HISTIDIFFERENCE - Inverse difference feature derived from (co)occurrence matrices.

Contents

Description
Syntax
References
See also
Function implementation

Description

Calculate the inverse difference feature defined in [HSD73] from (co)occurrence matrices.

This feature measures the local inverse difference D in an image as [ST99]:

GLCM case - with $P_{ij}$ the joint probability of the greylevel pair : $D = \sum_{i,j} \frac{P_{ij}}{(1+|i-j|)}$

GLSDV case - with the probability of the greylevel difference : $D = \sum_d \frac{P_d}{(1+|d|)}$

Syntax

   D = HISTIDIFFERENCE(Pd, d);
   D = HISTIDIFFERENCE(Pij, i, j);

References

See HISTCONTRAST.

See also

Ressembles: HISTCONTRAST, HISTENERGY, HISTHOMOGENEITY, HISTVARIANCE, HISTENTROPY2, HISTENTROPY10, HISTMAXIMUM, HISTMEAN, HISTDISSIMILARITY, HISTCORRELATION, LOCALGLCM2D, LOCALGLOV2D, LOCALGLSDV2D.

Function implementation

function D = histidifference(pIJ,I,varargin)
D = I;
if nargin>2
    D = D - varargin{1};
end;

D = 1 + abs(D);
D = sum (pIJ(:) ./ D(:));

end % end of histidifference