H-maxima transform

{{one source |date=April 2024}}

In mathematical morphology, the h-maxima transform is a morphological operation used to filter local maxima of an image based on local contrast information. First, all local maxima are defined as connected pixels in a given neighborhood with intensity level greater than pixels outside the neighborhood. Second, all local maxima that have height $f$ lower or equal to a given threshold are suppressed. The height f of the remaining maxima is decreased by $h$.

The h-maxima transform is defined as the reconstruction by dilation of $f$ from $f-h$:

: $\backslash operatorname\{HMAX\}\_h(f)=R\_f^\backslash delta(f-h)$