pminimumselection

Selects regions from minimum grayscale value.

Synopsis

pminimumselection relation threshold [-m mask] [rg_in|-] [im_in|-][rg_out|-]

Description

pminimumselection selects regions from their minimum pixel value. The parameter relation specifies the order relation to the threshold value that is used to select or not a region.

The minimum value is calculated from the input image im_in and the region location is given in the input region map rg_in.

Parameters

relation is an integer from [-3,3] which specifies the order relation to the threshold value:
- relation = 3: regions with the maximum minimum value.
- relation = 2: regions >= threshold.
- relation = 1: regions > threshold.
- relation = 0: regions = threshold.
- relation = -1: regions < threshold.
- relation = -2: regions <= threshold.
- relation = -3: regions with the minimum minimum value.
threshold is an integer defined in grayscale unit.

Inputs

rg_in: a region map.
im_in: a grayscale image.

Outputs

rg_out: a region map.

Result

Returns the number of selected regions.

Examples

Selects the region(s) with the most minimum grayscale:

   pminimumselection -3 0 rin.pan a.pan rout.pan

C++ prototype

Errc PMinimumSelection( const Reg2d &rg_in, Img2duc &im_in, Reg2d &rg_out, int relation, Uchar threshold );

Version française

Sélection de régions sur leur valeur de minimum intérieur.

Author: Régis Clouard