Windows系统使用javacv获取USB摄像头图像并保存
目：获取Windows系统笔记本自带摄像头，者连接Windows系统的usb摄像头视频画面，并保存图像到电脑。一、依赖库说明源码git地址：bytedeco/javacv: Java interface to OpenCV, FFmpeg, and more (github.com)https://github.com/bytedeco/javacvjavacv jar包下载地址：Releases
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目标：获取Windows系统笔记本自带摄像头，或者连接Windows系统的usb摄像头视频画面，并保存图像到电脑。
一、依赖库说明
javacv jar包下载地址：Releases · bytedeco/javacv (github.com)
https://github.com/bytedeco/javacv/releases
二、使用方法如下代码
类名：UvcCameraUtils
//package com.xx.xx
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.WindowConstants;
import org.bytedeco.javacv.CanvasFrame;
import org.bytedeco.javacv.Frame;
import org.bytedeco.javacv.FrameGrabber;
import org.bytedeco.javacv.Java2DFrameConverter;
import org.bytedeco.javacv.OpenCVFrameGrabber;
import org.bytedeco.javacv.VideoInputFrameGrabber;
import javax.swing.JOptionPane;
import org.bytedeco.javacv.FrameGrabber.Exception;
public class UvcCameraUtils {
public static int frameIndex = 0;
// videoDeviceName：USB/内置摄像头名称， 本例设成"Integrated Webcam"，是电脑内置摄像头名，可在设备管理器--相机，查看名称，此处以打开电脑内置摄像头为例。要打开USB摄像头，可插上摄像头后，在设备管理器中查看，并修改此变量值即可打开USB摄像头。
private static final String videoDeviceName = "Integrated Webcam";
/**以打开电脑内置摄像头为例**/
public static void showUvcCameraFrame() throws InterruptedException,
FrameGrabber.Exception {
// 0表示摄像头id
OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0);
grabber.start();//开始获取摄像头数据
CanvasFrame canvas = new CanvasFrame("电脑摄像头");//新建一个窗口
canvas.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
canvas.setAlwaysOnTop(true);
while (true) {
if (!canvas.isDisplayable()) {//窗口是否关闭
grabber.stop();//停止抓取
grabber.close();
System.exit(-1);//退出
}
Frame frame = grabber.grab();
canvas.showImage(frame);//获取摄像头图像并放到窗口上显示， 这里的Frame frame=grabber.grab(); frame是一帧视频图像
Thread.sleep(50);//50毫秒刷新一次图像
}
}
/**根据名称显示摄像头视频画面**/
public static void showUvcCameraFrame(boolean isSaveImage) throws FrameGrabber.Exception, InterruptedException {
frameIndex = 0;
int deviceIndex = -1;
// 获取设备名称
String[] deStrings = VideoInputFrameGrabber.getDeviceDescriptions();
if (deStrings != null && deStrings.length > 0) {
for (int i=0; i < deStrings.length; i++) {
System.out.println("descriptions index=" + i + ", value=" + deStrings[i]);
if (videoDeviceName.equals(deStrings[i])) {
deviceIndex = i;
break;
}
}
}
if (deviceIndex < 0) {
JOptionPane.showMessageDialog(null, "<html><font size=8>" + "没有找到指定设备");
return;
}
// 参数根据设备管理器中，Cameras下面，设备的摄像头排次，如果是第二个参数为1
VideoInputFrameGrabber grabber = VideoInputFrameGrabber.createDefault(deviceIndex);
// 摄像头画面宽高
grabber.setImageWidth(360);
grabber.setImageHeight(640);
// 图像格式
grabber.setFormat("YUY2");
grabber.start();
CanvasFrame canvasFrame = new CanvasFrame("摄像头：" + videoDeviceName);
canvasFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
canvasFrame.setAlwaysOnTop(true);
while (true) {
if (!canvasFrame.isDisplayable()) {
grabber.stop();
grabber.close();
System.exit(-1);
}
Frame frame = null;
try {
frame = grabber.grab();
} catch (Exception e) {
System.out.println("showUvcCameraFrame error=" + e.getMessage() + ", isSaveImage=" + isSaveImage);
}
if (frame != null) {
canvasFrame.showImage(frame);
// 在D盘保存两张图
if (isSaveImage && frameIndex < 2) {
writeFrameToFile(frame, "index_" + frameIndex);
frameIndex++;
}
}
Thread.sleep(30);
}
}
public static void writeFrameToFile(Frame frame, String fileNamePrefix) {
writeFrameToFile("D:\\", frame, fileNamePrefix);
}
public static void writeFrameToFile(String filePatn, Frame frame, String fileNamePrefix) {
if (filePatn == null || "".equals(filePatn)) {
return;
} else if (!isFileExist(filePatn)) {
File file = new File(filePatn);
file.mkdirs();
}
File targetFile = new File(filePatn + File.separator + fileNamePrefix + ".jpg");
String imgSuffix = "jpg";
Java2DFrameConverter converter = new Java2DFrameConverter();
BufferedImage srcBi = converter.getBufferedImage(frame);
int owidth = srcBi.getWidth();
int oheight = srcBi.getHeight();
int width = owidth;
int height = oheight;
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
Image image = srcBi.getScaledInstance(width, height, Image.SCALE_SMOOTH);
bi.getGraphics().drawImage(image, 0, 0, null);
try {
ImageIO.write(bi, imgSuffix, targetFile);
} catch (IOException e) {
System.out.println("writeFrameToFile image write error=" + e.getMessage()
+ ", frame=" + frame + ", fileNamePrefix=" + fileNamePrefix);
e.printStackTrace();
}
if (converter != null) {
converter.close();
}
}
/**从帧数据中获取Image对象**/
public static Image getImageFromFrame(Frame frame) {
Java2DFrameConverter converter = new Java2DFrameConverter();
BufferedImage srcBi = converter.getBufferedImage(frame);
int owidth = srcBi.getWidth();
int oheight = srcBi.getHeight();
// 对截取的帧进行等比例缩放
int width = owidth;
int height = oheight;// (int) (((double) width / owidth) * oheight);
Image image = srcBi.getScaledInstance(width, height, Image.SCALE_SMOOTH);
if (converter != null) {
converter.close();
}
return image;
}
/**文件是否存在**/
public static boolean isFileExist(String pathname) {
File file = new File(pathname);
return isFileExist(file);
}
/**文件是否存在**/
public static boolean isFileExist(File file) {
if (null != file) {
if (file.exists()) {
return true;
}
}
return false;
}
}
2022年11月1日------------------------------------------------------------------------------------------------------------
添加需要的jar包资源：javawindows桌面程序，显示usb相机预览需要的库-桌面系统文档类资源-CSDN文库
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