cooc_feature_matrixcooc_feature_matrixCoocFeatureMatrixCoocFeatureMatrixcooc_feature_matrix (Operator)

Name

cooc_feature_matrixcooc_feature_matrixCoocFeatureMatrixCoocFeatureMatrixcooc_feature_matrix — Calculate gray value features from a co-occurrence matrix.

Signature

Description

The operator cooc_feature_matrixcooc_feature_matrixCoocFeatureMatrixCoocFeatureMatrixCoocFeatureMatrixcooc_feature_matrix calculates from a co-occurrence matrix (CoocMatrixCoocMatrixCoocMatrixCoocMatrixcoocMatrixcooc_matrix) the energy (EnergyEnergyEnergyEnergyenergyenergy), correlation (CorrelationCorrelationCorrelationCorrelationcorrelationcorrelation), local homogeneity (HomogeneityHomogeneityHomogeneityHomogeneityhomogeneityhomogeneity) and contrast (ContrastContrastContrastContrastcontrastcontrast).

The operator cooc_feature_matrixcooc_feature_matrixCoocFeatureMatrixCoocFeatureMatrixCoocFeatureMatrixcooc_feature_matrix calculates the gray value features from the part of the input matrix generated by gen_cooc_matrixgen_cooc_matrixGenCoocMatrixGenCoocMatrixGenCoocMatrixgen_cooc_matrix corresponding to the direction matrix indicated by the parameters LdGrayLdGrayLdGrayLdGrayldGrayld_gray and DirectionDirectionDirectionDirectiondirectiondirection according to the following formulae:

• Energy (Measure for image homogeneity):

• Correlation (Measure for gray value dependencies):

• Local homogeneity:

• Contrast (Measure for the size of the intensity differences):

where

Width of CoocMatrixCoocMatrixCoocMatrixCoocMatrixcoocMatrixcooc_matrix,

Entry of co-occurrence matrix,

,

,

,

.

Attention

The region of the input image is disregarded.

Execution Information

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Automatically parallelized on tuple level.

Parameters

Result

The operator cooc_feature_matrixcooc_feature_matrixCoocFeatureMatrixCoocFeatureMatrixCoocFeatureMatrixcooc_feature_matrix returns the value 2 (H_MSG_TRUE) if an image with defined gray values is passed and the parameters are correct. The behavior in case of empty input (no input images available) is set via the operator set_system(::'no_object_result',<Result>:)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)set_system("no_object_result",<Result>). If necessary an exception is raised.

Possible Predecessors

gen_cooc_matrixgen_cooc_matrixGenCoocMatrixGenCoocMatrixGenCoocMatrixgen_cooc_matrix

Alternatives

cooc_feature_imagecooc_feature_imageCoocFeatureImageCoocFeatureImageCoocFeatureImagecooc_feature_image

See also

intensityintensityIntensityIntensityIntensityintensity, min_max_graymin_max_grayMinMaxGrayMinMaxGrayMinMaxGraymin_max_gray, entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray, select_grayselect_graySelectGraySelectGraySelectGrayselect_gray

Module

Foundation