Name
orientation_points_xldorientation_points_xldOrientationPointsXldorientation_points_xldOrientationPointsXldOrientationPointsXld — Orientation of contours or polygons treated as point clouds.
orientation_points_xld(XLD : : : Phi)
Herror orientation_points_xld(const Hobject XLD, double* Phi)
Herror T_orientation_points_xld(const Hobject XLD, Htuple* Phi)
Herror orientation_points_xld(Hobject XLD, double* Phi)
Herror orientation_points_xld(Hobject XLD, HTuple* Phi)
double HXLD::OrientationPointsXld() const
HTuple HXLDArray::OrientationPointsXld() const
void OrientationPointsXld(const HObject& XLD, HTuple* Phi)
HTuple HXLD::OrientationPointsXld() const
The operator orientation_points_xldorientation_points_xldOrientationPointsXldorientation_points_xldOrientationPointsXldOrientationPointsXld calculates the
orientation of the point clouds given by the contours or polygons
XLDXLDXLDXLDXLDXLD (i.e., the order of the points in the contour or
polygon is not taken into account). The orientation Phi is calculated
the same way as in elliptic_axis_points_xldelliptic_axis_points_xldEllipticAxisPointsXldelliptic_axis_points_xldEllipticAxisPointsXldEllipticAxisPointsXld. If the contour or
polygon is closed (end point = start point), the end point of the contour or
polygon is not taken into account to avoid that it receives twice
the weight of the other points.
In addition, the contour point p_{m} with maximum distance to the
center of gravity c is calculated. If the angle between the
vector p_{m}c and the vector given by
Phi is
greater than Pi, the value of Pi is added
to the angle. If XLDXLDXLDXLDXLDXLD consists of only two points,
PhiPhiPhiPhiPhiphi is given by the direction from the first point towards
the second point.
orientation_points_xldorientation_points_xldOrientationPointsXldorientation_points_xldOrientationPointsXldOrientationPointsXld should be used if the contour XLDXLDXLDXLDXLDXLD
intersects itself or if it is not possible to close the contour using a line
from end to start point without self-intersection, because in this case
orientation_xldorientation_xldOrientationXldorientation_xldOrientationXldOrientationXld does not produce useful results. To test whether the
contours or polygons intersect themselves,
test_self_intersection_xldtest_self_intersection_xldTestSelfIntersectionXldtest_self_intersection_xldTestSelfIntersectionXldTestSelfIntersectionXld can be used.
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
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
orientation_xldorientation_xldOrientationXldorientation_xldOrientationXldOrientationXld,
elliptic_axis_points_xldelliptic_axis_points_xldEllipticAxisPointsXldelliptic_axis_points_xldEllipticAxisPointsXldEllipticAxisPointsXld,
smallest_rectangle2_xldsmallest_rectangle2_xldSmallestRectangle2Xldsmallest_rectangle2_xldSmallestRectangle2XldSmallestRectangle2Xld
moments_region_2ndmoments_region_2ndMomentsRegion2ndmoments_region_2ndMomentsRegion2ndMomentsRegion2nd
Foundation