[Solved] How can I apply a ring-shaped median filter to an image in matlab? [closed]

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you can use ordfilt2 .

For example, if your “ring” is just defined by: 

ring= fspecial('gaussian',21,1)
ring = ring>eps & ring<1e-9

enter image description here

then:

order=sum(ring(:))/2;
B = ordfilt2(A,order,ring);

replaces each element in A by the order-th element in the sorted set of neighbors specified by the nonzero elements in the ring domain.
Here I chose ‘order’ to be half the total # of the pixels in the ring.

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solved How can I apply a ring-shaped median filter to an image in matlab? [closed]