gray_featuresgray_featuresGrayFeaturesGrayFeaturesgray_features (Operator)

Name

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

Signature

Description

gray_featuresgray_featuresGrayFeaturesGrayFeaturesGrayFeaturesgray_features has a set of regions (RegionsRegionsRegionsRegionsregionsregions) as input. For each of these regions the features (FeaturesFeaturesFeaturesFeaturesfeaturesfeatures) are calculated and returned in ValueValueValueValuevaluevalue. Possible values for FeaturesFeaturesFeaturesFeaturesfeaturesfeatures:

'area'

Gray value volume of region (see area_center_grayarea_center_grayAreaCenterGrayAreaCenterGrayAreaCenterGrayarea_center_gray)

'row'

Row index of the center of gravity (see area_center_grayarea_center_grayAreaCenterGrayAreaCenterGrayAreaCenterGrayarea_center_gray)

'column'

Column index of the center of gravity (see area_center_grayarea_center_grayAreaCenterGrayAreaCenterGrayAreaCenterGrayarea_center_gray)

'ra'

Major axis of equivalent ellipse (see elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayEllipticAxisGrayEllipticAxisGrayelliptic_axis_gray)

'rb'

Minor axis of equivalent ellipse (see elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayEllipticAxisGrayEllipticAxisGrayelliptic_axis_gray)

'phi'

Orientation of equivalent ellipse (see elliptic_axis_grayelliptic_axis_grayEllipticAxisGrayEllipticAxisGrayEllipticAxisGrayelliptic_axis_gray)

'min'

Minimum gray value (see min_max_graymin_max_grayMinMaxGrayMinMaxGrayMinMaxGraymin_max_gray)

'max'

Maximum gray value (see min_max_graymin_max_grayMinMaxGrayMinMaxGrayMinMaxGraymin_max_gray)

'median'

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

'mean'

Mean gray value (see intensityintensityIntensityIntensityIntensityintensity)

'deviation'

Deviation of gray values (see intensityintensityIntensityIntensityIntensityintensity)

'plane_deviation'

Deviation from the approximating plane (see plane_deviationplane_deviationPlaneDeviationPlaneDeviationPlaneDeviationplane_deviation)

'anisotropy'

Anisotropy (see entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray)

'entropy'

Entropy (see entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray)

'fuzzy_entropy'

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

'fuzzy_perimeter'

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

'moments_row'

Mixed moments along a row (see moments_gray_planemoments_gray_planeMomentsGrayPlaneMomentsGrayPlaneMomentsGrayPlanemoments_gray_plane)

'moments_column'

Mixed moments along a column (see moments_gray_planemoments_gray_planeMomentsGrayPlaneMomentsGrayPlaneMomentsGrayPlanemoments_gray_plane)

'alpha'

Approximating plane, parameter Alpha (see moments_gray_planemoments_gray_planeMomentsGrayPlaneMomentsGrayPlaneMomentsGrayPlanemoments_gray_plane)

'beta'

Approximating plane, parameter Beta (see moments_gray_planemoments_gray_planeMomentsGrayPlaneMomentsGrayPlaneMomentsGrayPlanemoments_gray_plane)

Attention

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

Note that the operator gray_featuresgray_featuresGrayFeaturesGrayFeaturesGrayFeaturesgray_features only considers the given RegionsRegionsRegionsRegionsregionsregions and ignores any previously set domain of the input image ImageImageImageImageimageimage.

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_featuresGrayFeaturesGrayFeaturesGrayFeaturesgray_features 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_imageMeanImageMeanImageMeanImagemean_image, entropy_imageentropy_imageEntropyImageEntropyImageEntropyImageentropy_image, sobel_ampsobel_ampSobelAmpSobelAmpSobelAmpsobel_amp, median_separatemedian_separateMedianSeparateMedianSeparateMedianSeparatemedian_separate

Possible Successors

select_grayselect_graySelectGraySelectGraySelectGrayselect_gray, shape_transshape_transShapeTransShapeTransShapeTransshape_trans, reduce_domainreduce_domainReduceDomainReduceDomainReduceDomainreduce_domain, count_objcount_objCountObjCountObjCountObjcount_obj

See also

select_grayselect_graySelectGraySelectGraySelectGrayselect_gray, deviation_imagedeviation_imageDeviationImageDeviationImageDeviationImagedeviation_image, entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray, intensityintensityIntensityIntensityIntensityintensity, mean_imagemean_imageMeanImageMeanImageMeanImagemean_image, min_max_graymin_max_grayMinMaxGrayMinMaxGrayMinMaxGraymin_max_gray, select_objselect_objSelectObjSelectObjSelectObjselect_obj

Module

Foundation