local_max_contours_xldlocal_max_contours_xldLocalMaxContoursXldLocalMaxContoursXld (Operator)


local_max_contours_xldlocal_max_contours_xldLocalMaxContoursXldLocalMaxContoursXld — Select XLD contours with a local maximum of gray values.


local_max_contours_xld(Contours, Image : LocalMaxContours : MinPercent, MinDiff, Distance : )

Herror local_max_contours_xld(const Hobject Contours, const Hobject Image, Hobject* LocalMaxContours, const Hlong MinPercent, const Hlong MinDiff, const Hlong Distance)

Herror T_local_max_contours_xld(const Hobject Contours, const Hobject Image, Hobject* LocalMaxContours, const Htuple MinPercent, const Htuple MinDiff, const Htuple Distance)

void LocalMaxContoursXld(const HObject& Contours, const HObject& Image, HObject* LocalMaxContours, const HTuple& MinPercent, const HTuple& MinDiff, const HTuple& Distance)

HXLDCont HXLDCont::LocalMaxContoursXld(const HImage& Image, const HTuple& MinPercent, Hlong MinDiff, Hlong Distance) const

HXLDCont HXLDCont::LocalMaxContoursXld(const HImage& Image, Hlong MinPercent, Hlong MinDiff, Hlong Distance) const

static void HOperatorSet.LocalMaxContoursXld(HObject contours, HObject image, out HObject localMaxContours, HTuple minPercent, HTuple minDiff, HTuple distance)

HXLDCont HXLDCont.LocalMaxContoursXld(HImage image, HTuple minPercent, int minDiff, int distance)

HXLDCont HXLDCont.LocalMaxContoursXld(HImage image, int minPercent, int minDiff, int distance)


local_max_contours_xldlocal_max_contours_xldLocalMaxContoursXldLocalMaxContoursXldLocalMaxContoursXld selects XLD contours from the contours passed in ContoursContoursContoursContourscontours, which have a local maximum in gray values across the direction of the contour. In order to be selected, at least MinPercentMinPercentMinPercentMinPercentminPercent of the contour points must have a local maximum perpendicular to the direction of the contour. The contours' direction is determined by fitting a regression line through five neighboring points of the contour. In order to decide whether there is a local maximum for a contour point, a gray value profile that is DistanceDistanceDistanceDistancedistance points wide and perpendicular to the contour is computed on both sides of the contour. If the gray value at the contour point is at least MinDiffMinDiffMinDiffMinDiffminDiff larger than the gray value at at least one point on each side of the profile, the contour point is labeled as a local maximum. The selected contours are returned in LocalMaxContoursLocalMaxContoursLocalMaxContoursLocalMaxContourslocalMaxContours.

Execution Information


ContoursContoursContoursContourscontours (input_object)  xld_cont-array objectHXLDContHXLDContHobject

XLD contours to be examined.

ImageImageImageImageimage (input_object)  singlechannelimage objectHImageHImageHobject (byte)

Corresponding gray value image.

LocalMaxContoursLocalMaxContoursLocalMaxContoursLocalMaxContourslocalMaxContours (output_object)  xld_cont-array objectHXLDContHXLDContHobject *

Selected contours.

MinPercentMinPercentMinPercentMinPercentminPercent (input_control)  number HTupleHTupleHtuple (integer / real) (int / long / double) (Hlong / double) (Hlong / double)

Minimum percentage of maximum points.

Default value: 70

Suggested values: 60, 70, 75, 80, 85, 90, 95

Restriction: 0.0 <= MinPercent && MinPercent <= 100.0

MinDiffMinDiffMinDiffMinDiffminDiff (input_control)  integer HTupleHTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Minimum amount by which the gray value at the maximum must be larger than in the profile.

Default value: 15

Suggested values: 5, 8, 10, 12, 15, 20

Restriction: 0 <= MinDiff && MinDiff <= 255

DistanceDistanceDistanceDistancedistance (input_control)  integer HTupleHTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Maximum width of profile used to check for maxima.

Default value: 4

Suggested values: 2, 3, 4, 5, 6

Restriction: Distance >= 1

Possible Predecessors

gen_contours_skeleton_xldgen_contours_skeleton_xldGenContoursSkeletonXldGenContoursSkeletonXldGenContoursSkeletonXld, lines_gausslines_gaussLinesGaussLinesGaussLinesGauss, lines_facetlines_facetLinesFacetLinesFacetLinesFacet, edges_sub_pixedges_sub_pixEdgesSubPixEdgesSubPixEdgesSubPix

Possible Successors


See also