gray_featuresgray_featuresGrayFeaturesgray_featuresGrayFeaturesGrayFeatures (Operator)

Name

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

Signature

Description

gray_featuresgray_featuresGrayFeaturesgray_featuresGrayFeaturesGrayFeatures has a set of regions (RegionsRegionsRegionsRegionsRegionsregions) as input. For each of these regions the features (FeaturesFeaturesFeaturesFeaturesFeaturesfeatures) are calculated and returned in ValueValueValueValueValuevalue. Possble values for FeaturesFeaturesFeaturesFeaturesFeaturesfeatures:

'area'

Gray value volume of region (see area_center_grayarea_center_grayAreaCenterGrayarea_center_grayAreaCenterGrayAreaCenterGray)

'row'

Row index of the center of gravity (see area_center_grayarea_center_grayAreaCenterGrayarea_center_grayAreaCenterGrayAreaCenterGray)

'column'

Column index of the center of gravity (see area_center_grayarea_center_grayAreaCenterGrayarea_center_grayAreaCenterGrayAreaCenterGray)

'ra'

Major axis of equivallent ellipse (see elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayelliptic_axis_grayEllipticAxisGrayEllipticAxisGray)

'rb'

Minor axis of equivallent ellipse (see elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayelliptic_axis_grayEllipticAxisGrayEllipticAxisGray)

'phi'

Orientation of equivallent ellipse (see elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayelliptic_axis_grayEllipticAxisGrayEllipticAxisGray)

'min'

Minimum gray value (see min_max_graymin_max_grayMinMaxGraymin_max_grayMinMaxGrayMinMaxGray)

'max'

Maximum gray value (see min_max_graymin_max_grayMinMaxGraymin_max_grayMinMaxGrayMinMaxGray)

'mean'

Mean gray value (see intensityintensityIntensityintensityIntensityIntensity)

'deviation'

Deviation of gray values (see intensityintensityIntensityintensityIntensityIntensity)

'plane_deviation'

Deviation from the approximating plane (see plane_deviationplane_deviationPlaneDeviationplane_deviationPlaneDeviationPlaneDeviation)

'anisotropy'

Anisotropy (see entropy_grayentropy_grayEntropyGrayentropy_grayEntropyGrayEntropyGray)

'entropy'

Entropy (see entropy_grayentropy_grayEntropyGrayentropy_grayEntropyGrayEntropyGray)

'fuzzy_entropy'

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

'fuzzy_perimeter'

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

'moments_row'

Mixed moments along a row (see moments_gray_planemoments_gray_planeMomentsGrayPlanemoments_gray_planeMomentsGrayPlaneMomentsGrayPlane)

'moments_column'

Mixed moments along a column (see moments_gray_planemoments_gray_planeMomentsGrayPlanemoments_gray_planeMomentsGrayPlaneMomentsGrayPlane)

'alpha'

Approximating plane, parameter Alpha (see moments_gray_planemoments_gray_planeMomentsGrayPlanemoments_gray_planeMomentsGrayPlaneMomentsGrayPlane)

'beta'

Approximating plane, parameter Beta (see moments_gray_planemoments_gray_planeMomentsGrayPlanemoments_gray_planeMomentsGrayPlaneMomentsGrayPlane)

Attention

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

Note that the operator gray_featuresgray_featuresGrayFeaturesgray_featuresGrayFeaturesGrayFeatures only considers the given RegionsRegionsRegionsRegionsRegionsregions and ignores any previously set domain of the input image ImageImageImageImageImageimage.

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

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_featuresGrayFeaturesgray_featuresGrayFeaturesGrayFeatures 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

connectionconnectionConnectionconnectionConnectionConnection, mean_imagemean_imageMeanImagemean_imageMeanImageMeanImage, entropy_imageentropy_imageEntropyImageentropy_imageEntropyImageEntropyImage, sobel_ampsobel_ampSobelAmpsobel_ampSobelAmpSobelAmp, median_separatemedian_separateMedianSeparatemedian_separateMedianSeparateMedianSeparate

Possible Successors

select_grayselect_graySelectGrayselect_graySelectGraySelectGray, shape_transshape_transShapeTransshape_transShapeTransShapeTrans, reduce_domainreduce_domainReduceDomainreduce_domainReduceDomainReduceDomain, count_objcount_objCountObjcount_objCountObjCountObj

See also

select_grayselect_graySelectGrayselect_graySelectGraySelectGray, deviation_imagedeviation_imageDeviationImagedeviation_imageDeviationImageDeviationImage, entropy_grayentropy_grayEntropyGrayentropy_grayEntropyGrayEntropyGray, intensityintensityIntensityintensityIntensityIntensity, mean_imagemean_imageMeanImagemean_imageMeanImageMeanImage, min_max_graymin_max_grayMinMaxGraymin_max_grayMinMaxGrayMinMaxGray, select_objselect_objSelectObjselect_objSelectObjSelectObj

Module

Foundation