利用OpenCV 进行人脸识别

采用opencv3.40

#include 
#include "opencv2\opencv.hpp"
#include 
using namespace std;
using namespace cv;

int main()
{
    string xmlPath = "D:\\opencv\\build\\etc\\haarcascades\\haarcascade_frontalface_default.xml";
    CascadeClassifier ccf;   //创建分类器对象
    Mat img = imread("bb.jpg");
    if (!ccf.load(xmlPath))   //加载训练文件
    {
        cout << "不能加载指定的xml文件" << endl;
        return 0;
    }
    vector faces;  //创建一个容器保存检测出来的脸
    Mat gray;
    cvtColor(img, gray,  COLOR_BGR2GRAY); //转换成灰度图，因为harr特征从灰度图中提取
    equalizeHist(gray, gray);  //直方图均衡行
    ccf.detectMultiScale(gray, faces, 1.1, 3, 0, Size(10, 10), Size(200, 200)); //检测人脸
    for (vector::const_iterator iter = faces.begin(); iter != faces.end(); iter++)
    {
        rectangle(img, *iter, Scalar(0, 0, 255), 2, 8); //画出脸部矩形
    }
    imshow("faces", img);
    waitKey(0);
    return 1;
}