get_region_contourT_get_region_contourGetRegionContourGetRegionContour (Operator)

Name

get_region_contourT_get_region_contourGetRegionContourGetRegionContour — Access the contour of an object.

Signature

get_region_contour(Region : : : Rows, Columns)

The operator get_region_contourget_region_contourGetRegionContourGetRegionContourGetRegionContour returns the contour of a region. A contour is a result of line (RowsRowsRowsRowsrows) and column coordinates (ColumnsColumnsColumnsColumnscolumns), describing the boundary of the region. The contour lies on the region. It starts at the smallest line number. In that line at the pixel with the largest column index. The rotation direction is clockwise. The first pixel of the contour is identical with the last. Holes of the region are ignored. The operator get_region_contourget_region_contourGetRegionContourGetRegionContourGetRegionContour returns the coordinates in the form of tuples. An empty region is passed as empty tuple.

Attention

Holes of the region are ignored. Only one region may be passed, and this region must have exactly one connection component.

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

RegionRegionRegionRegionregion (input_object) region → object

Output region.

RowsRowsRowsRowsrows (output_control) contour.y-array → (integer)

Line numbers of the contour pixels.

ColumnsColumnsColumnsColumnscolumns (output_control) contour.x-array → (integer)

Column numbers of the contour pixels.

Number of elements: Columns == Rows

Result

The operator get_region_contourget_region_contourGetRegionContourGetRegionContourGetRegionContour normally returns the value 2 (H_MSG_TRUE). If more than one connection component is passed an exception is raised. The behavior in case of empty input (no input regions 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>).

Possible Predecessors

sobel_ampsobel_ampSobelAmpSobelAmpSobelAmp, thresholdthresholdThresholdThresholdThreshold, skeletonskeletonSkeletonSkeletonSkeleton, edges_imageedges_imageEdgesImageEdgesImageEdgesImage, gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1GenRectangle1, gen_circlegen_circleGenCircleGenCircleGenCircle

Module

Foundation

Operators