pmaximumselection

Selects regions from maximum grayscale value.

Synopsis

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

Description

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

The maximum 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 maximum 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 maximum 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

Select regions with the maximum value > 50:

   pmaximumselection 1 50 rin.pan a.pan rout.pan

C++ prototype

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

Version française

Sélection de régions sur leur valeur de maximum intérieur.

Author: Régis Clouard