OpenCV Java FaceRecognizer返回错误的标签

Question

我试图使用OpenCV在java中制作面部识别应用程序。人脸检测工作完美，但识别会返回不存在的标签。我试图使用来自火车照片的测试照片，它返回0，但是照片的标签是4.有时它返回一些疯狂的数字（底片或非常大）。

以下是培训的ma代码：

 public void trainRecognizer(){

    File root = new File("photos");

    FilenameFilter imgFilter = new FilenameFilter() {
        public boolean accept(File dir, String name) {
            name = name.toLowerCase();
            return name.endsWith(".jpg") || name.endsWith(".pgm") || name.endsWith(".png");
        }
    };

    File[] imageFiles = root.listFiles(imgFilter);

    List<Mat> images = new ArrayList<>();

    Mat labels = new Mat(imageFiles.length, 1, CV_32SC1);
    int[] labelsArray = new int[imageFiles.length];

    int counter = 0;

    for (File image : imageFiles) {
        Mat img = imread(image.getAbsolutePath(), CV_LOAD_IMAGE_GRAYSCALE);

        int label = Integer.parseInt(image.getName().split("\\-")[0]);

        images.add(img);

        labels.put(counter, label);
        labelsArray[counter] = label;

        counter++;
    }

    faceRecognizer =  FisherFaceRecognizer.create();

    System.out.println("Starting train");
    faceRecognizer.train(images, labels);

    System.out.println("Training complete");
    recognitionStart = true;
}

这是测试：

int[] label = {-1};
double[] conf = {0.0};
Mat testImage = imread("photos/4-7.jpg", CV_LOAD_IMAGE_GRAYSCALE);
faceRecognizer.predict(testImage, label, conf);
System.out.println("Predicted label: " + label[0]);
System.out.println("Confidence of the prediction: " + conf[0]);