人脸识别

人脸识别在生活中已经随处可见，今天使用opencv来实践一番。

void example_face_dectect(cv::Mat &image, cv::CascadeClassifier faceCascade, cv::CascadeClassifier  eyeCascade) {
	std::vector<cv::Rect> faces;
	std::vector<cv::Rect> eyes;
	cv::Mat imageGray;
	cv::cvtColor(image, imageGray, cv::COLOR_BGR2GRAY); //转为灰度图
	cv::equalizeHist(imageGray, imageGray); //直方图均衡化，提高对比度
	faceCascade.detectMultiScale(imageGray, faces, 1.1, 2, 0 | CV_HAAR_SCALE_IMAGE, cv::Size(30, 30));  //检测人脸
	for (int i = 0;i < faces.size();i++) {
		cv::Point center(faces[i].x + faces[i].width*0.5, faces[i].y + faces[i].height*0.5);
		cv::ellipse(image, center, cv::Size(faces[i].width*0.5, faces[i].height*0.5), 0, 0, 360, cv::Scalar(255, 0, 255), 4, 8, 0); // 标记人脸，画个圆
		
		cv::Mat faceFrame = imageGray(faces[i]);
		eyeCascade.detectMultiScale(faceFrame, eyes, 1.1, 2, 0 | CV_HAAR_SCALE_IMAGE, cv::Size(30, 30)); //检测眼睛
		for (int j = 0;j < eyes.size();j++) {
			cv::Point center(faces[i].x + eyes[j].x + eyes[j].width*0.5, faces[i].y + eyes[j].y + eyes[j].height*0.5);
			int radius = cvRound((eyes[j].width + eyes[i].height)*0.25);
			cv::circle(image, center, radius, cv::Scalar(255, 0, 0), 4, 8, 0); // 标记人眼，画个圆
		}   
		eyes.clear();
	}
	faces.clear();
}

int main()
{
	cv::Mat image;
	cv::CascadeClassifier faceCascade, eyeCascade;
	cv::VideoCapture videoCapture;
	cv::namedWindow(\"example_face_dectect\", cv::WINDOW_AUTOSIZE);

	char keyQuit;
	if (!faceCascade.load(\"d:\\\\dev\\\\opencv\\\\build\\\\etc\\\\haarcascades\\\\haarcascade_frontalface_alt.xml\")) { //加载人眼特征文件
		cerr << \"can\'t load haarcascade_frontalface_alt.xml\" << endl;
		return -1;
	}
	if (!eyeCascade.load(\"D:\\\\dev\\\\opencv\\\\build\\\\etc\\\\haarcascades\\\\haarcascade_eye_tree_eyeglasses.xml\")) { //加载人眼特征文件
		cerr << \"can\'t load haarcascade_eye_tree_eyeglasses.xml\" << endl;
		return -1;
	}
	if (videoCapture.open(0)) { //打开摄像头
		for (;;) {
			videoCapture >> image;
			if (image.empty()) break;
			example_face_dectect(image, faceCascade, eyeCascade);
			cv::imshow(\"example_face_dectect\", image);
			keyQuit = cv::waitKey(30);
			if (keyQuit == 27)break;
		}
	}

	//example0904();
	//example1103();
	//exampleMouse();
	//exampleFile();
	//addWeightedExample();
	//example9();
	//example5(frame);
	//example6();
	//example4(frame);
	//example2_5(frame);
	//example4(image);
	//cv::imshow(\"test\", frame);
	//cv::waitKey(0);
	return 0;
}