Java를 이용하여 구현된 얼굴 검출 및 인식 기술

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

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

        // Load Haar classifier
        CascadeClassifier faceDetector = new CascadeClassifier("path/to/haarcascade_frontalface_default.xml");

        // Load image
        Mat image = Imgcodecs.imread("path/to/image.jpg");

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

        // Draw rectangles around detected faces
        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, 0, 255), 2);
        }

        // Save image with detected faces
        Imgcodecs.imwrite("path/to/result.jpg", image);
    }
}

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfRect;
import org.opencv.core.Point;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.opencv.objdetect.CascadeClassifier;
import org.opencv.face.FaceRecognizer;
import org.opencv.face.LBPHFaceRecognizer;

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

        // Load Haar classifier
        CascadeClassifier faceDetector = new CascadeClassifier("path/to/haarcascade_frontalface_default.xml");

        // Load face recognizer
        FaceRecognizer recognizer = LBPHFaceRecognizer.create();

        // Load all images from the directory
        for (int i = 1; i <= 10; i++) {
            String fileName = "path/to/database/" + i + ".jpg";
            Mat image = Imgcodecs.imread(fileName);

            // Convert image to grayscale
            Imgproc.cvtColor(image, image, Imgproc.COLOR_BGR2GRAY);

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

            // Extract face features
            Mat face = new Mat();
            face = image.submat(faceDetections.toArray()[0]);
            recognizer.train(face, new Mat());
        }

        // Load input image
        Mat inputImage = Imgcodecs.imread("path/to/input/image.jpg");
        Imgproc.cvtColor(inputImage, inputImage, Imgproc.COLOR_BGR2GRAY);

        // Detect face
        MatOfRect faceDetections = new MatOfRect();
        faceDetector.detectMultiScale(inputImage, faceDetections);

        // Recognize face
        Mat inputFace = new Mat();
        inputFace = inputImage.submat(faceDetections.toArray()[0]);
        int[] label = new int[1];
        double[] confidence = new double[1];
        recognizer.predict(inputFace, label, confidence);

        // Draw rectangle and name of recognized person
        Imgproc.rectangle(inputImage, faceDetections.toArray()[0].tl(),
                faceDetections.toArray()[0].br(), new Scalar(0, 0, 255), 2);
        Imgproc.putText(inputImage, "Person " + label[0], faceDetections.toArray()[0].tl(),
                Imgproc.FONT_HERSHEY_PLAIN, 1, new Scalar(0, 255, 0), 2);

        // Show and save result
        Imgcodecs.imwrite("path/to/result.jpg", inputImage);
    }
}