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[move sift.cpp] fix overflow issue when computing diagonal

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- with big images the int multiplication can overflow

original commit: d4df727d38
This commit is contained in:
Martin Nowak 2016-06-11 17:51:46 +02:00
parent 24284d3d17
commit 99d914ea3b
1 changed files with 1 additions and 1 deletions
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2
modules/features2d/src/sift.cpp
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@ -544,7 +544,7 @@ static void calcSIFTDescriptor( const Mat& img, Point2f ptf, float ori, float sc
float hist_width = SIFT_DESCR_SCL_FCTR * scl;
int radius = cvRound(hist_width * 1.4142135623730951f * (d + 1) * 0.5f);
// Clip the radius to the diagonal of the image to avoid autobuffer too large exception
radius = std::min(radius, (int) sqrt((double) img.cols*img.cols + img.rows*img.rows));
radius = std::min(radius, (int) sqrt(((double) img.cols)*img.cols + ((double) img.rows)*img.rows));
cos_t /= hist_width;
sin_t /= hist_width;