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Edge detection only in a region of an image

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Efstathios Kontolatis
Efstathios Kontolatis on 12 Jan 2017
Answered: Vishal Neelagiri on 17 Jan 2017
I have an image and I want to make edge detection only on a region of this. In order to do so I have created a complex polygon using roipoly. Does anyone know how to perform edge detection on this region now? Thank you very much in advance

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Answers (1)

Vishal Neelagiri
Vishal Neelagiri on 17 Jan 2017
You can use the 'edge' function to detect the edges in an image. You can also use this on the output of the 'roipoly' function. For example:
I = imread('eight.tif');
c = [222 272 300 270 221 194];
r = [21 21 75 121 121 75];
BW = roipoly(I,c,r);
figure, imshow(I)
figure, imshow(BW)
edge(BW)
You can refer to the following documentation links:
https://www.mathworks.com/help/images/ref/roipoly.html#f6-163815
https://www.mathworks.com/help/images/ref/edge.html

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