matlabimage-processingregionindices
Get outer indecies of a region in a logical image
If I've any m x n logical image of a white region like the following:
How to get the indices of the boundary line between the white and black regions?
Solution
This simply comes down to detecting the edges of the given image. MATLAB already has a built-in implementation for that in the edge command. Here's an example of detecting the boundaries of an image I using the Canny filter:
A = edge(I, 'canny');
The non-zero elements in the resulting image A are what you're after. You can then use find to obtain their indices.
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