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Circular patch using COLFILT?

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Faraz
Faraz 2013-11-4
评论： Sean de Wolski 2013-11-4
Hi there,
COLFILT operates a function on a matrix/image within a rectangular patch of [m n]. Instead of a rectangular one; I want my function to operate within a circular disc/mask. Is there a way to do it?
Example:
r = 5; % a certain length
rc = @(x) floor(((max(x)-min(x))/r))+ 1; % a non-linear filter
F= colfilt(I, [r r],'sliding', rc); % I is my 2D matrix/image
Query: Here, if I want to have a disk of radius r, instead of a rectangle [r r], how I do that?

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回答（2 个）

Sean de Wolski
Sean de Wolski 2013-11-4
Inside of your anonymous function, you could use logical indexing to only apply the operation to the circular part of the rectangular. As for generating the circle, an easy way:
M = getnhood(strel('disk',r))
Image Analyst
Image Analyst 2013-11-4
To do that, (max-min), it looks like you can use rangefilt().

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