OpenCV cv::HOGDescriptor & cv::gpu::HOGDescriptor sample

gpu_hog.cpp

#include <SDKDDKVer.h>
#include <Windows.h>

#pragma warning(disable:4819)
#pragma warning(disable:4996)

// for OpenCV2
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/gpu/gpu.hpp"
#include "opencv2/highgui/highgui.hpp"

#ifdef _DEBUG
#pragma comment(lib, "opencv_core231d.lib")
#pragma comment(lib, "opencv_imgproc231d.lib")
#pragma comment(lib, "opencv_objdetect231d.lib")
#pragma comment(lib, "opencv_gpu231d.lib")
#pragma comment(lib, "opencv_features2d231d.lib")
#pragma comment(lib, "opencv_highgui231d.lib")
#else
#pragma comment(lib, "opencv_core231.lib")
#pragma comment(lib, "opencv_imgproc231.lib")
#pragma comment(lib, "opencv_objdetect231.lib")
#pragma comment(lib, "opencv_objdetect231d.lib")
#pragma comment(lib, "opencv_gpu231.lib")
#pragma comment(lib, "opencv_features2d231.lib")
#pragma comment(lib, "opencv_highgui231.lib")
#endif

//#define USE_VIDEO_CAPTURE
//#define USE_GPU

int main(int argc, char** argv)
{
	cv::Mat src_img;

#ifdef USE_VIDEO_CAPTURE
	cv::VideoCapture capture;
	capture.set(CV_CAP_PROP_FRAME_WIDTH, 640);
	capture.set(CV_CAP_PROP_FRAME_HEIGHT, 480);
	capture.open(0);
#else
	cv::Mat target_img = cv::imread("..\\img\\test_hog.jpg");
#endif

#ifdef USE_GPU
	cv::gpu::GpuMat src_gpu, mono_gpu;
	cv::gpu::HOGDescriptor hog;
	hog.setSVMDetector(cv::gpu::HOGDescriptor::getDefaultPeopleDetector());
#else
	cv::HOGDescriptor hog;
	cv::Mat mono_img;
	hog.setSVMDetector(cv::HOGDescriptor::getDefaultPeopleDetector());
#endif

	std::vector<cv::Rect> found;
	while(true) {
#ifdef USE_VIDEO_CAPTURE
		capture >> src_img;
#else
		src_img = target_img.clone();
#endif

#ifdef USE_GPU
		src_gpu.upload(src_img);
		cv::gpu::cvtColor(src_gpu, mono_gpu, CV_BGR2GRAY);
		hog.detectMultiScale(mono_gpu, found);
#else
		cv::cvtColor(src_img, mono_img, CV_BGR2GRAY);
		hog.detectMultiScale(mono_img, found);
#endif

		for(unsigned i = 0; i < found.size(); i++) {
			cv::Rect r = found[i];
			rectangle(src_img, r.tl(), r.br(), cv::Scalar(0,255,0), 2);
		}
		cv::imshow("test", src_img);

		int c = cv::waitKey(1);
		if( c == 27) break;
	}
	return 0;
}