OpenCV中的 HOGDescriptor 类 - linux编程基础

Size()) const;

CV_WRAP static vector getDefaultPeopleDetector();
CV_WRAP static vector getDaimlerPeopleDetector();

CV_PROP Size winSize;
CV_PROP Size blockSize;
CV_PROP Size blockStride;
CV_PROP Size cellSize;
CV_PROP int nbins;
CV_PROP int derivAperture;
CV_PROP double winSigma;
CV_PROP int histogramNormType;
CV_PROP double L2HysThreshold;
CV_PROP bool gammaCorrection;
CV_PROP vector svmDetector;
CV_PROP int nlevels;

// eva luate specified ROI and return confidence value for each location
void detectROI(const cv::Mat& img, const vector &locations,
CV_OUT std::vector& foundLocations, CV_OUT std::vector& confidences,
double hitThreshold = 0, cv::Size winStride = Size(),
cv::Size padding = Size()) const;

// eva luate specified ROI and return confidence value for each location in multiple scales
void detectMultiScaleROI(const cv::Mat& img,
CV_OUT std::vector& foundLocations,
std::vector& locations,
double hitThreshold = 0,
int groupThreshold = 0) const;

// read/parse Dalal's alt model file
void readALTModel(std::string modelfile);
};

默认构造函数的几个参数：

winSize(64,128), blockSize(16,16), blockStride(8,8),
cellSize(8,8), nbins(9), derivAperture(1), winSigma(-1),
histogramNormType(HOGDescriptor::L2Hys), L2HysThreshold(0.2), gammaCorrection(true),
nlevels(HOGDescriptor::DEFAULT_NLEVELS)

winSize ：窗口的大小
blockSize ：块的大小
cellSize：胞元的大小
nbins：方向bin的个数 nBins表示在一个胞元（cell）中统计梯度的方向数目，例如nBins=9时，在一个胞元内统计9个方向的梯度直方图，每个方向为360/9=40度。

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OpenCV中的 HOGDescriptor 类(二)