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Adding an export for HOGDetector compatibility.

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An SVM train with HOG could export a single vector for HOGDetector.
This commit is contained in:
Mathieu Barnachon 2013-08-22 15:00:32 +12:00
parent 4ed9b1ca9a
commit 7f3273c77f
2 changed files with 34 additions and 0 deletions
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3
modules/ml/include/opencv2/ml.hpp
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@ -518,6 +518,9 @@ public:
virtual CvSVMParams get_params() const { return params; };
CV_WRAP virtual void clear();
// return a single vector for HOG detector.
virtual void get_svm_detector( std::vector< float > & detector ) const;
static CvParamGrid get_default_grid( int param_id );
virtual void write( CvFileStorage* storage, const char* name ) const;

31
modules/ml/src/svm.cpp
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@ -1245,6 +1245,37 @@ const float* CvSVM::get_support_vector(int i) const
return sv && (unsigned)i < (unsigned)sv_total ? sv[i] : 0;
}
void CvSVM::get_svm_detector( std::vector< float > & detector ) const
{
CV_Assert( var_all > 0 &&
sv_total > 0 &&
sv != 0 &&
decision_func != 0 &&
decision_func->alpha != 0 &&
decision_func->sv_count == sv_total );
float svi = 0.f;
detector.clear(); //clear stuff in vector.
detector.reserve( var_all + 1 ); //reserve place for memory efficiency.
/**
* detector^i = \sum_j support_vector_j^i * \alpha_j
* detector^dim = -\rho
*/
for( int i = 0 ; i < var_all ; ++i )
{
svi = 0.f;
for( int j = 0 ; j < sv_total ; ++j )
{
if( decision_func->sv_index != NULL ) // sometime the sv_index isn't store on YML/XML.
svi += (float)( sv[decision_func->sv_index[j]][i] * decision_func->alpha[ j ] );
else
svi += (float)( sv[j][i] * decision_func->alpha[ j ] );
}
detector.push_back( svi );
}
detector.push_back( -decision_func->rho );
}
bool CvSVM::set_params( const CvSVMParams& _params )
{