fixed drawKeypoints (keypoint orientation)

14 years ago · 8a61375875
parent 9c2efd6cbd
commit 8a61375875
1 changed files with 3 additions and 2 deletions
--- a/modules/features2d/src/draw.cpp
+++ b/modules/features2d/src/draw.cpp
@ -67,8 +67,9 @@ static inline void _drawKeypoint( Mat& img, const KeyPoint& p, const Scalar& col
        if( p.angle != -1 )
        {
            float srcAngleRad = p.angle*(float)CV_PI/180.f;
-            Point orient(cvRound(cos(srcAngleRad)*radius), 
+            Point orient( cvRound( cos(srcAngleRad)*radius ),
-						 cvRound(sin(srcAngleRad)*radius));
+                          cvRound(-sin(srcAngleRad)*radius ) // "-" to invert orientation of axis y
                        );
            line( img, center, center+orient, color, 1, CV_AA, draw_shift_bits );
        }
 #if 0