oencv学习（6）--HOG源码解释

 首先我们进入HOGDescriptor所在的头文件，看看它的构造函数需要哪些参数。 

    cellSize(8,8), nbins(9), derivAperture(1), winSigma(-1),
    histogramNormType(HOGDescriptor::L2Hys), L2HysThreshold(0.2), gammaCorrection(true),
    nlevels(HOGDescriptor::DEFAULT_NLEVELS)
{}

CV_WRAP HOGDescriptor(
Size _winSize,                                                               窗口大小
Size _blockSize,                                                             块大小
Size _blockStride,                                                         滑动增量
Size _cellSize,                                                              单元大小
int _nbins,                                                                   方向
int _derivAperture=1,                                                      1
double _winSigma=-1,                                                   -1
 int _histogramNormType=HOGDescriptor::L2Hys,             HogDes::L2Hys
double _L2HysThreshold=0.2,                                         0.2
bool _gammaCorrection=false,                                            true
              int _nlevels=HOGDescriptor::DEFAULT_NLEVELS)
: winSize(_winSize), blockSize(_blockSize), blockStride(_blockStride), cellSize(_cellSize),
nbins(_nbins), derivAperture(_derivAperture), winSigma(_winSigma),
histogramNormType(_histogramNormType), L2HysThreshold(_L2HysThreshold),
gammaCorrection(_gammaCorrection), nlevels(_nlevels)
{}

CV_WRAP HOGDescriptor(const String& filename)
{
    load(filename);
}

HOGDescriptor(const HOGDescriptor& d)
{
    d.copyTo(*this);
}