Capturing image from webcam in java?

Question

How can I continuously capture images from a webcam?

I want to experiment with object recognition (by maybe using java media framework).

I was thinking of creating two threads

one thread:

• Node 1: capture live image
• Node 2: save image as "1.jpg"
• Node 3: wait 5 seconds
• Node 4: repeat...

other thread:

• Node 1: wait until image is captured
• Node 2: using the "1.jpg" get colors from every pixle
• Node 3: save data in arrays
• Node 4: repeat...

Answer 1

This JavaCV implementation works fine.

Code:

import org.bytedeco.javacv.*;
import org.bytedeco.opencv.opencv_core.IplImage;

import java.io.File;

import static org.bytedeco.opencv.global.opencv_core.cvFlip;
import static org.bytedeco.opencv.helper.opencv_imgcodecs.cvSaveImage;

public class Test implements Runnable {
    final int INTERVAL = 100;///you may use interval
    CanvasFrame canvas = new CanvasFrame("Web Cam");

    public Test() {
        canvas.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
    }

    public void run() {

        new File("images").mkdir();

        FrameGrabber grabber = new OpenCVFrameGrabber(0); // 1 for next camera
        OpenCVFrameConverter.ToIplImage converter = new OpenCVFrameConverter.ToIplImage();
        IplImage img;
        int i = 0;
        try {
            grabber.start();

            while (true) {
                Frame frame = grabber.grab();

                img = converter.convert(frame);

                //the grabbed frame will be flipped, re-flip to make it right
                cvFlip(img, img, 1);// l-r = 90_degrees_steps_anti_clockwise

                //save
                cvSaveImage("images" + File.separator + (i++) + "-aa.jpg", img);

                canvas.showImage(converter.convert(img));

                Thread.sleep(INTERVAL);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Test gs = new Test();
        Thread th = new Thread(gs);
        th.start();
    }
}

There is also post on configuration for JavaCV

You can modify the codes and be able to save the images in regular interval and do rest of the processing you want.