NAME

MPSImageErode

SYNOPSIS

#import <MPSImageMorphology.h>

Inherits MPSImageDilate.

Detailed Description

The MPSImageErode filter finds the minimum pixel value in a rectangular region centered around each pixel in the source image. It is like the MPSImageAreaMin, except that the intensity at each position is calculated relative to a different value before determining which is the maximum pixel value, allowing for shaped, non-rectangular morphological probes.

for each pixel in the filter window:


    value =  pixel[filterY][filterX] + filter[filterY*filter_width+filterX]


    if( value < bestValue ){


         result = value


         bestValue = value;


    }

A filter that contains all zeros is identical to a MPSImageAreaMin filter. The center filter element is assumed to be 0, to avoid causing a general lightening of the image.

The definition of the filter for MPSImageErode is different from vImage. (MPSErode_filter_value = 1.0f-vImageErode_filter_value.) This allows MPSImageDilate and MPSImageErode to use the same filter, making open and close operators easier to write. The edgeMode property is assumed to always be MPSImageEdgeModeClamp for this filter.

Author

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