penergyselection

Selects regions from energy value.

Synopsis

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

Description

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

Energy is measure as follows:

   energy = SUM { im_in[p] * im_in[p]} / N

Parameters

relation is an integer from [-3,3] which specifies the order relation to the threshold value:
- relation = 3: regions with the 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 value.
threshold is a float value.

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 regions with the highest energy:

   penergyselection 3 0 rin.pan a.pan rout.pan

C++ prototype

Errc PEnergySelection(const Reg2d &rg_in, Img2duc &im_in, Reg2d &rg_out, int relation, float threshold );

Version française

Sélection de régions sur leur valeur d'énergie intérieure.

Author: Régis Clouard