env/opencv-4.8.0/apps/traincascade/features.cpp

#include "opencv2/core.hpp"

#include "traincascade_features.h"
#include "cascadeclassifier.h"

using namespace std;
using namespace cv;

float calcNormFactor( const Mat& sum, const Mat& sqSum )
{
    CV_DbgAssert( sum.cols > 3 && sqSum.rows > 3 );
    Rect normrect( 1, 1, sum.cols - 3, sum.rows - 3 );
    size_t p0, p1, p2, p3;
    CV_SUM_OFFSETS( p0, p1, p2, p3, normrect, sum.step1() )
    double area = normrect.width * normrect.height;
    const int *sp = sum.ptr<int>();
    int valSum = sp[p0] - sp[p1] - sp[p2] + sp[p3];
    const double *sqp = sqSum.ptr<double>();
    double valSqSum = sqp[p0] - sqp[p1] - sqp[p2] + sqp[p3];
    return (float) sqrt( (double) (area * valSqSum - (double)valSum * valSum) );
}

CvParams::CvParams() : name( "params" ) {}
void CvParams::printDefaults() const
{ cout << "--" << name << "--" << endl; }
void CvParams::printAttrs() const {}
bool CvParams::scanAttr( const string, const string ) { return false; }


//---------------------------- FeatureParams --------------------------------------

CvFeatureParams::CvFeatureParams() : maxCatCount( 0 ), featSize( 1 )
{
    name = CC_FEATURE_PARAMS;
}

void CvFeatureParams::init( const CvFeatureParams& fp )
{
    maxCatCount = fp.maxCatCount;
    featSize = fp.featSize;
}

void CvFeatureParams::write( FileStorage &fs ) const
{
    fs << CC_MAX_CAT_COUNT << maxCatCount;
    fs << CC_FEATURE_SIZE << featSize;
}

bool CvFeatureParams::read( const FileNode &node )
{
    if ( node.empty() )
        return false;
    maxCatCount = node[CC_MAX_CAT_COUNT];
    featSize = node[CC_FEATURE_SIZE];
    return ( maxCatCount >= 0 && featSize >= 1 );
}

Ptr<CvFeatureParams> CvFeatureParams::create( int featureType )
{
    return featureType == HAAR ? Ptr<CvFeatureParams>(new CvHaarFeatureParams) :
        featureType == LBP ? Ptr<CvFeatureParams>(new CvLBPFeatureParams) :
        featureType == HOG ? Ptr<CvFeatureParams>(new CvHOGFeatureParams) :
        Ptr<CvFeatureParams>();
}

//------------------------------------- FeatureEvaluator ---------------------------------------

void CvFeatureEvaluator::init(const CvFeatureParams *_featureParams,
                              int _maxSampleCount, Size _winSize )
{
    CV_Assert(_maxSampleCount > 0);
    featureParams = (CvFeatureParams *)_featureParams;
    winSize = _winSize;
    numFeatures = 0;
    cls.create( (int)_maxSampleCount, 1, CV_32FC1 );
    generateFeatures();
}

void CvFeatureEvaluator::setImage(const Mat &img, uchar clsLabel, int idx)
{
    CV_Assert(img.cols == winSize.width);
    CV_Assert(img.rows == winSize.height);
    CV_Assert(idx < cls.rows);
    cls.ptr<float>(idx)[0] = clsLabel;
}

Ptr<CvFeatureEvaluator> CvFeatureEvaluator::create(int type)
{
    return type == CvFeatureParams::HAAR ? Ptr<CvFeatureEvaluator>(new CvHaarEvaluator) :
        type == CvFeatureParams::LBP ? Ptr<CvFeatureEvaluator>(new CvLBPEvaluator) :
        type == CvFeatureParams::HOG ? Ptr<CvFeatureEvaluator>(new CvHOGEvaluator) :
        Ptr<CvFeatureEvaluator>();
}