find local maxima and local minima

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Pat 2012-9-10

评论： Image Analyst 2017-11-22

Input=my image

how to find all the points od 2D local maxima and all points of 2D local minima of input(i,j)

please help

Mohamed Nedal 2017-11-22

For Max, you can use findpeaks() function. And for Min, it's the same function but with negative data (i.e. -x).

Image Analyst 2017-11-22

findpeaks() works only with vectors (see the help), not with 2-D arrays.

Mohamed Nedal 2017-11-22

oh, sorry I didn't know that. Thanks for correcting me.

Image Analyst 2017-11-22

You can use the functions imregionalmax() and imregionalmin() in the Image Processing Toolbox.

Image Analyst 2017-11-22

Input is the name of a built-in function so don't use that for your variable name. Try this:

localMaxImage = imregionalmax(grayImage);
localMinImage = imregionalmin(grayImage);

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