Need help understanding imextendedmax

Hello,

Im using this function to identify the peaks/maximum centroids in a 2d matrix normalized between 0 and 1.

I need help understanding how to properly select the second input, called h-max in the documentation.

Say there are three peaks, or areas of interest in my matrix, each with its own maximum. Sometimes, the difference in values between peaks are large, for example, 0.4 between the largest and the smallest. I thought I would capture the areas of interest if I then allow h-max to be a little less than 0.6. However, it only captures the three areas if it is much lower, say 0.2.

Can anyone explain how this works? And if you have some suggestions as to how to choose h-max?

Any help is appreciated.

link to function: https://se.mathworks.com/help/images/ref/imextendedmax.html#buo1zpa-1-H

Kind regards

Knut