get_region_polygon — Polygon approximation of a region.
The operator get_region_polygon calculates a polygon to approximate the
edge of a region. A polygon is a sequence of line (Rows) and
column coordinates (Columns). It describes the contour of the region.
Only the base points of the polygon are returned.
The parameter Tolerance indicates how large the maximum distance
between the polygon and the edge of the region may be.
Holes of the region are ignored.
The operator get_region_polygon returns the coordinates in the form of tuples.
Holes of the region are ignored. Only one region may be passed, and this region must have exactly one connection component.
Region (input_object) region → object
Region to be approximated.
Tolerance (input_control) number → (real / integer)
Maximum distance between the polygon and the edge of the region.
Default value: 5.0
Suggested values: 0.0, 2.0, 5.0, 10.0
Typical range of values: 0.0
≤
Tolerance
(lin)
Minimum increment: 0.01
Recommended increment: 1.0
Rows (output_control) polygon.y-array → (integer)
Line numbers of the base points of the contour.
Columns (output_control) polygon.x-array → (integer)
Column numbers of the base points of the contour.
Number of elements: Columns == Rows
The operator get_region_polygon 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>).
sobel_amp,
threshold,
skeleton,
edges_image
copy_obj,
gen_region_polygon,
disp_polygon,
get_region_contour,
set_line_approx
Foundation