find local maxima and local minima

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

Answer 1

[Mohamed Nedal]

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

[Image Analyst]

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

[Mohamed Nedal]

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

Answer 2

[Image Analyst]

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

[Image Analyst]

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);