HOG Descriptor .setSVMDetector

svp un commentaire pour ce code et mercii
Mat img;
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	HOGDescriptor hog;
	hog.setSVMDetector(HOGDescriptor::getDefaultPeopleDetector());
 
	namedWindow("video capture", CV_WINDOW_AUTOSIZE);
	while (true)
	{
		cap >> img;
		if (!img.data)
			continue;
 
		vector<Rect> found, found_filtered;
		hog.detectMultiScale(img, found, 0, Size(8, 8), Size(32, 32), 1.05, 2);
 
		size_t i, j;
		for (i = 0; i<found.size(); i++)
		{
			Rect r = found[i];
			for (j = 0; j<found.size(); j++)
				if (j != i && (r & found[j]) == r)
					break;
			if (j == found.size())
				found_filtered.push_back(r);
		}
		for (i = 0; i<found_filtered.size(); i++)
		{
			Rect r = found_filtered[i];
			r.x += cvRound(r.width*0.1);
			r.width = cvRound(r.width*0.8);
			r.y += cvRound(r.height*0.06);
			r.height = cvRound(r.height*0.9);
			rectangle(img, r.tl(), r.br(), cv::Scalar(0, 255, 0), 2);
		}