java实现人脸识别的代码

以下是一个基于Java实现人脸识别的示例代码：

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfRect;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.objdetect.CascadeClassifier;

public class FaceRecognition {
    public static void main(String[] args) {
        // Load OpenCV library
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

        // Load the trained Haar classifier
        CascadeClassifier faceDetector = new CascadeClassifier("haarcascade_frontalface_alt.xml");

        // Load the image file
        Mat image = Imgcodecs.imread("image.jpg");

        // Detect faces in the image
        MatOfRect faceDetections = new MatOfRect();
        faceDetector.detectMultiScale(image, faceDetections);

        // Draw a bounding box around each detected face
        for (Rect rect : faceDetections.toArray()) {
            Imgproc.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height),
                    new Scalar(0, 255, 0), 3);
        }

        // Save the output image
        Imgcodecs.imwrite("output.jpg", image);
    }
}

这段代码使用了OpenCV库中的级联分类器来实现人脸检测，将检测到的人脸用矩形框标注出来，并保存输出图像。