Xiaohao talks about the use of camera in Java

On the eve of the Spring Festival, under the guidance of Chen Ge, some filter effects in the beauty camera were added, but the use of filter effects before was based on individual pictures, and our video is also composed of pictures frame by frame Composition, so when we want to complete the beauty camera, the first thing we need to learn is how to get the video (javaOpenCV library, or WebCamp). The following uses WebCamp as an example!

The functions to be implemented include but are not limited to: taking pictures, video acquisition, video recording, screenshots, face recognition, special effects. …

1. The writing of the main program mainly uses awt and swing components

package CL2.Draw0117.Video0123;
import javax.swing.*;
import java.awt.*;
public class VDraw {
    public void initt() {
        //Form settings
        JFrame jf = new JFrame();
        //Form size setting
        jf.setSize(810,900);
        //Form name setting
        jf.setTitle("Video camera capture");
        //exit process settings
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setLocationRelativeTo(null);
        //Form layout settings
        BorderLayout borderLayout=new BorderLayout();
        jf.setLayout(borderLayout);
        //Center form background setting
        JPanel center=new JPanel();
        center.setBackground(Color.white);
        jf.add(center,BorderLayout.CENTER);
        //The creation of the Vpixelmouse object is convenient for adding listeners
        Vpixelmouse mouse=new Vpixelmouse();
        //Menu Bar
        JMenuBar jmb = new JMenuBar();
        // Fix the position of the menu bar
        jf.add(jmb,BorderLayout.NORTH);
        // menu options
        JMenu jmn = new JMenu("Video");
        jmb.add(jmn);
        //Submenu
        JMenuItem jmi = new JMenuItem("Open");
        JMenuItem jmi2 = new JMenuItem("Close");
        jmn. add(jmi);
        jmn. add(jmi2);
        //Visibility must be in front of the brush
        jf.setVisible(true);
        mouse.g=center.getGraphics();
        //add listener
        jmi.addActionListener(mouse);
        jmi2.addActionListener(mouse);
    }
    public static void main(String[] args) {
        VDraw vDraw=new VDraw();
        vDraw.initt();
    }
}

2.

package CL2.Draw0117.Video0123;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class Vpixelmouse implements ActionListener {
    public Graphics g;
    // class to pass data
    public Vthreadpixel vp;
    public boolean flag;
    public void actionPerformed(ActionEvent e){
        String st = e.getActionCommand();
        if ("Open".equals(st)) {
            // Start multithreading
            // Create a thread object, showing that the thread is created once
            if (vp == null) {
                vp=new Vthreadpixel(g);
                // start the thread
                vp.start();
            }
        } else if ("Close".equals(st)) {
            vp.flag = false;
            System.out.println("Close");
        }
    }
    public int[][] getImagePixel(String path) {
        File file = new File(path);
        // ImageIO: I/O to image files
        // Get the buffered image
        BufferedImage buffImage = null;
        try {
            buffImage = ImageIO.read(file);
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        int w = buffImage.getWidth();
        int h = buffImage.getHeight();
        int[][] pixelArr = new int[w][h];
        // Get each pixel value in the picture and save it in a two-dimensional array
        for (int i = 0; i < w; i++) {
            for (int j = 0; j < h; j++) {
                int pixel = buffImage.getRGB(i, j);
                pixelArr[i][j] = pixel;
            }
        }
        return pixelArr;
    }
}

3. The use of multithreading

package CL2.Draw0117.Video0123;

import com.github.sarxos.webcam.Webcam;

import java.awt.*;
import java.awt.image.BufferedImage;

public class Vthreadpixel extends Thread {
    public Graphics g;
    / / control thread mark
    public boolean flag = true;
    //Initialize the brush object
    public Vthreadpixel(Graphics g) {
        this.g = g;
    }
    // The method of self-execution after starting the thread
    // After the run method is executed, the thread ends. Once the thread ends, it cannot be started again
    public void run() {
        System.out.println("Start thread.."+this.getName());
        // Start the camera and start it in the thread
        Webcam webcam=Webcam.getDefault();
        webcam.open();
        //
        while (flag) {
            // Get the data captured by the camera
            BufferedImage bufferedImage=webcam.getImage();
            // size setting
            g.drawImage(bufferedImage,100,100,400,300,null);
        }
    }
}

4. The effect is as shown in the figure