我无法在人脸检测应用程序中突出显示图像中的人脸。我正在hadoop环境中运行这个人脸检测。我尝试了haarcascade分类器和lbpcascade分类器，但都无法检测和突出显示人脸。代码如下：

public class FaceDetectionOpenCV {
public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
    String input = args[0];
    String output = args[1];

    Job job = new MiprConfigurationParser().getOpenCVJobTemplate();
    job.setJarByClass(FaceDetectionOpenCV.class);
    job.setMapperClass(FaceDetectorMapper.class);
    job.setInputFormatClass(MatImageInputFormat.class);
    job.setOutputFormatClass(MatImageOutputFormat.class);
    Path outputPath = new Path(output);
    FileInputFormat.setInputPaths(job, input);
    FileOutputFormat.setOutputPath(job, outputPath);
    job.setOutputKeyClass(NullWritable.class);
    job.setOutputValueClass(MatImageWritable.class);

    job.waitForCompletion(true);
}

public static class FaceDetectorMapper extends OpenCVMapper<NullWritable, MatImageWritable, NullWritable, MatImageWritable> {

    @Override
    protected void map(NullWritable key, MatImageWritable value, Context context) throws IOException, InterruptedException {
        Mat image = value.getImage();

        if (image != null) {
            //CascadeClassifier faceDetector = new CascadeClassifier("lbpcascade_frontalface.xml");
    CascadeClassifier faceDetector = new CascadeClassifier("haarcascade_frontalface_default.xml");
            MatOfRect faceDetections = new MatOfRect();
            faceDetector.detectMultiScale(image, faceDetections);

            for (Rect rect : faceDetections.toArray()) {
                Core.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height), new Scalar(0, 255, 0),5);
            }

            MatImageWritable matiw = new MatImageWritable(image);

            matiw.setFormat("jpg");
            matiw.setFileName(value.getFileName() + "_result");
            context.write(NullWritable.get(), matiw);
        }
    }
}