc. Try them all! Some are even available in the File Exchange.