Java VideoCapture.open方法代码示例

import org.opencv.videoio.VideoCapture; //导入方法依赖的package包/类
public void startDetecting() {
    capture = new VideoCapture();
    capture.open(0);
    Runnable frameGrabber = new Runnable() {

        @Override
        public void run() {
            // effectively grab and process a single frame
            grabFrame();
            // convert and show the frame
            //TODO trigger listener up here
        }
    };

    this.timer = Executors.newSingleThreadScheduledExecutor();
    this.timer.scheduleAtFixedRate(frameGrabber, 0, 20, TimeUnit.MILLISECONDS);
}
 

import org.opencv.videoio.VideoCapture; //导入方法依赖的package包/类
@Override
protected void init(final ProcessorInitializationContext context) {
	final List<PropertyDescriptor> descriptors = new ArrayList<PropertyDescriptor>();
	// descriptors.add(CAMERA);
	descriptors.add(FRAME_WIDTH);
	descriptors.add(FRAME_HEIGHT);

	this.descriptors = Collections.unmodifiableList(descriptors);

	final Set<Relationship> relationships = new HashSet<Relationship>();
	relationships.add(REL_SUCCESS);
	this.relationships = Collections.unmodifiableSet(relationships);

	OpenCV.loadShared();
	System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
	camera = new VideoCapture();
	camera.open(0);
	
}
 

import org.opencv.videoio.VideoCapture; //导入方法依赖的package包/类
/**
 * Constructs a new <code>USBCamera</code>
 * @param number the port number for the camera
 * @param fov the field of view of the camera in degrees
 */
public USBCamera(int number, double fov) {
	super(fov);
	
	this.number = number;
	
	vc = new VideoCapture();
	vc.open(this.number);
}
 

import org.opencv.videoio.VideoCapture; //导入方法依赖的package包/类
public static void main(String[] args)
{
	System.out.println("Hello, OpenCV");
    // Load the native library.
    System.loadLibrary("opencv_java244");

    VideoCapture camera = new VideoCapture(0);
    camera.open(0); //Useless
    if(!camera.isOpened()){
        System.out.println("Camera Error");
    }
    else{
        System.out.println("Camera OK?");
    }

    Mat frame = new Mat();

    //camera.grab();
    //System.out.println("Frame Grabbed");
    //camera.retrieve(frame);
    //System.out.println("Frame Decoded");

    camera.read(frame);
    System.out.println("Frame Obtained");

    /* No difference
    camera.release();
    */

    System.out.println("Captured Frame Width " + frame.width());

    Imgcodecs.imwrite("camera.jpg", frame);
    System.out.println("OK");
}
 

import org.opencv.videoio.VideoCapture; //导入方法依赖的package包/类
/**
 * Opens a new camera using openCV with a given frame width and height, 
 * and a compression quality.
 * <p>
 * Checks all available devices up to index 10 and adds them using
 * {@link CameraView#add(Camera)}.
 * </p>
 * 
 * @param name the name of the camera
 * @param current the device index from 0.
 * @param width the frame width
 * @param height the frame height
 * @param quality the compression quality
 * 
 * @throws RuntimeException if the camera could not be opened
 */
public CvMultiCamera(String name, int current, int width, int height, int quality) {
	super(name, null);
	capture = new VideoCapture();
	cams = checkCameras(capture, 10);
	if(current >= 0){
		capture.open(current);
		camIndex = current;
	}
	image = new Mat();
	buffer = new MatOfByte();
	compressParams = new MatOfInt(Imgcodecs.CV_IMWRITE_JPEG_QUALITY, quality);
	capture.set(Videoio.CAP_PROP_FRAME_WIDTH, width);
	capture.set(Videoio.CAP_PROP_FRAME_HEIGHT, height);
	
	this.height = height;
	this.width = width;
	this.quality = quality;
	
	Camera nullcam = null;
	
	for (int i = 0; i < cams.length; i++) {
		if(cams[i] >= 0){
			add(nullcam);
		}
	}
}
 

import org.opencv.videoio.VideoCapture; //导入方法依赖的package包/类
private static int[] checkCameras(VideoCapture cap, int max){
	int[] cams = new int[max];
	boolean end = false;
	for (int i = 0; i < max; i++) {
		if(!end){
			if(!cap.open(i)){
				cams[i] = -1;
				end = true;
			}else cams[i] = i;
			cap.release();
		}else cams[i] = -1;
	}
	return cams;
}
 

import org.opencv.videoio.VideoCapture; //导入方法依赖的package包/类
/**
 * Opens a new camera using openCV at a certain device index with 
 * a given frame width and height, and a compression quality.
 * 
 * @param cam the device index from 0.
 * @param width the frame width
 * @param height the frame height
 * @param quality the compression quality
 * 
 * @throws RuntimeException if the camera could not be opened
 */
public CvCamera(int cam, int width, int height, int quality){
	capture = new VideoCapture();
	capture.open(cam);
	if(!capture.isOpened())
		throw new RuntimeException("Unable to open camera " + cam);
	
	image = new Mat();
	buffer = new MatOfByte();
	compressParams = new MatOfInt(Imgcodecs.CV_IMWRITE_JPEG_QUALITY, quality);
	capture.set(Videoio.CAP_PROP_FRAME_WIDTH, width);
	capture.set(Videoio.CAP_PROP_FRAME_HEIGHT, height);
	
	camIndex = cam;
	this.quality = quality;
}
 

import org.opencv.videoio.VideoCapture; //导入方法依赖的package包/类
private void startCamera() {
    currentFrame = new Mat();
    modifiedFrame = new Mat();
    matOfByte = new MatOfByte();

    videoCapture = new VideoCapture();
    videoCapture.open(0);
    
    startFrameGrabbing();
}
 

import org.opencv.videoio.VideoCapture; //导入方法依赖的package包/类
VideoCap(){
    cap = new VideoCapture();
    cap.open(0);
}
 

import org.opencv.videoio.VideoCapture; //导入方法依赖的package包/类
public void calibration(VideoCapture capture, EyeDetection e) {

        initializeEvetything();
        /*
        System.out.println("Calibration time!");
        System.out.println("Open both your eyes for 2 seconds");
        */
        pressAnyKeyToContinue("Calibration time!\nOpen both your eyes for 2 seconds");

        boolean first_capture;
        first_capture = true;
        //capture.open(0); not sure may need

        /*
        if(capture.isOpened()) {
            capture.set(io.CV_CAP_PROP_FRAME_WIDTH, width);
            capture.set(io.CV_CAP_PROP_FRAME_HEIGHT, height);
        }
        */

        while(openEyesList.size() < 2) {

            if(!first_capture) {
                //System.out.println("Can you please repeat?");
                pressAnyKeyToContinue("Can you please repeat?");
            } else {
                first_capture = false;
            }

            if(capture.read(openEyesMat)) {
                openEyesList = e.eyeDetect(openEyesMat);
            }
        }
        e.filter(openEyesList);


        //System.out.println();
        pressAnyKeyToContinue("Nice, Now close your eyes for 2 seconds");
        capture.release();
        capture.open(0);
        first_capture = true;

        while(closedEyesList.size() < 2) {
            if(!capture.isOpened())
                capture.open(0);
            if(first_capture) {
                first_capture = false;
            } else {
                //System.out.println("Can you please repeat?");
                pressAnyKeyToContinue("Can you please repeat?");
            }

            if(capture.read(closedEyesMat)) {
                closedEyesList = e.eyeDetect(closedEyesMat);
            }
        }
        e.filter(closedEyesList);
        System.out.println();
        capture.release();
    }