My Finding faces code(Chapter 8)

package com.mycompany.openimaj;

import java.io.IOException;
import java.util.List;
import org.openimaj.image.FImage;
import org.openimaj.image.MBFImage;
import org.openimaj.image.colour.RGBColour;
import org.openimaj.image.colour.Transforms;
import org.openimaj.image.processing.face.detection.DetectedFace;
import org.openimaj.image.processing.face.detection.FaceDetector;
import org.openimaj.image.processing.face.detection.HaarCascadeDetector;
import org.openimaj.video.VideoDisplay;
import org.openimaj.video.VideoDisplayListener;
import org.openimaj.video.capture.VideoCapture;


public class NewMain {


    public static void main(String[] args) throws IOException {
        VideoCapture vc = new VideoCapture(320, 240);
        VideoDisplay<MBFImage> vd = VideoDisplay.createVideoDisplay(vc);

        vd.addVideoListener(
                new VideoDisplayListener<MBFImage>() {
                    public void beforeUpdate(MBFImage frame) {
                    }

                    public void afterUpdate(VideoDisplay<MBFImage> display) {
                    }
                });

        FaceDetector<DetectedFace, FImage> fd = new HaarCascadeDetector(40);
        List<DetectedFace> faces = fd.detectFaces(Transforms.calculateIntensity(frame));

        for (DetectedFace face : faces) {
            frame.drawShape(face.getBounds(), RGBColour.RED);
        }

    }
}