MATLAB: Find local minima in greyscale image

Computer Vision Toolboxdigital image processingImage Processing Toolboximage segmentationwatershed

Hi, I have a set of greyscale images where I need to find the local minima (example attached), and my idea is to approach the problem using the watershed method. If I apply it directly to the greyscale image I have oversampling issues, and I haven't found any example dealing with a similar problem. Do you have any suggestion on how to proceed? Thanks!

Best Answer

check imregionalmin() and imregionalmax()

Alternatively you can check detectmserfeatures() if you are looking for regions.

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MATLAB: Finding minima

If you want fancy, take Walter's advice and search FEx. If you want quick and dirty:

x = 1:50;
y = sin(5*x);
idx = [false, y(3:end)>y(2:end-1) & y(2:end-1)<y(1:end-2), false];
xmin = x(idx)
plot(x,y,'o-',xmin,y(idx),'rx')

MATLAB: Determining Minima of improfile

You can use a function called imregionalmin().

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MATLAB: Finding minima

MATLAB: Determining Minima of improfile

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