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 of the object

'row':

Row index of the center

'column':

Column index of the center

'row1':

Row index of upper left corner

'column1':

Column index of upper left corner

'row2':

Row index of lower right corner

'column2':

Column index of lower right corner

'width':

Width of the region (parallel to the coordinate axis)

'height':

Height of the region (parallel to the coordinate axis)

'circularity':

Circularity (see circularitycircularityCircularityCircularityCircularitycircularity)

'compactness':

Compactness (see compactnesscompactnessCompactnessCompactnessCompactnesscompactness)

'contlength':

Total length of contour (see operator contlengthcontlengthContlengthContlengthContlengthcontlength)

'convexity':

Convexity (see convexityconvexityConvexityConvexityConvexityconvexity)

'rectangularity':

Rectangularity (see rectangularityrectangularityRectangularityRectangularityRectangularityrectangularity)

'ra':

Main radius of the equivalent ellipse (see elliptic_axiselliptic_axisEllipticAxisEllipticAxisEllipticAxiselliptic_axis)

'rb':

Secondary radius of the equivalent ellipse (see elliptic_axiselliptic_axisEllipticAxisEllipticAxisEllipticAxiselliptic_axis)

'phi':

Orientation of the equivalent ellipse see elliptic_axiselliptic_axisEllipticAxisEllipticAxisEllipticAxiselliptic_axis)

'anisometry:'

Anisometry (see eccentricityeccentricityEccentricityEccentricityEccentricityeccentricity)

'bulkiness:'

Bulkiness (see operator eccentricityeccentricityEccentricityEccentricityEccentricityeccentricity)

'struct_factor:'

Structure Factor (see operator eccentricityeccentricityEccentricityEccentricityEccentricityeccentricity)

'outer_radius':

Radius of smallest surrounding circle (see smallest_circlesmallest_circleSmallestCircleSmallestCircleSmallestCirclesmallest_circle)

'inner_radius':

Radius of largest inner circle (see inner_circleinner_circleInnerCircleInnerCircleInnerCircleinner_circle)

'inner_width':

Width of the largest axis-parallel rectangle that fits into the region (see inner_rectangle1inner_rectangle1InnerRectangle1InnerRectangle1InnerRectangle1inner_rectangle1)

'inner_height':

Height of the largest axis-parallel rectangle that fits into the region (see inner_rectangle1inner_rectangle1InnerRectangle1InnerRectangle1InnerRectangle1inner_rectangle1)

'dist_mean':

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

'dist_deviation:'

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

'roundness':

Roundness (see operator roundnessroundnessRoundnessRoundnessRoundnessroundness)

'num_sides':

Number of polygon sides (see operator roundnessroundnessRoundnessRoundnessRoundnessroundness)

'connect_num':

Number of connection components (see operator connect_and_holesconnect_and_holesConnectAndHolesConnectAndHolesConnectAndHolesconnect_and_holes)

'holes_num':

Number of holes (see operator connect_and_holesconnect_and_holesConnectAndHolesConnectAndHolesConnectAndHolesconnect_and_holes)

'area_holes':

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

'max_diameter':

Maximum diameter of the region (see operator diameter_regiondiameter_regionDiameterRegionDiameterRegionDiameterRegiondiameter_region)

'orientation':

Orientation of the region (see operator orientation_regionorientation_regionOrientationRegionOrientationRegionOrientationRegionorientation_region)

'euler_number':

Euler number (see operator euler_numbereuler_numberEulerNumberEulerNumberEulerNumbereuler_number)

'rect2_phi':

Orientation of the smallest surrounding rectangle (see operator smallest_rectangle2smallest_rectangle2SmallestRectangle2SmallestRectangle2SmallestRectangle2smallest_rectangle2)

'rect2_len1':

Half the length of the smallest surrounding rectangle (see operator smallest_rectangle2smallest_rectangle2SmallestRectangle2SmallestRectangle2SmallestRectangle2smallest_rectangle2)

'rect2_len2':

Half the width of the smallest surrounding rectangle (see operator smallest_rectangle2smallest_rectangle2SmallestRectangle2SmallestRectangle2SmallestRectangle2smallest_rectangle2)

'moments_m11':

Geometric moments of the region (see operator moments_region_2ndmoments_region_2ndMomentsRegion2ndMomentsRegion2ndMomentsRegion2ndmoments_region_2nd)

'moments_m20':

Geometric moments of the region (see operator moments_region_2ndmoments_region_2ndMomentsRegion2ndMomentsRegion2ndMomentsRegion2ndmoments_region_2nd)

'moments_m02':

Geometric moments of the region (see operator moments_region_2ndmoments_region_2ndMomentsRegion2ndMomentsRegion2ndMomentsRegion2ndmoments_region_2nd)

'moments_ia':

Geometric moments of the region (see operator moments_region_2ndmoments_region_2ndMomentsRegion2ndMomentsRegion2ndMomentsRegion2ndmoments_region_2nd)

'moments_ib':

Geometric moments of the region (see operator moments_region_2ndmoments_region_2ndMomentsRegion2ndMomentsRegion2ndMomentsRegion2ndmoments_region_2nd)

'moments_m11_invar':

Geometric moments of the region (see operator moments_region_2nd_invarmoments_region_2nd_invarMomentsRegion2ndInvarMomentsRegion2ndInvarMomentsRegion2ndInvarmoments_region_2nd_invar)

'moments_m20_invar':

Geometric moments of the region (see operator moments_region_2nd_invarmoments_region_2nd_invarMomentsRegion2ndInvarMomentsRegion2ndInvarMomentsRegion2ndInvarmoments_region_2nd_invar)

'moments_m02_invar':

Geometric moments of the region (see operator moments_region_2nd_invarmoments_region_2nd_invarMomentsRegion2ndInvarMomentsRegion2ndInvarMomentsRegion2ndInvarmoments_region_2nd_invar)

'moments_phi1':

Geometric moments of the region (see operator moments_region_2nd_rel_invarmoments_region_2nd_rel_invarMomentsRegion2ndRelInvarMomentsRegion2ndRelInvarMomentsRegion2ndRelInvarmoments_region_2nd_rel_invar)

'moments_phi2':

Geometric moments of the region (see operator moments_region_2nd_rel_invarmoments_region_2nd_rel_invarMomentsRegion2ndRelInvarMomentsRegion2ndRelInvarMomentsRegion2ndRelInvarmoments_region_2nd_rel_invar)

'moments_m21':

Geometric moments of the region (see operator moments_region_3rdmoments_region_3rdMomentsRegion3rdMomentsRegion3rdMomentsRegion3rdmoments_region_3rd)

'moments_m12':

Geometric moments of the region (see operator moments_region_3rdmoments_region_3rdMomentsRegion3rdMomentsRegion3rdMomentsRegion3rdmoments_region_3rd)

'moments_m03':

Geometric moments of the region (see operator moments_region_3rdmoments_region_3rdMomentsRegion3rdMomentsRegion3rdMomentsRegion3rdmoments_region_3rd)

'moments_m30':

Geometric moments of the region (see operator moments_region_3rdmoments_region_3rdMomentsRegion3rdMomentsRegion3rdMomentsRegion3rdmoments_region_3rd)

'moments_m21_invar':

Geometric moments of the region (see operator moments_region_3rd_invarmoments_region_3rd_invarMomentsRegion3rdInvarMomentsRegion3rdInvarMomentsRegion3rdInvarmoments_region_3rd_invar)

'moments_m12_invar':

Geometric moments of the region (see operator moments_region_3rd_invarmoments_region_3rd_invarMomentsRegion3rdInvarMomentsRegion3rdInvarMomentsRegion3rdInvarmoments_region_3rd_invar)

'moments_m03_invar':

Geometric moments of the region (see operator moments_region_3rd_invarmoments_region_3rd_invarMomentsRegion3rdInvarMomentsRegion3rdInvarMomentsRegion3rdInvarmoments_region_3rd_invar)

'moments_m30_invar':

Geometric moments of the region (see operator moments_region_3rd_invarmoments_region_3rd_invarMomentsRegion3rdInvarMomentsRegion3rdInvarMomentsRegion3rdInvarmoments_region_3rd_invar)

'moments_i1':

Geometric moments of the region (see operator moments_region_centralmoments_region_centralMomentsRegionCentralMomentsRegionCentralMomentsRegionCentralmoments_region_central)

'moments_i2':

Geometric moments of the region (see operator moments_region_centralmoments_region_centralMomentsRegionCentralMomentsRegionCentralMomentsRegionCentralmoments_region_central)

'moments_i3':

Geometric moments of the region (see operator moments_region_centralmoments_region_centralMomentsRegionCentralMomentsRegionCentralMomentsRegionCentralmoments_region_central)

'moments_i4':

Geometric moments of the region (see operator moments_region_centralmoments_region_centralMomentsRegionCentralMomentsRegionCentralMomentsRegionCentralmoments_region_central)

'moments_psi1':

Geometric moments of the region (see operator moments_region_central_invarmoments_region_central_invarMomentsRegionCentralInvarMomentsRegionCentralInvarMomentsRegionCentralInvarmoments_region_central_invar)

'moments_psi2':

Geometric moments of the region (see operator moments_region_central_invarmoments_region_central_invarMomentsRegionCentralInvarMomentsRegionCentralInvarMomentsRegionCentralInvarmoments_region_central_invar)

'moments_psi3':

Geometric moments of the region (see operator moments_region_central_invarmoments_region_central_invarMomentsRegionCentralInvarMomentsRegionCentralInvarMomentsRegionCentralInvarmoments_region_central_invar)

'moments_psi4':

Geometric moments of the region (see operator moments_region_central_invarmoments_region_central_invarMomentsRegionCentralInvarMomentsRegionCentralInvarMomentsRegionCentralInvarmoments_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.