Name
orientation_xldorientation_xldOrientationXldorientation_xldOrientationXldOrientationXld — Orientation of contours or polygons.
orientation_xld(XLD : : : Phi)
Herror orientation_xld(const Hobject XLD, double* Phi)
Herror T_orientation_xld(const Hobject XLD, Htuple* Phi)
Herror orientation_xld(Hobject XLD, double* Phi)
Herror orientation_xld(Hobject XLD, HTuple* Phi)
double HXLD::OrientationXld() const
HTuple HXLDArray::OrientationXld() const
void OrientationXld(const HObject& XLD, HTuple* Phi)
HTuple HXLD::OrientationXld() const
The operator orientation_xldorientation_xldOrientationXldorientation_xldOrientationXldOrientationXld calculates the orientation of
each input contour or polygon. The operator is based on
elliptic_axis_xldelliptic_axis_xldEllipticAxisXldelliptic_axis_xldEllipticAxisXldEllipticAxisXld. In addition, the contour respectively polygon
point with maximum distance to the center of gravity is calculated. If the
column coordinate of this point is less than the column coordinate
of the center of gravity the value of Pi is added to the
angle. It is assumed that the contours or polygons are closed. If
this is not the case orientation_xldorientation_xldOrientationXldorientation_xldOrientationXldOrientationXld will artificially close
the contours or polygons.
It should be noted that orientation_xldorientation_xldOrientationXldorientation_xldOrientationXldOrientationXld only returns useful
results if the contour or polygon encloses a region in the plane. In
particular, the contour or polygon must not intersect itself. This
is particularly important if open contours or polygons are passed
because they are closed automatically, which can produce a
self-intersection. To test whether the contours or polygons
intersect themselves, test_self_intersection_xldtest_self_intersection_xldTestSelfIntersectionXldtest_self_intersection_xldTestSelfIntersectionXldTestSelfIntersectionXld can be
used. If the contour or polygon intersects itself, useful values
for the orientation can be calculated with
orientation_points_xldorientation_points_xldOrientationPointsXldorientation_points_xldOrientationPointsXldOrientationPointsXld.
If more than one contour or polygon is passed, the values of the
orientations are stored in a tuple in the same order as the respective
contours or polygons in XLDXLDXLDXLDXLDXLD.
- 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.
Orientation of the contours or polygons (radians).
Assertion: - pi < Phi && Phi <= pi
The operator orientation_xldorientation_xldOrientationXldorientation_xldOrientationXldOrientationXld returns the value 2 (H_MSG_TRUE) if the input
is not empty. The behavior in case of empty input (no input contours
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_xldgen_contours_skeleton_xldGenContoursSkeletonXldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXld,
edges_sub_pixedges_sub_pixEdgesSubPixedges_sub_pixEdgesSubPixEdgesSubPix,
threshold_sub_pixthreshold_sub_pixThresholdSubPixthreshold_sub_pixThresholdSubPixThresholdSubPix,
gen_contour_polygon_xldgen_contour_polygon_xldGenContourPolygonXldgen_contour_polygon_xldGenContourPolygonXldGenContourPolygonXld,
test_self_intersection_xldtest_self_intersection_xldTestSelfIntersectionXldtest_self_intersection_xldTestSelfIntersectionXldTestSelfIntersectionXld
elliptic_axis_xldelliptic_axis_xldEllipticAxisXldelliptic_axis_xldEllipticAxisXldEllipticAxisXld,
smallest_rectangle2_xldsmallest_rectangle2_xldSmallestRectangle2Xldsmallest_rectangle2_xldSmallestRectangle2XldSmallestRectangle2Xld
moments_region_2ndmoments_region_2ndMomentsRegion2ndmoments_region_2ndMomentsRegion2ndMomentsRegion2nd
Foundation