openCV播放视频或调用摄像头-Java

openCV播放视频或调用摄像头

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.Scalar;
import org.opencv.highgui.HighGui;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.videoio.VideoCapture;
import org.opencv.imgproc.Imgproc;

public class ShowVedio {
	static{
	      System.load( "G:\\OpenCV\\opencv\\build\\java\\x64\\opencv_java430.dll");
	      }
	public static void main(String[] args) {
		VideoCapture camera=new VideoCapture();
		camera.release();
		camera.open(0,700);//设置700才行
		//camera.open("G:\\124.avi");//读取视频
		while(!camera.isOpened()) {
			System.out.println("摄像头未打开");
			try{
				Thread.sleep(1000);
			}
			catch(InterruptedException e){
				e.printStackTrace();
			}
		}
		System.out.println("摄像头成功开启");
		System.out.println("摄像机名字："+camera.getBackendName());
		Mat frame=new Mat();
		while(true){
				camera.read(frame);
				HighGui.imshow("OpenCV摄像头", frame);
				HighGui.waitKey(5);
				try{
					Thread.sleep(5);
				}
				catch(InterruptedException e){
					e.printStackTrace();
				}
		}
	}
}
           

若读取视频，必须将opencv目录下build/bin目录下的binopencv_videoio_ffmpeg430_64.dll那个dll文件复制到C：windows/system32。

apiPreference 接口的设备ID对应:

enum VideoCaptureAPIs {
       CAP_ANY          = 0,            //!< Auto detect == 0
       CAP_VFW          = 200,          //!< Video For Windows (platform native)
       CAP_V4L          = 200,          //!< V4L/V4L2 capturing support via libv4l
       CAP_V4L2         = CAP_V4L,      //!< Same as CAP_V4L
       CAP_FIREWIRE     = 300,          //!< IEEE 1394 drivers
       CAP_FIREWARE     = CAP_FIREWIRE, //!< Same as CAP_FIREWIRE
       CAP_IEEE1394     = CAP_FIREWIRE, //!< Same as CAP_FIREWIRE
       CAP_DC1394       = CAP_FIREWIRE, //!< Same as CAP_FIREWIRE
       CAP_CMU1394      = CAP_FIREWIRE, //!< Same as CAP_FIREWIRE
       CAP_QT           = 500,          //!< QuickTime
       CAP_UNICAP       = 600,          //!< Unicap drivers
       CAP_DSHOW        = 700,          //!< DirectShow (via videoInput)
       CAP_PVAPI        = 800,          //!< PvAPI, Prosilica GigE SDK
       CAP_OPENNI       = 900,          //!< OpenNI (for Kinect)
       CAP_OPENNI_ASUS  = 910,          //!< OpenNI (for Asus Xtion)
       CAP_ANDROID      = 1000,         //!< Android - not used
       CAP_XIAPI        = 1100,         //!< XIMEA Camera API
       CAP_AVFOUNDATION = 1200,         //!< AVFoundation framework for iOS (OS X Lion will have the same API)
       CAP_GIGANETIX    = 1300,         //!< Smartek Giganetix GigEVisionSDK
       CAP_MSMF         = 1400,         //!< Microsoft Media Foundation (via videoInput)
       CAP_WINRT        = 1410,         //!< Microsoft Windows Runtime using Media Foundation
       CAP_INTELPERC    = 1500,         //!< Intel Perceptual Computing SDK
       CAP_OPENNI2      = 1600,         //!< OpenNI2 (for Kinect)
       CAP_OPENNI2_ASUS = 1610,         //!< OpenNI2 (for Asus Xtion and Occipital Structure sensors)
       CAP_GPHOTO2      = 1700,         //!< gPhoto2 connection
       CAP_GSTREAMER    = 1800,         //!< GStreamer
       CAP_FFMPEG       = 1900,         //!< Open and record video file or stream using the FFMPEG library
       CAP_IMAGES       = 2000,         //!< OpenCV Image Sequence (e.g. img_%02d.jpg)
       CAP_ARAVIS       = 2100,         //!< Aravis SDK
       CAP_OPENCV_MJPEG = 2200,         //!< Built-in OpenCV MotionJPEG codec
       CAP_INTEL_MFX    = 2300,         //!< Intel MediaSDK
       CAP_XINE         = 2400,         //!< XINE engine (Linux)
     };