Java使用OpenCV3.2实现视频读取与播放

Java使用OpenCV3.2实现视频读取与播放

java使用OpenCV3.2实现视频读取与播放，供大家参考，具体内容如下

OpenCV从3.x版本开始其JAVA语言的SDK支持视频文件读写，这样就极大的方便了广大Java语言开发者学习与使用OpenCV，通过摄像头或者视频文件读取帧的内容与播放，完成视频内容分析与对象跟踪等各种应用开发任务。可以说OpenCV C++ SDK可以做到绝大多数事情，在OpenCV3.x版本上用Java都可以完成，这样就为很多Java开发者学习OpenCV打开了方便之门。

实现思路

首先用OpenCV相关API读取视频流或者视频文件的每一帧，然后通过Swing JComponent组件实现视频每一帧的更新显示，我模仿了C++的HIGHGUI里面创建窗口与显示图像接口，基于Swing实现了一个视频播放窗口类，把读取到的每一帧都传给它就可以实现连续显示即播放。每帧之间相隔100毫秒，我是通过Java线程Sleep方法实现。

运行效果 - USB摄像头读取每帧

运行效果 - 视频文件读取每帧

代码实现

视频文件读取

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);

// 打开摄像头或者视频文件

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视频读与播放演示", new Dimension(frame_width, frame_height));

Mat frame = new Mat();

while(true) {

boolean have = capture.read(frame);

Core.flip(frame, frame, 1);// Win上摄像头

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

for(int col=0; 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 );

}

}

视频与图像显示窗口类

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 serialVerCGQWnsionUID = 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();

}

}

for(int col=0; 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 );

}

}

视频与图像显示窗口类

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 serialVerCGQWnsionUID = 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();

}

}

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 );

}

}

视频与图像显示窗口类

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 serialVerCGQWnsionUID = 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();

}

}

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