opencv人脸识别C++代码

1. 导入库

#include <opencv2/opencv.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

2. 定义命名空间

using namespace cv;
using namespace std;

3. 读取待检测的图片

Mat img = imread("image.jpg");

4. 创建 Haar 级联分类器

CascadeClassifier face_cascade;
face_cascade.load("haarcascade_frontalface_alt.xml");

5. 使用分类器检测人脸

vector<Rect> faces;
face_cascade.detectMultiScale(img, faces, 1.1, 2, 0|CV_HAAR_SCALE_IMAGE, Size(30, 30));

6. 绘制检测出的人脸

for (size_t i = 0; i < faces.size(); i++) {
    rectangle(img, faces[i], Scalar(0, 0, 255), 2, 8, 0);
}

完整代码：

#include <opencv2/opencv.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

using namespace cv;
using namespace std;

int main() {
    Mat img = imread("image.jpg");
    CascadeClassifier face_cascade;
    face_cascade.load("haarcascade_frontalface_alt.xml");
    vector<Rect> faces;
    face_cascade.detectMultiScale(img, faces, 1.1, 2, 0|CV_HAAR_SCALE_IMAGE, Size(30, 30));
    for (size_t i = 0; i < faces.size(); i++) {
        rectangle(img, faces[i], Scalar(0, 0, 255), 2, 8, 0);
    }
    imshow("Detected Face", img);
    waitKey(0);
    return 0;
}