Java OpenCV人脸检测与照片编辑：如何用Java和OpenCV实现人脸检测及照片尺寸、背景调整？

import org.opencv.core.*;
import org.opencv.objdetect.CascadeClassifier;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

public class FaceDetector {
    public static void main(String[] args) {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        CascadeClassifier faceDetector = new CascadeClassifier("path/to/haarcascade_frontalface_default.xml");
        Mat image = Imgcodecs.imread("path/to/input/image.jpg");
        MatOfRect faceDetections = new MatOfRect();
        faceDetector.detectMultiScale(image, faceDetections);
        System.out.println(String.format("Detected %s faces", faceDetections.toArray().length));
    }
}

Mat resizedImage = new Mat();
Size newSize = new Size(newWidth, newHeight);
Imgproc.resize(image, resizedImage, newSize);

Rect face = faceDetections.toArray()[0]; // 假设只检测到一张人脸
int faceWidth = face.width;
int faceTop = face.y;
int faceHeight = face.height;