Name
convexity_xld convexity_xld ConvexityXld convexity_xld ConvexityXld ConvexityXld — Shape factor for the convexity of contours or polygons.
The operator convexity_xld convexity_xld ConvexityXld convexity_xld ConvexityXld ConvexityXld calculates the convexity for each input
contour or polygon. The input contour or polygon must not
intersect itself, otherwise the resulting parameter is not meaningful
(Whether the input contour or polygon intersects itself or not can be
determined with test_self_intersection_xld test_self_intersection_xld TestSelfIntersectionXld test_self_intersection_xld TestSelfIntersectionXld TestSelfIntersectionXld ). If
the input contour or polygon is not closed it will be closed automatically.
Calculation:
If
is the area of the convex hull and
the area enclosed by the original contour or
polygon the shape factor Convexity Convexity Convexity Convexity Convexity convexity is defined
as:
The shape factor Convexity Convexity Convexity Convexity Convexity convexity is 1 if the contour or polygon is convex
(e.g., a rectangle, circle, etc.). If there are indentations
Convexity Convexity Convexity Convexity Convexity convexity is smaller than 1.
If more than one contour or polygon is passed, the numerical results of the
shape factor are stored in a tuple in the same order as the respective
contours or polygons in XLD XLD XLD XLD XLD XLD .
Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Automatically parallelized on tuple level.
Contours or polygons to be examined.
Convexity of the input contours or polygons.
Assertion: Convexity <= 1
The operator convexity_xld convexity_xld ConvexityXld convexity_xld ConvexityXld ConvexityXld returns the value 2 (H_MSG_TRUE)
if the input is not empty.
The behavior in case of empty input (no input contour available) is
set via the operator set_system('no_object_result',<Result>) set_system("no_object_result",<Result>) SetSystem("no_object_result",<Result>) set_system("no_object_result",<Result>) SetSystem("no_object_result",<Result>) SetSystem("no_object_result",<Result>) .
If necessary an exception is raised.
gen_contours_skeleton_xld gen_contours_skeleton_xld GenContoursSkeletonXld gen_contours_skeleton_xld GenContoursSkeletonXld GenContoursSkeletonXld ,
edges_sub_pix edges_sub_pix EdgesSubPix edges_sub_pix EdgesSubPix EdgesSubPix ,
threshold_sub_pix threshold_sub_pix ThresholdSubPix threshold_sub_pix ThresholdSubPix ThresholdSubPix ,
gen_contour_polygon_xld gen_contour_polygon_xld GenContourPolygonXld gen_contour_polygon_xld GenContourPolygonXld GenContourPolygonXld ,
test_self_intersection_xld test_self_intersection_xld TestSelfIntersectionXld test_self_intersection_xld TestSelfIntersectionXld TestSelfIntersectionXld
area_center_xld area_center_xld AreaCenterXld area_center_xld AreaCenterXld AreaCenterXld ,
select_shape_xld select_shape_xld SelectShapeXld select_shape_xld SelectShapeXld SelectShapeXld ,
shape_trans_xld shape_trans_xld ShapeTransXld shape_trans_xld ShapeTransXld ShapeTransXld
Foundation