在java中从网络摄像头捕获图像? [英] Capturing image from webcam in java?

问题描述

如何从网络摄像头连续捕捉图像?

How can I continuously capture images from a webcam?

我想尝试对象识别(通过使用 java 媒体框架).

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

我正在考虑创建两个线程

I was thinking of creating two threads

一个线程:

• 节点 1:捕获实时图像
• 节点 2:将图像另存为1.jpg"
• 节点 3:等待 5 秒
• 节点 4:重复...

其他线程:

• 节点 1:等待图像被捕获
• 节点 2:使用1.jpg"获取颜色来自每一个像素
• 节点 3:将数据保存在数组中
• 节点 4:重复...

推荐答案

这个 JavaCV 实现工作正常.

This JavaCV implementation works fine.

代码:

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();
    }
}

还有 关于 JavaCV 配置的帖子

您可以修改代码并能够定期保存图像并进行您想要的其余处理.

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

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