gray_featuresgray_featuresGrayFeaturesGrayFeatures (Operator)

Name

gray_featuresgray_featuresGrayFeaturesGrayFeatures — Calculates gray value features for a set of regions.

Signature

Description

gray_featuresgray_featuresGrayFeaturesGrayFeaturesGrayFeatures has a set of regions (RegionsRegionsRegionsRegionsregions) as input. For each of these regions the features (FeaturesFeaturesFeaturesFeaturesfeatures) are calculated and returned in ValueValueValueValuevalue. Possble values for FeaturesFeaturesFeaturesFeaturesfeatures:

'area'

Gray value volume of region (see area_center_grayarea_center_grayAreaCenterGrayAreaCenterGrayAreaCenterGray)

'row'

Row index of the center of gravity (see area_center_grayarea_center_grayAreaCenterGrayAreaCenterGrayAreaCenterGray)

'column'

Column index of the center of gravity (see area_center_grayarea_center_grayAreaCenterGrayAreaCenterGrayAreaCenterGray)

'ra'

Major axis of equivallent ellipse (see elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayEllipticAxisGrayEllipticAxisGray)

'rb'

Minor axis of equivallent ellipse (see elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayEllipticAxisGrayEllipticAxisGray)

'phi'

Orientation of equivallent ellipse (see elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayEllipticAxisGrayEllipticAxisGray)

'min'

Minimum gray value (see min_max_graymin_max_grayMinMaxGrayMinMaxGrayMinMaxGray)

'max'

Maximum gray value (see min_max_graymin_max_grayMinMaxGrayMinMaxGrayMinMaxGray)

'median'

Median gray value (see min_max_graymin_max_grayMinMaxGrayMinMaxGrayMinMaxGray, with Percent=50)

'mean'

Mean gray value (see intensityintensityIntensityIntensityIntensity)

'deviation'

Deviation of gray values (see intensityintensityIntensityIntensityIntensity)

'plane_deviation'

Deviation from the approximating plane (see plane_deviationplane_deviationPlaneDeviationPlaneDeviationPlaneDeviation)

'anisotropy'

Anisotropy (see entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGray)

'entropy'

Entropy (see entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGray)

'fuzzy_entropy'

Fuzzy entropie of region (see fuzzy_entropyfuzzy_entropyFuzzyEntropyFuzzyEntropyFuzzyEntropy, with a fuzzy function from Apar=0 to Cpar=255)

'fuzzy_perimeter'

Fuzzy perimeter of region (see fuzzy_perimeterfuzzy_perimeterFuzzyPerimeterFuzzyPerimeterFuzzyPerimeter, with a fuzzy function from Apar=0 to Cpar=255)

'moments_row'

Mixed moments along a row (see moments_gray_planemoments_gray_planeMomentsGrayPlaneMomentsGrayPlaneMomentsGrayPlane)

'moments_column'

Mixed moments along a column (see moments_gray_planemoments_gray_planeMomentsGrayPlaneMomentsGrayPlaneMomentsGrayPlane)

'alpha'

Approximating plane, parameter Alpha (see moments_gray_planemoments_gray_planeMomentsGrayPlaneMomentsGrayPlaneMomentsGrayPlane)

'beta'

Approximating plane, parameter Beta (see moments_gray_planemoments_gray_planeMomentsGrayPlaneMomentsGrayPlaneMomentsGrayPlane)

Attention

Several features are processed in the order in which they are entered.

Note that the operator gray_featuresgray_featuresGrayFeaturesGrayFeaturesGrayFeatures only considers the given RegionsRegionsRegionsRegionsregions and ignores any previously set domain of the input image ImageImageImageImageimage.

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

Complexity

If F is the area of the region and N the number of features the runtime complexity is O(F * N).

Result

The operator gray_featuresgray_featuresGrayFeaturesGrayFeaturesGrayFeatures returns the value 2 (H_MSG_TRUE) if the input image has the defined gray values and the parameters are correct. If necessary an exception is raised.

Possible Predecessors

connectionconnectionConnectionConnectionConnection, mean_imagemean_imageMeanImageMeanImageMeanImage, entropy_imageentropy_imageEntropyImageEntropyImageEntropyImage, sobel_ampsobel_ampSobelAmpSobelAmpSobelAmp, median_separatemedian_separateMedianSeparateMedianSeparateMedianSeparate

Possible Successors

select_grayselect_graySelectGraySelectGraySelectGray, shape_transshape_transShapeTransShapeTransShapeTrans, reduce_domainreduce_domainReduceDomainReduceDomainReduceDomain, count_objcount_objCountObjCountObjCountObj

See also

select_grayselect_graySelectGraySelectGraySelectGray, deviation_imagedeviation_imageDeviationImageDeviationImageDeviationImage, entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGray, intensityintensityIntensityIntensityIntensity, mean_imagemean_imageMeanImageMeanImageMeanImage, min_max_graymin_max_grayMinMaxGrayMinMaxGrayMinMaxGray, select_objselect_objSelectObjSelectObjSelectObj

Module

Foundation