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Fix Bug #3989: correctly identify ellipse with its axes parallel to x-y axes during semi-major axis calculation

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This commit is contained in:
Deanna Hood 2015-04-16 11:59:05 -04:00
parent 81c5d58035
commit 103336c76e
1 changed files with 2 additions and 2 deletions
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4
modules/imgproc/src/shapedescr.cpp
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@ -447,9 +447,9 @@ cv::RotatedRect cv::fitEllipse( InputArray _points )
// store angle and radii // store angle and radii
rp[4] = -0.5 * atan2(gfp[2], gfp[1] - gfp[0]); // convert from APP angle usage rp[4] = -0.5 * atan2(gfp[2], gfp[1] - gfp[0]); // convert from APP angle usage
t = sin(-2.0 * rp[4]); t = sin(-2.0 * rp[4]);
if( fabs(t) > fabs(gfp[2])*min_eps ) if( fabs(t) > min_eps )
t = gfp[2]/t; t = gfp[2]/t;
else else // ellipse is rotated by an integer multiple of pi/2
t = gfp[1] - gfp[0]; t = gfp[1] - gfp[0];
rp[2] = fabs(gfp[0] + gfp[1] - t); rp[2] = fabs(gfp[0] + gfp[1] - t);
if( rp[2] > min_eps ) if( rp[2] > min_eps )