Circular patch using COLFILT?
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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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Antworten (2)
Sean de Wolski
am 4 Nov. 2013
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))
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Image Analyst
am 4 Nov. 2013
To do that, (max-min), it looks like you can use rangefilt().
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Sean de Wolski
am 4 Nov. 2013
Yeah, actually:
F = floor(rangefilt(I,getnhood(strel('disk',r)))./r)
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