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Java使用OpenCV3.2實(shí)現(xiàn)視頻讀取與播放

更新時(shí)間：2019年07月24日 12:52:50 作者：gloomyfish

這篇文章主要為大家詳細(xì)介紹了Java使用OpenCV3.2實(shí)現(xiàn)視頻讀取與播放，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

Java使用OpenCV3.2實(shí)現(xiàn)視頻讀取與播放，供大家參考，具體內(nèi)容如下

OpenCV從3.x版本開(kāi)始其JAVA語(yǔ)言的SDK支持視頻文件讀寫，這樣就極大的方便了廣大Java語(yǔ)言開(kāi)發(fā)者學(xué)習(xí)與使用OpenCV，通過(guò)攝像頭或者視頻文件讀取幀的內(nèi)容與播放，完成視頻內(nèi)容分析與對(duì)象跟蹤等各種應(yīng)用開(kāi)發(fā)任務(wù)?？梢哉f(shuō)OpenCV C++ SDK可以做到絕大多數(shù)事情，在OpenCV3.x版本上用Java都可以完成，這樣就為很多Java開(kāi)發(fā)者學(xué)習(xí)OpenCV打開(kāi)了方便之門。

實(shí)現(xiàn)思路

首先用OpenCV相關(guān)API讀取視頻流或者視頻文件的每一幀，然后通過(guò)Swing JComponent組件實(shí)現(xiàn)視頻每一幀的更新顯示，我模仿了C++的HIGHGUI里面創(chuàng)建窗口與顯示圖像接口，基于Swing實(shí)現(xiàn)了一個(gè)視頻播放窗口類，把讀取到的每一幀都傳給它就可以實(shí)現(xiàn)連續(xù)顯示即播放。每幀之間相隔100毫秒，我是通過(guò)Java線程Sleep方法實(shí)現(xiàn)。

運(yùn)行效果 - USB攝像頭讀取每幀

運(yùn)行效果 - 視頻文件讀取每幀

代碼實(shí)現(xiàn)

視頻文件讀取

package com.gloomyfish.video.demo;

import java.awt.Dimension;
import java.awt.image.BufferedImage;

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.videoio.VideoCapture;

public class VideoDemo {

  public static void main(String[] args) {
    System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
    // 打開(kāi)攝像頭或者視頻文件
    VideoCapture capture = new VideoCapture();
    //capture.open(0);
    capture.open("D:/vcprojects/images/768x576.avi");
    if(!capture.isOpened()) {
      System.out.println("could not load video data...");
      return;
    }
    int frame_width = (int)capture.get(3);
    int frame_height = (int)capture.get(4);
    ImageGUI gui = new ImageGUI();
    gui.createWin("OpenCV + Java視頻讀與播放演示", new Dimension(frame_width, frame_height));
    Mat frame = new Mat();
    while(true) {
      boolean have = capture.read(frame);
      Core.flip(frame, frame, 1);// Win上攝像頭
      if(!have) break;
      if(!frame.empty()) {
        gui.imshow(conver2Image(frame));
        gui.repaint();
      }
      try {
        Thread.sleep(100);
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }

  }

  public static BufferedImage conver2Image(Mat mat) {
    int width = mat.cols();
    int height = mat.rows();
    int dims = mat.channels();
    int[] pixels = new int[width*height];
    byte[] rgbdata = new byte[width*height*dims];
    mat.get(0, 0, rgbdata);
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
    int index = 0;
    int r=0, g=0, b=0;
    for(int row=0; row<height; row++) {
      for(int col=0; col<width; col++) {
        if(dims == 3) {
          index = row*width*dims + col*dims;
          b = rgbdata[index]&0xff;
          g = rgbdata[index+1]&0xff;
          r = rgbdata[index+2]&0xff;
          pixels[row*width+col] = ((255&0xff)<<24) | ((r&0xff)<<16) | ((g&0xff)<<8) | b&0xff; 
        }
        if(dims == 1) {
          index = row*width + col;
          b = rgbdata[index]&0xff;
          pixels[row*width+col] = ((255&0xff)<<24) | ((b&0xff)<<16) | ((b&0xff)<<8) | b&0xff; 
        }
      }
    }
    setRGB( image, 0, 0, width, height, pixels);
    return image;
  }

  /**
   * A convenience method for setting ARGB pixels in an image. This tries to avoid the performance
   * penalty of BufferedImage.setRGB unmanaging the image.
   */
  public static void setRGB( BufferedImage image, int x, int y, int width, int height, int[] pixels ) {
    int type = image.getType();
    if ( type == BufferedImage.TYPE_INT_ARGB || type == BufferedImage.TYPE_INT_RGB )
      image.getRaster().setDataElements( x, y, width, height, pixels );
    else
      image.setRGB( x, y, width, height, pixels, 0, width );
  }

}

視頻與圖像顯示窗口類

package com.gloomyfish.video.demo;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;

import javax.swing.JComponent;
import javax.swing.JDialog;

public class ImageGUI extends JComponent {
  /**
   * 
   */
  private static final long serialVersionUID = 1L;
  private BufferedImage image;

  public ImageGUI() {

  }

  @Override
  protected void paintComponent(Graphics g) {
    Graphics2D g2d = (Graphics2D)g;
    if(image == null) {
      g2d.setPaint(Color.BLACK);
      g2d.fillRect(0, 0, this.getWidth(), this.getHeight());
    } else {
      g2d.drawImage(image, 0, 0, this.getWidth(), this.getHeight(), null);
      System.out.println("show frame...");
    }
  }

  public void createWin(String title) {
    JDialog ui = new JDialog();
    ui.setTitle(title);
    ui.getContentPane().setLayout(new BorderLayout());
    ui.getContentPane().add(this, BorderLayout.CENTER);
    ui.setSize(new Dimension(330, 240));
    ui.setVisible(true);
  }

  public void createWin(String title, Dimension size) {
    JDialog ui = new JDialog();
    ui.setTitle(title);
    ui.getContentPane().setLayout(new BorderLayout());
    ui.getContentPane().add(this, BorderLayout.CENTER);
    ui.setSize(size);
    ui.setVisible(true);
  }

  public void imshow(BufferedImage image) {
    this.image = image;
    this.repaint();
  }

}

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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