javacv开发包是用于支持java多媒体开发的一套开发包,能够适用于本地多媒体(音视频)调用以及音视频,图片等文件后期操做(图片修改,音视频解码剪辑等等功能)。java
这些须要引入的包。音视频处理使用ffmpeg,图像处理使用opencv,摄像头抓取使用opencvcanvas
一、读取摄像头的图像dom
public class JavavcCameraTest{ public static void main(String[] args) throws Exception, InterruptedException{ OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0); grabber.start(); //开始获取摄像头数据 CanvasFrame canvas = new CanvasFrame("摄像头");//新建一个窗口 canvas.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); canvas.setAlwaysOnTop(true); while(true){ if(!canvas.isDisplayable()){//窗口是否关闭 grabber.stop();//中止抓取 System.exit(2);//退出 break; } canvas.showImage(grabber.grab());//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(200);//50毫秒刷新一次图像 } } }
效果:spa
二、截取摄像头都画面并保存下来code
public class JavavcCameraTest { static OpenCVFrameConverter.ToIplImage converter = new OpenCVFrameConverter.ToIplImage(); public static void main(String[] args) throws Exception, InterruptedException { OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0); grabber.start(); //开始获取摄像头数据 CanvasFrame canvas = new CanvasFrame("摄像头");//新建一个窗口 canvas.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); canvas.setAlwaysOnTop(true); int ex = 0; while(true) { if(!canvas.isDisplayable()) {//窗口是否关闭 grabber.stop();//中止抓取 System.exit(2);//退出 break; } canvas.showImage(grabber.grab());//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 opencv_core.Mat mat = converter.convertToMat(grabber.grabFrame()); ex++; opencv_imgcodecs.imwrite("d:\\img\\" + ex + ".png", mat); Thread.sleep(200);//50毫秒刷新一次图像 } } }
grabber.grab()和grabber.grabFrame()均可以得到当时摄像头的图像,但都是Frame类型的图像,想要保存须要先调用penCVFrameConverter.ToIplImage的convertToMat转换为mat类型,而后调用opencv_imgcodecs.imwrite()方法进行保存。视频
效果:blog
三、截取视频的画面图片
public abstract class FrameGrabberKit { public static void main(String[] args) throws Exception { String inputFilePth = "C:\\Users\\Administrator\\Desktop\\a.mp4"; randomGrabberFFmpegImage(inputFilePth, 5); } public static void randomGrabberFFmpegImage(String filePath, int randomSize) throws Exception { FFmpegFrameGrabber ff = FFmpegFrameGrabber.createDefault(filePath); ff.start(); int ffLength = ff.getLengthInFrames(); List<Integer> randomGrab = random(ffLength, randomSize); int maxRandomGrab = randomGrab.get(randomGrab.size() - 1); Frame f; int i = 0; while (i < ffLength) { f = ff.grabImage(); if (randomGrab.contains(i)) { doExecuteFrame(f, i); } if (i >= maxRandomGrab) { break; } i++; } ff.stop(); } public static void doExecuteFrame(Frame f, int index) { if (null == f || null == f.image) { return; } OpenCVFrameConverter.ToIplImage converter = new OpenCVFrameConverter.ToIplImage(); String imageMat = "png"; String FileName = "D:\\img"; opencv_core.Mat mat = converter.convertToMat(f); opencv_imgcodecs.imwrite("d:\\img\\" + index + "sls.png", mat);//存储图像 } public static List<Integer> random(int baseNum, int length) { List<Integer> list = new ArrayList<>(length); while (list.size() < length) { Integer next = (int) (Math.random() * baseNum); if (list.contains(next)) { continue; } list.add(next); } Collections.sort(list); return list; } }
inputFilePth是视频的路径。这里随机挑了5个画面的图像存储下来。开发
效果:get