opencv学习之路(41)、人脸识别

一、人脸检测并采集个人图像

opencv学习之路(41)、人脸识别

//take_photo.cpp
#include<opencv2/opencv.hpp>
using namespace cv;
using namespace std; void take_photo() {
VideoCapture cap(); //打开摄像头
if (!cap.isOpened())
return; //加载级联检测器
CascadeClassifier cascade;
cascade.load("F:/opencv3.2/Release_x64/etc/haarcascades/haarcascade_frontalface_alt_tree.xml"); Mat frame;
vector<Rect>faces;
int count = ;
while (cap.read(frame)) //相当于cap >> frame
{
cascade.detectMultiScale(frame, faces, 1.1, , , Size(, ), Size(, ));//检测是否有人脸
for (int i = ; i < faces.size(); i++)
{
if (count % == ) { //每10帧保存一次人脸图像
Mat dst;
resize(frame(faces[i]), dst, Size(, ));//设置人脸图像大小
cvtColor(dst, dst, COLOR_BGR2GRAY);//转为灰度图节省计算
imwrite(format("att_faces/s41/pic%d.jpg", count / ), dst);
}
rectangle(frame, faces[i], Scalar(, , ));
}
imshow("video", frame); //按下任意键退出摄像头(waitkey在本系统环境下默认为255),或者是保存了20张人脸图片后,退出
if (waitKey() != || count / >)
break;
count++;
}
cap.release();
destroyAllWindows();//关闭所有窗口
}

运行程序,打开摄像头后会自动保存人脸图像,头不要晃动,表情变化即可,对于不合适的照片还需进行筛选。

opencv学习之路(41)、人脸识别

二、基于特征脸算法的人脸识别

opencv学习之路(41)、人脸识别

opencv学习之路(41)、人脸识别

//face_recognition.cpp
#include <opencv2/opencv.hpp>
#include <opencv2/face.hpp> using namespace cv;
using namespace cv::face;
using namespace std; double face_recognition() {
//读取文件,转换为数据流
string filename = string("at.txt");
ifstream file(filename.c_str(), ifstream::in);
if (!file)
cout << "error" << endl; string line, path, classlabel;
vector<Mat>image;
vector<int>labels;
char separator = ';';
while (getline(file, line))
{
stringstream liness(line);
getline(liness, path, separator);
getline(liness, classlabel);
if (!path.empty() && !classlabel.empty())
{
//cout << "path:" << path<< endl;
image.push_back(imread(path, ));
labels.push_back(atoi(classlabel.c_str()));
}
}
if (image.size() < || labels.size() < )
cout << "invalid image path..." << endl; //最后一个人为测试样本
Mat testSample = image[image.size() - ];
int testLabel = labels[labels.size() - ];
image.pop_back();
labels.pop_back(); //EigenFace算法的模型训练
Ptr<BasicFaceRecognizer>model = createEigenFaceRecognizer();
model->train(image, labels); //对样本进行识别
int predictLabel = model->predict(testSample);
cout << "actual label:" << testLabel << ",predict label:" << predictLabel << endl; //加载级联检测器
CascadeClassifier cascade;
cascade.load("haarcascade_frontalface_alt_tree.xml");//识别时用alt_tree分类器,宁可漏检也不误检 //打开摄像头
VideoCapture cap();
if (!cap.isOpened())
cout << "error..."; Mat frame;
vector<Rect>faces;
int correct = , total = ;
while (cap.read(frame)) //相当于cap >> frame,读取摄像头的每一帧
{
cascade.detectMultiScale(frame, faces, 1.1, , , Size(, ), Size(, ));//检测是否有人脸
for (int i = ; i < faces.size(); i++)
{
Mat roi = frame(faces[i]);
cvtColor(roi, roi, COLOR_BGR2GRAY);
resize(roi, testSample, testSample.size());
int label = model->predict(testSample);
rectangle(frame, faces[i], Scalar(, , ));
if (label == )
{
putText(frame, "ZhangChunFu", faces[i].tl(), FONT_HERSHEY_COMPLEX, 1.0, Scalar(, , ));
correct++;
}
else
putText(frame, format("%d", label), faces[i].tl(), CV_FONT_HERSHEY_SIMPLEX, 0.8, Scalar(, , ));
}
total++;
imshow("人脸识别——MR.Zhang", frame);
if (waitKey() == )
break;
} cap.release();
destroyAllWindows();//关闭所有窗口
waitKey(); double rate = (1.0*correct) / total;
return rate;//返回正确率
}
//main.cpp
#include <opencv2/opencv.hpp>
#include <opencv2/face.hpp>
#include <iostream> using namespace cv;
using namespace cv::face;
using namespace std; void take_photo();
double face_recognition(); void main() {
int flag;
double rate;
cout << "欢迎使用人脸识别系统(1代表录入人脸,2代表识别人脸),请输入您的选择:" << endl;
cin >> flag;
cout << "请稍等片刻……"<<endl;
switch (flag)
{
case :take_photo();
return;
case :
rate=face_recognition();
break;
default:
break;
}
cout << "识别率:" << rate << endl;
system("pause"); }

opencv学习之路(41)、人脸识别

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