fixed SIFT when keypoints vector is empty (#1162)

0b1575c4 · Maria Dimashova · fbed6d1d · 0b1575c4
Commit 0b1575c4 authored Jul 08, 2011 by Maria Dimashova
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sift.cpp modules/features2d/src/sift.cpp +2 -1

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--- a/modules/features2d/src/sift.cpp
+++ b/modules/features2d/src/sift.cpp
@@ -1722,7 +1722,8 @@ void SIFT::operator()(const Mat& image, const Mat& mask,
        KeyPointsFilter::removeDuplicated( keypoints );

        // Compute descriptors.
-        cvSeqRemoveSlice( featuresSeq, cvSlice(0, featuresSeq->total) );
+        if( featuresSeq->total > 0 )
+            cvSeqRemoveSlice( featuresSeq, cvSlice(0, featuresSeq->total) );
    }

    for( size_t i = 0; i < keypoints.size(); i++ )