opencv中简单的人脸识别操作

利用opencv自带的训练好的模型进行人脸检测，没有什么技术含量主要可以了解一下各种操作

#include <iostream>
#include <opencv2/opencv.hpp>
using namespace std;
using namespace  cv;

int main(int argc, char** argv)
{
	//读取训练好的文件地址
	string face_file = "C:/MyOpenCV/install/etc/haarcascades/haarcascade_frontalface_alt.xml";
	Mat src = imread("E:/picture/teengirl.jpg");
	if (src.data == NULL)
	{
		cout << "Can not find the image...";
		return -1;
	}
	CascadeClassifier face_detect;
	if (!face_detect.load(face_file))
	{
		cout << "Can not find the file..." << endl;
		return -2;
	}
	imshow("Input img", src);
	Mat gray,equa_gray;
	cvtColor(src, gray, COLOR_BGR2GRAY);
	equalizeHist(gray, equa_gray);//增强对比度
	vector<Rect> faces;
	face_detect.detectMultiScale(equa_gray, faces, 1.1, 3, 0, Size(24, 24));
	for (size_t t = 0; t < faces.size(); t++)
	{
		rectangle(src, faces[t], Scalar(0, 255, 0), 1, 8);
	}
	imshow("Out put", src);
	waitKey(0);
	return 0;
}

效果：