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Merge pull request #7790 from sovrasov:convexity_defects_enable_small_hulls

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Alexander Alekhin 2016-12-13 10:33:56 +00:00
commit 7a3b5b308c
1 changed files with 6 additions and 1 deletions
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7
modules/imgproc/src/convhull.cpp
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@ -280,11 +280,16 @@ void convexityDefects( InputArray _points, InputArray _hull, OutputArray _defect
Mat hull = _hull.getMat(); Mat hull = _hull.getMat();
int hpoints = hull.checkVector(1, CV_32S); int hpoints = hull.checkVector(1, CV_32S);
CV_Assert( hpoints > 2 ); CV_Assert( hpoints > 0 );
const Point* ptr = points.ptr<Point>(); const Point* ptr = points.ptr<Point>();
const int* hptr = hull.ptr<int>(); const int* hptr = hull.ptr<int>();
std::vector<Vec4i> defects; std::vector<Vec4i> defects;
if ( hpoints < 3 ) //if hull consists of one or two points, contour is always convex
{
_defects.release();
return;
}
// 1. recognize co-orientation of the contour and its hull // 1. recognize co-orientation of the contour and its hull
bool rev_orientation = ((hptr[1] > hptr[0]) + (hptr[2] > hptr[1]) + (hptr[0] > hptr[2])) != 2; bool rev_orientation = ((hptr[1] > hptr[0]) + (hptr[2] > hptr[1]) + (hptr[0] > hptr[2])) != 2;