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Fixed cvExtractSURF in case of no keypoints found #2076

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This commit is contained in:
Andrey Kamaev 2012-06-28 05:59:30 +00:00
parent d60b1f2f82
commit e8b0d27942
1 changed files with 18 additions and 18 deletions
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36
modules/legacy/src/features2d.cpp
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@ -17,16 +17,16 @@
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* disclaimer.
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* copyright notice, this list of conditions and the following
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*
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@ -71,26 +71,26 @@ cvExtractSURF( const CvArr* _img, const CvArr* _mask,
mask = cvarrToMat(_mask);
vector<KeyPoint> kpt;
Mat descr;
Ptr<Feature2D> surf = Algorithm::create<Feature2D>("Feature2D.SURF");
if( surf.empty() )
CV_Error(CV_StsNotImplemented, "OpenCV was built without SURF support");
surf->set("hessianThreshold", params.hessianThreshold);
surf->set("nOctaves", params.nOctaves);
surf->set("nOctaveLayers", params.nOctaveLayers);
surf->set("upright", params.upright != 0);
surf->set("extended", params.extended != 0);
surf->operator()(img, mask, kpt, _descriptors ? _OutputArray(descr) : noArray(),
useProvidedKeyPts != 0);
if( _keypoints )
*_keypoints = cvCreateSeq(0, sizeof(CvSeq), sizeof(CvSURFPoint), storage);
if( _descriptors )
*_descriptors = cvCreateSeq(0, sizeof(CvSeq), descr.cols*descr.elemSize(), storage);
*_descriptors = cvCreateSeq(0, sizeof(CvSeq), surf->descriptorSize() * CV_ELEM_SIZE(surf->descriptorType()), storage);
for( size_t i = 0; i < kpt.size(); i++ )
{
if( _keypoints )
@ -113,7 +113,7 @@ cvGetStarKeypoints( const CvArr* _img, CvMemStorage* storage,
params.suppressNonmaxSize);
vector<KeyPoint> kpts;
star->detect(cvarrToMat(_img), kpts, Mat());
CvSeq* seq = cvCreateSeq(0, sizeof(CvSeq), sizeof(CvStarKeypoint), storage);
for( size_t i = 0; i < kpts.size(); i++ )
{