segment_contour_attrib_xldsegment_contour_attrib_xldSegmentContourAttribXldSegmentContourAttribXld (Operator)

Name

segment_contour_attrib_xldsegment_contour_attrib_xldSegmentContourAttribXldSegmentContourAttribXld — Segment XLD contour parts whose local attributes fulfill given conditions.

Signature

Description

segment_contour_attrib_xldsegment_contour_attrib_xldSegmentContourAttribXldSegmentContourAttribXldSegmentContourAttribXld segments the contour in ContourContourContourContourcontour into contour parts ContourPartContourPartContourPartContourPartcontourPart. The segmentation of the contour depends on the values of its attributes AttributeAttributeAttributeAttributeattribute (see the possible values for AttributeAttributeAttributeAttributeattribute below). The operator checks which attribute values lie within the given limits (MinMinMinMinmin, MaxMaxMaxMaxmax) and returns the corresponding contour segments with its attributes in ContourPartContourPartContourPartContourPartcontourPart.

If OperationOperationOperationOperationoperation is set to 'and', each of the given attributes must lie within the limits. If OperationOperationOperationOperationoperation is set to 'or', at least one of the attributes has to be within the limits. The attributes are processed in the same order as they are given in AttributeAttributeAttributeAttributeattribute. If only one attribute is used, the value of OperationOperationOperationOperationoperation is ignored.

Note that not all attributes are defined in all contours per default. Which attributes are defined for a contour depends on how the contour was instantiated, and whether some operations have been previously performed on it. For example, the attributes 'width_right' and 'width_left' are only defined, if the contour was created with the operator lines_gausslines_gaussLinesGaussLinesGaussLinesGauss. Likewise, the attribute 'distance' is only present if the distances to some other contour was previously calculated with distance_contours_xlddistance_contours_xldDistanceContoursXldDistanceContoursXldDistanceContoursXld or apply_distance_transform_xldapply_distance_transform_xldApplyDistanceTransformXldApplyDistanceTransformXldApplyDistanceTransformXld.

Condition:

Possible values for AttributeAttributeAttributeAttributeattribute:

'edge_direction':

Edge direction

'angle':

Angle of the direction perpendicular to the contour

'response':

Magnitude of the second derivative

'width_right':

Line width to the right of the line

'width_left':

Line width to the left of the line

'contrast':

Contrast of the line point

'asymmetry':

Asymmetry of the line point

'distance':

Minimum pointwise distance to a reference contour

To find out which operators add the attributes above to contours and further details about those attributes, see get_contour_attrib_xldget_contour_attrib_xldGetContourAttribXldGetContourAttribXldGetContourAttribXld.

Execution Information

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Processed without parallelization.

Parameters

Example (HDevelop)

read_image (Image, 'fabrik')
edges_sub_pix (Image, Edges, 'canny', 1, 20, 40)
* select 'vertical' edges:
segment_contour_attrib_xld (Edges, ContourPart, 'edge_direction', \
                            'and', rad(90-20), rad(90+20))

Result

The operator segment_contour_attrib_xldsegment_contour_attrib_xldSegmentContourAttribXldSegmentContourAttribXldSegmentContourAttribXld returns the value 2 (H_MSG_TRUE) if the input is not empty. The behavior in case of empty input (no input objects available) is set via the operator set_system('no_object_result',<Result>)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>). If necessary, an exception is raised.

Possible Predecessors

lines_gausslines_gaussLinesGaussLinesGaussLinesGauss, edges_sub_pixedges_sub_pixEdgesSubPixEdgesSubPixEdgesSubPix, apply_distance_transform_xldapply_distance_transform_xldApplyDistanceTransformXldApplyDistanceTransformXldApplyDistanceTransformXld, distance_contours_xlddistance_contours_xldDistanceContoursXldDistanceContoursXldDistanceContoursXld

Possible Successors

fit_line_contour_xldfit_line_contour_xldFitLineContourXldFitLineContourXldFitLineContourXld, fit_ellipse_contour_xldfit_ellipse_contour_xldFitEllipseContourXldFitEllipseContourXldFitEllipseContourXld, fit_circle_contour_xldfit_circle_contour_xldFitCircleContourXldFitCircleContourXldFitCircleContourXld, fit_rectangle2_contour_xldfit_rectangle2_contour_xldFitRectangle2ContourXldFitRectangle2ContourXldFitRectangle2ContourXld

See also

split_contours_xldsplit_contours_xldSplitContoursXldSplitContoursXldSplitContoursXld, get_contour_global_attrib_xldget_contour_global_attrib_xldGetContourGlobalAttribXldGetContourGlobalAttribXldGetContourGlobalAttribXld, query_contour_attribs_xldquery_contour_attribs_xldQueryContourAttribsXldQueryContourAttribsXldQueryContourAttribsXld, get_contour_attrib_xldget_contour_attrib_xldGetContourAttribXldGetContourAttribXldGetContourAttribXld

Module

Foundation