gen_cooc_matrixgen_cooc_matrixgen_cooc_matrixGenCoocMatrixGenCoocMatrix (Operator)

Name

gen_cooc_matrixgen_cooc_matrixgen_cooc_matrixGenCoocMatrixGenCoocMatrix — Calculate the co-occurrence matrix of a region in an image.

Signature

Description

The operator gen_cooc_matrixgen_cooc_matrixgen_cooc_matrixGenCoocMatrixGenCoocMatrix determines from the input regions how often the gray values i and j are located next to each other in a certain direction (0, 45, 90, 135 degrees), stores this number in the co-occurrence matrix at the locations (i,j) and (j,i) (the matrix is symmetrical), and finally scales the matrix with the number of entries. LdGrayLdGrayLdGrayLdGrayldGray indicates the number of gray values to be distinguished (namely 2^LdGray).

Example: Input image with gray values     0 0 3
         (scaled with LdGray=2)           1 1 2
                                          1 2 3

        Co-occurrence matrix (not scaled):

                2 0 0 1          0 1 1 0
            0:  0 2 2 0    135:  1 0 1 1
                0 2 0 1          1 1 0 0
                1 0 1 0          0 1 0 0

                0 2 0 0          0 1 0 0
           90:  2 2 1 0     45:  1 2 0 1
                0 1 0 2          0 0 2 0
                0 0 2 0          0 1 0 0
 

Parallelization

• 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 gen_cooc_matrixgen_cooc_matrixgen_cooc_matrixGenCoocMatrixGenCoocMatrix returns the value 2 (H_MSG_TRUE) if an image with defined gray values is entered 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>)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>), the behavior in case of empty region is set via set_system(::'empty_region_result',<Result>:)set_system("empty_region_result",<Result>)set_system("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>). If necessary an exception is raised.

Possible Predecessors

draw_regiondraw_regiondraw_regionDrawRegionDrawRegion, gen_circlegen_circlegen_circleGenCircleGenCircle, gen_ellipsegen_ellipsegen_ellipseGenEllipseGenEllipse, gen_rectangle1gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1, gen_rectangle2gen_rectangle2gen_rectangle2GenRectangle2GenRectangle2, thresholdthresholdthresholdThresholdThreshold, erosion_circleerosion_circleerosion_circleErosionCircleErosionCircle, binomial_filterbinomial_filterbinomial_filterBinomialFilterBinomialFilter, gauss_imagegauss_imagegauss_imageGaussImageGaussImage, smooth_imagesmooth_imagesmooth_imageSmoothImageSmoothImage, sub_imagesub_imagesub_imageSubImageSubImage

Alternatives

cooc_feature_imagecooc_feature_imagecooc_feature_imageCoocFeatureImageCoocFeatureImage

See also

cooc_feature_matrixcooc_feature_matrixcooc_feature_matrixCoocFeatureMatrixCoocFeatureMatrix

Module

Foundation