Problem in code to capture image through Enter webcam

Question

import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
import javax.imageio.*;
import javax.media.*;
import javax.media.control.*;
import javax.media.format.*;
import javax.media.util.*;
public class camHandler{
private CaptureDeviceInfo deviceInfo;
private Player player;
public camHandler() {}
public void ini() {
// Create capture device
this.deviceInfo = CaptureDeviceManager.getDevice("vfw:Microsoft WDM Image Capture (Win32):0");
player = null;
try {
player = Manager.createRealizedPlayer(deviceInfo.getLocator());
catch (CannotRealizeException ex) {
ex.printStackTrace();
catch (NoPlayerException ex) {
ex.printStackTrace();
catch (IOException ex) {
ex.printStackTrace();
player.start();
// Wait a few seconds for camera to initialise (otherwise img==null)
try {
Thread.sleep(2500);
catch (InterruptedException ex1) {
ex1.printStackTrace();
} //init
public BufferedImage capture(String path) {
// Grab a frame from the image device
FrameGrabbingControl frameGrabber = (FrameGrabbingControl) player.
getControl("javax.media.control.FrameGrabbingControl");
Buffer buf = frameGrabber.grabFrame();
// Convert frame to an buffered image so it can be processed and saved
Image img = (new BufferToImage( (VideoFormat) buf.getFormat()).createImage(
buf));
BufferedImage buffImg = new BufferedImage(img.getWidth(null), img.getHeight(null),
BufferedImage.TYPE_INT_RGB);
Graphics2D g = buffImg.createGraphics();
g.drawImage(img, null, null);
// Overlay curent time on image
// Save image to disk as PNG
try {
// ImageIO.write(buffImg, "png", new File(path));
System.out.println("images is saved "+new Date().toString());
catch (Exception ex2) {
return buffImg;
public void closeConn() {
// Stop using webcam
player.close();
player.deallocate();
System.exit(0);
public boolean motion(BufferedImage c, BufferedImage n) {
int crgb, nrgb;
int cav, nav;
for (int i = 0; i < c.getWidth(); i++) {
for (int j = 0; j < c.getHeight(); j++) {
crgb = c.getRGB(i, j);
nrgb = n.getRGB(i, j);
if (crgb != nrgb) {
return true;
return false;
public static void main(String[] args) throws Exception {
BufferedImage current;
camHandler test = new camHandler();
test.ini();
current = test.capture("c:\\webcam.png");
current = test.capture("c:\\webcam.png");
for (int i = 0; i < 30; i++) {
BufferedImage next = test.capture("c:\\webcam"+i+".png");
Thread.sleep(3000);
if (test.motion(current, next)) { // if motion is detected
System.out.println("Motion");
ImageIO.write(next, "png", new File("c:\\next"+i+".png"));
ImageIO.write(next, "png", new File("c:\\current"+i+".png"));
current = next;
test.closeConn();
PROBLEM: this.deviceInfo = CaptureDeviceManager.getDevice("vfw:Microsoft WDM Image Capture (Win32):0");
is returing null because my Web Camera is: Enter USB 2.0 PC CAMERA Model No: E-1.3MPIR
what should i pass inplace of "vfw:Microsoft WDM Image Capture (Win32):0"

Answer 1

this.deviceInfo = CaptureDeviceManager.getDevice("vfw://0");
vfw://0 is the default device. then you havent to know the name of the camera
Regards
- Stefan