Features

List of Operators ↓

This chapter contains operators that allow you to access the different features of regions.

List of Features

In the following, the available features are illustrated.

'area'"area""area""area""area":

Area of the object

'row'"row""row""row""row":

Row index of the center

'column'"column""column""column""column":

Column index of the center

'row1'"row1""row1""row1""row1":

Row index of upper left corner

'column1'"column1""column1""column1""column1":

Column index of upper left corner

'row2'"row2""row2""row2""row2":

Row index of lower right corner

'column2'"column2""column2""column2""column2":

Column index of lower right corner

'width'"width""width""width""width":

Width of the region (parallel to the coordinate axis)

'height'"height""height""height""height":

Height of the region (parallel to the coordinate axis)

'circularity'"circularity""circularity""circularity""circularity":

Circularity (see circularitycircularityCircularityCircularitycircularity)

'compactness'"compactness""compactness""compactness""compactness":

Compactness (see compactnesscompactnessCompactnessCompactnesscompactness)

'contlength'"contlength""contlength""contlength""contlength":

Total length of contour (see operator contlengthcontlengthContlengthContlengthcontlength)

'convexity'"convexity""convexity""convexity""convexity":

Convexity (see convexityconvexityConvexityConvexityconvexity)

'rectangularity'"rectangularity""rectangularity""rectangularity""rectangularity":

Rectangularity (see rectangularityrectangularityRectangularityRectangularityrectangularity)

'ra'"ra""ra""ra""ra":

Main radius of the equivalent ellipse (see elliptic_axiselliptic_axisEllipticAxisEllipticAxiselliptic_axis)

'rb'"rb""rb""rb""rb":

Secondary radius of the equivalent ellipse (see elliptic_axiselliptic_axisEllipticAxisEllipticAxiselliptic_axis)

'phi'"phi""phi""phi""phi":

Orientation of the equivalent ellipse see elliptic_axiselliptic_axisEllipticAxisEllipticAxiselliptic_axis)

'anisometry'"anisometry""anisometry""anisometry""anisometry":

Anisometry (see eccentricityeccentricityEccentricityEccentricityeccentricity)

'bulkiness'"bulkiness""bulkiness""bulkiness""bulkiness":

Bulkiness (see operator eccentricityeccentricityEccentricityEccentricityeccentricity)

'struct_factor'"struct_factor""struct_factor""struct_factor""struct_factor":

Structure Factor (see operator eccentricityeccentricityEccentricityEccentricityeccentricity)

'outer_radius'"outer_radius""outer_radius""outer_radius""outer_radius":

Radius of smallest surrounding circle (see smallest_circlesmallest_circleSmallestCircleSmallestCirclesmallest_circle)

'inner_radius'"inner_radius""inner_radius""inner_radius""inner_radius":

Radius of largest inner circle (see inner_circleinner_circleInnerCircleInnerCircleinner_circle)

'inner_width'"inner_width""inner_width""inner_width""inner_width":

Width of the largest axis-parallel rectangle that fits into the region (see inner_rectangle1inner_rectangle1InnerRectangle1InnerRectangle1inner_rectangle1)

'inner_height'"inner_height""inner_height""inner_height""inner_height":

Height of the largest axis-parallel rectangle that fits into the region (see inner_rectangle1inner_rectangle1InnerRectangle1InnerRectangle1inner_rectangle1)

'dist_mean'"dist_mean""dist_mean""dist_mean""dist_mean":

Mean distance from the region border to the center (see operator roundnessroundnessRoundnessRoundnessroundness)

'dist_deviation'"dist_deviation""dist_deviation""dist_deviation""dist_deviation":

Deviation of the distance from the region border to the center (see operator roundnessroundnessRoundnessRoundnessroundness)

'roundness'"roundness""roundness""roundness""roundness":

Roundness (see operator roundnessroundnessRoundnessRoundnessroundness)

'num_sides'"num_sides""num_sides""num_sides""num_sides":

Number of polygon sides (see operator roundnessroundnessRoundnessRoundnessroundness)

'connect_num'"connect_num""connect_num""connect_num""connect_num":

Number of connection components (see operator connect_and_holesconnect_and_holesConnectAndHolesConnectAndHolesconnect_and_holes)

'holes_num'"holes_num""holes_num""holes_num""holes_num":

Number of holes (see operator connect_and_holesconnect_and_holesConnectAndHolesConnectAndHolesconnect_and_holes)

'area_holes'"area_holes""area_holes""area_holes""area_holes":

Area of the holes of the object (see operator area_holesarea_holesAreaHolesAreaHolesarea_holes)

'max_diameter'"max_diameter""max_diameter""max_diameter""max_diameter":

Maximum diameter of the region (see operator diameter_regiondiameter_regionDiameterRegionDiameterRegiondiameter_region)

'orientation'"orientation""orientation""orientation""orientation":

Orientation of the region (see operator orientation_regionorientation_regionOrientationRegionOrientationRegionorientation_region)

'euler_number'"euler_number""euler_number""euler_number""euler_number":

Euler number (see operator euler_numbereuler_numberEulerNumberEulerNumbereuler_number)

'rect2_phi'"rect2_phi""rect2_phi""rect2_phi""rect2_phi":

Orientation of the smallest surrounding rectangle (see operator smallest_rectangle2smallest_rectangle2SmallestRectangle2SmallestRectangle2smallest_rectangle2)

'rect2_len1'"rect2_len1""rect2_len1""rect2_len1""rect2_len1":

Half the length of the smallest surrounding rectangle (see operator smallest_rectangle2smallest_rectangle2SmallestRectangle2SmallestRectangle2smallest_rectangle2)

'rect2_len2'"rect2_len2""rect2_len2""rect2_len2""rect2_len2":

Half the width of the smallest surrounding rectangle (see operator smallest_rectangle2smallest_rectangle2SmallestRectangle2SmallestRectangle2smallest_rectangle2)

'moments_m11'"moments_m11""moments_m11""moments_m11""moments_m11":

Geometric moments of the region (see operator moments_region_2ndmoments_region_2ndMomentsRegion2ndMomentsRegion2ndmoments_region_2nd)

'moments_m20'"moments_m20""moments_m20""moments_m20""moments_m20":

Geometric moments of the region (see operator moments_region_2ndmoments_region_2ndMomentsRegion2ndMomentsRegion2ndmoments_region_2nd)

'moments_m02'"moments_m02""moments_m02""moments_m02""moments_m02":

Geometric moments of the region (see operator moments_region_2ndmoments_region_2ndMomentsRegion2ndMomentsRegion2ndmoments_region_2nd)

'moments_ia'"moments_ia""moments_ia""moments_ia""moments_ia":

Geometric moments of the region (see operator moments_region_2ndmoments_region_2ndMomentsRegion2ndMomentsRegion2ndmoments_region_2nd)

'moments_ib'"moments_ib""moments_ib""moments_ib""moments_ib":

Geometric moments of the region (see operator moments_region_2ndmoments_region_2ndMomentsRegion2ndMomentsRegion2ndmoments_region_2nd)

'moments_m11_invar'"moments_m11_invar""moments_m11_invar""moments_m11_invar""moments_m11_invar":

Geometric moments of the region (see operator moments_region_2nd_invarmoments_region_2nd_invarMomentsRegion2ndInvarMomentsRegion2ndInvarmoments_region_2nd_invar)

'moments_m20_invar'"moments_m20_invar""moments_m20_invar""moments_m20_invar""moments_m20_invar":

Geometric moments of the region (see operator moments_region_2nd_invarmoments_region_2nd_invarMomentsRegion2ndInvarMomentsRegion2ndInvarmoments_region_2nd_invar)

'moments_m02_invar'"moments_m02_invar""moments_m02_invar""moments_m02_invar""moments_m02_invar":

Geometric moments of the region (see operator moments_region_2nd_invarmoments_region_2nd_invarMomentsRegion2ndInvarMomentsRegion2ndInvarmoments_region_2nd_invar)

'moments_phi1'"moments_phi1""moments_phi1""moments_phi1""moments_phi1":

Geometric moments of the region (see operator moments_region_2nd_rel_invarmoments_region_2nd_rel_invarMomentsRegion2ndRelInvarMomentsRegion2ndRelInvarmoments_region_2nd_rel_invar)

'moments_phi2'"moments_phi2""moments_phi2""moments_phi2""moments_phi2":

Geometric moments of the region (see operator moments_region_2nd_rel_invarmoments_region_2nd_rel_invarMomentsRegion2ndRelInvarMomentsRegion2ndRelInvarmoments_region_2nd_rel_invar)

'moments_m21'"moments_m21""moments_m21""moments_m21""moments_m21":

Geometric moments of the region (see operator moments_region_3rdmoments_region_3rdMomentsRegion3rdMomentsRegion3rdmoments_region_3rd)

'moments_m12'"moments_m12""moments_m12""moments_m12""moments_m12":

Geometric moments of the region (see operator moments_region_3rdmoments_region_3rdMomentsRegion3rdMomentsRegion3rdmoments_region_3rd)

'moments_m03'"moments_m03""moments_m03""moments_m03""moments_m03":

Geometric moments of the region (see operator moments_region_3rdmoments_region_3rdMomentsRegion3rdMomentsRegion3rdmoments_region_3rd)

'moments_m30'"moments_m30""moments_m30""moments_m30""moments_m30":

Geometric moments of the region (see operator moments_region_3rdmoments_region_3rdMomentsRegion3rdMomentsRegion3rdmoments_region_3rd)

'moments_m21_invar'"moments_m21_invar""moments_m21_invar""moments_m21_invar""moments_m21_invar":

Geometric moments of the region (see operator moments_region_3rd_invarmoments_region_3rd_invarMomentsRegion3rdInvarMomentsRegion3rdInvarmoments_region_3rd_invar)

'moments_m12_invar'"moments_m12_invar""moments_m12_invar""moments_m12_invar""moments_m12_invar":

Geometric moments of the region (see operator moments_region_3rd_invarmoments_region_3rd_invarMomentsRegion3rdInvarMomentsRegion3rdInvarmoments_region_3rd_invar)

'moments_m03_invar'"moments_m03_invar""moments_m03_invar""moments_m03_invar""moments_m03_invar":

Geometric moments of the region (see operator moments_region_3rd_invarmoments_region_3rd_invarMomentsRegion3rdInvarMomentsRegion3rdInvarmoments_region_3rd_invar)

'moments_m30_invar'"moments_m30_invar""moments_m30_invar""moments_m30_invar""moments_m30_invar":

Geometric moments of the region (see operator moments_region_3rd_invarmoments_region_3rd_invarMomentsRegion3rdInvarMomentsRegion3rdInvarmoments_region_3rd_invar)

'moments_i1'"moments_i1""moments_i1""moments_i1""moments_i1":

Geometric moments of the region (see operator moments_region_centralmoments_region_centralMomentsRegionCentralMomentsRegionCentralmoments_region_central)

'moments_i2'"moments_i2""moments_i2""moments_i2""moments_i2":

Geometric moments of the region (see operator moments_region_centralmoments_region_centralMomentsRegionCentralMomentsRegionCentralmoments_region_central)

'moments_i3'"moments_i3""moments_i3""moments_i3""moments_i3":

Geometric moments of the region (see operator moments_region_centralmoments_region_centralMomentsRegionCentralMomentsRegionCentralmoments_region_central)

'moments_i4'"moments_i4""moments_i4""moments_i4""moments_i4":

Geometric moments of the region (see operator moments_region_centralmoments_region_centralMomentsRegionCentralMomentsRegionCentralmoments_region_central)

'moments_psi1'"moments_psi1""moments_psi1""moments_psi1""moments_psi1":

Geometric moments of the region (see operator moments_region_central_invarmoments_region_central_invarMomentsRegionCentralInvarMomentsRegionCentralInvarmoments_region_central_invar)

'moments_psi2'"moments_psi2""moments_psi2""moments_psi2""moments_psi2":

Geometric moments of the region (see operator moments_region_central_invarmoments_region_central_invarMomentsRegionCentralInvarMomentsRegionCentralInvarmoments_region_central_invar)

'moments_psi3'"moments_psi3""moments_psi3""moments_psi3""moments_psi3":

Geometric moments of the region (see operator moments_region_central_invarmoments_region_central_invarMomentsRegionCentralInvarMomentsRegionCentralInvarmoments_region_central_invar)

'moments_psi4'"moments_psi4""moments_psi4""moments_psi4""moments_psi4":

Geometric moments of the region (see operator moments_region_central_invarmoments_region_central_invarMomentsRegionCentralInvarMomentsRegionCentralInvarmoments_region_central_invar)

List of Operators

area_centerAreaCenterarea_centerAreaCenterarea_center

Area and center of regions.

area_holesAreaHolesarea_holesAreaHolesarea_holes

Compute the area of holes of regions.

circularityCircularitycircularityCircularitycircularity

Shape factor for the circularity (similarity to a circle) of a region.

compactnessCompactnesscompactnessCompactnesscompactness

Shape factor for the compactness of a region.

connect_and_holesConnectAndHolesconnect_and_holesConnectAndHolesconnect_and_holes

Number of connection components and holes

contlengthContlengthcontlengthContlengthcontlength

Contour length of a region.

convexityConvexityconvexityConvexityconvexity

Shape factor for the convexity of a region.

diameter_regionDiameterRegiondiameter_regionDiameterRegiondiameter_region

Maximal distance between two boundary points of a region.

eccentricityEccentricityeccentricityEccentricityeccentricity

Shape features derived from the ellipse parameters.

elliptic_axisEllipticAxiselliptic_axisEllipticAxiselliptic_axis

Calculate the parameters of the equivalent ellipse.

euler_numberEulerNumbereuler_numberEulerNumbereuler_number

Calculate the Euler number.

find_neighborsFindNeighborsfind_neighborsFindNeighborsfind_neighbors

Search direct neighbors.

get_region_indexGetRegionIndexget_region_indexGetRegionIndexget_region_index

Index of all regions containing a given pixel.

get_region_thicknessGetRegionThicknessget_region_thicknessGetRegionThicknessget_region_thickness

Access the thickness of a region along the main axis.

hamming_distanceHammingDistancehamming_distanceHammingDistancehamming_distance

Hamming distance between two regions.

hamming_distance_normHammingDistanceNormhamming_distance_normHammingDistanceNormhamming_distance_norm

Hamming distance between two regions using normalization.

height_width_ratioHeightWidthRatioheight_width_ratioHeightWidthRatioheight_width_ratio

Compute the width, height, and aspect ratio of the surrounding rectangle parallel to the coordinate axes.

inner_circleInnerCircleinner_circleInnerCircleinner_circle

Largest inner circle of a region.

inner_rectangle1InnerRectangle1inner_rectangle1InnerRectangle1inner_rectangle1

Largest inner rectangle of a region.

moments_region_2ndMomentsRegion2ndmoments_region_2ndMomentsRegion2ndmoments_region_2nd

Calculate the geometric moments of regions.

moments_region_2nd_invarMomentsRegion2ndInvarmoments_region_2nd_invarMomentsRegion2ndInvarmoments_region_2nd_invar

Geometric moments of regions.

moments_region_2nd_rel_invarMomentsRegion2ndRelInvarmoments_region_2nd_rel_invarMomentsRegion2ndRelInvarmoments_region_2nd_rel_invar

Geometric moments of regions.

moments_region_3rdMomentsRegion3rdmoments_region_3rdMomentsRegion3rdmoments_region_3rd

Geometric moments of regions.

moments_region_3rd_invarMomentsRegion3rdInvarmoments_region_3rd_invarMomentsRegion3rdInvarmoments_region_3rd_invar

Geometric moments of regions.

moments_region_centralMomentsRegionCentralmoments_region_centralMomentsRegionCentralmoments_region_central

Geometric moments of regions.

moments_region_central_invarMomentsRegionCentralInvarmoments_region_central_invarMomentsRegionCentralInvarmoments_region_central_invar

Geometric moments of regions.

orientation_regionOrientationRegionorientation_regionOrientationRegionorientation_region

Orientation of a region.

rectangularityRectangularityrectangularityRectangularityrectangularity

Shape factor for the rectangularity of a region.

region_featuresRegionFeaturesregion_featuresRegionFeaturesregion_features

Calculate shape features of regions.

roundnessRoundnessroundnessRoundnessroundness

Shape factors from contour.

runlength_distributionRunlengthDistributionrunlength_distributionRunlengthDistributionrunlength_distribution

Distribution of runs needed for runlength encoding of a region.

runlength_featuresRunlengthFeaturesrunlength_featuresRunlengthFeaturesrunlength_features

Characteristic values for runlength coding of regions.

select_region_pointSelectRegionPointselect_region_pointSelectRegionPointselect_region_point

Choose all regions containing a given pixel.

select_region_spatialSelectRegionSpatialselect_region_spatialSelectRegionSpatialselect_region_spatial

Pose relation of regions.

select_shapeSelectShapeselect_shapeSelectShapeselect_shape

Choose regions with the aid of shape features.

select_shape_protoSelectShapeProtoselect_shape_protoSelectShapeProtoselect_shape_proto

Choose regions having a certain relation to each other.

select_shape_stdSelectShapeStdselect_shape_stdSelectShapeStdselect_shape_std

Select regions of a given shape.

smallest_circleSmallestCirclesmallest_circleSmallestCirclesmallest_circle

Smallest surrounding circle of a region.

smallest_rectangle1SmallestRectangle1smallest_rectangle1SmallestRectangle1smallest_rectangle1

Surrounding rectangle parallel to the coordinate axes.

smallest_rectangle2SmallestRectangle2smallest_rectangle2SmallestRectangle2smallest_rectangle2

Smallest surrounding rectangle with any orientation.

spatial_relationSpatialRelationspatial_relationSpatialRelationspatial_relation

Pose relation of regions with regard to the coordinate axes.