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  • Unable to Access IP Camera in OpenCV

    3 janvier 2017, par user7258890

    I’m trying to use Javafx and OpenCV to access a webcam (Axis M1013) over wireless to run vision processing for my FRC team. When I run my code, I can access the GUI that I made using Scenebuilder, but when I try to start the camera, the program crashes. It seems to me like it’s having trouble utilizing the VideoCapture class. I know for a fact that my problem is not with the camera, because i can access the feed through a browser feed, and my laptop’s webcam will work fine. I’m using OpevCV version 2.4.13, jdk 8u101x64, and ffmpeg 3.2

    I have looked at other posts at :

    stackoverflow.com/questions/18625948/opencv-java-unsatisfiedlinkerror

    answers.opencv.org/question/21720/java-webcam-capture

    answers.opencv.org/question/20071/unsatisfiedlinkerror-given-by-highghuiimread-on-java

    I have tried the solutions mentioned in all of these. So far, none have resolved my problem.

    My code is based mostly off the tutorials at :

    opencv-java-tutorials.readthedocs.io/en/latest/03-first-javafx-application-with-opencv.html

    Here is my main java code :

        @Override 
    
public void start(Stage primaryStage) {
    
    System.load("C:\\opencv\\build\\x64\\vc12\\bin\\opencv_ffmpeg_64.dll");
    
    try {
    
        FXMLLoader loader = new FXMLLoader(getClass().getResource("Sample.fxml"));
    
        BorderPane root = (BorderPane) loader.load();
    
        Scene scene = new Scene(root, 400, 400);
    
        scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
    
        primaryStage.setScene(scene);
    
        primaryStage.show();
    
    } catch(Exception e) {
    
        System.out.println("error opening camera gui");
    
    }
    
}
    

    
public static void main(String[] args) {
    
    launch(args);
    
}

    And here is my camera controller :

    public class SampleController {
    
@FXML
    
private Button Start_btn;
    

    
@FXML
    
private ImageView currentFrame;
    
private ScheduledExecutorService timer;
    
private VideoCapture capture;
    
private boolean cameraActive = false;
    

    
@FXML
    
public void startCamera()
    
{
    
    System.loadLibrary("opencv_ffmpeg_64");
    
    if (!this.cameraActive)
    
    {
    
        try
    
        {
    
         capture = new VideoCapture("http://FRC:FRC@axis-camera-223-catapult.lan:554/mjpg/1/video.mjpg");
    
        }
    
        catch (Exception e)
    
        {
    
            System.out.println("an error occured when attempting to access camera.");
    
        }
    
        // is the video stream available?
    
        if (this.capture.isOpened())
    
        {
    
            this.cameraActive = true;
    

    
            // grab a frame every 33 ms (30 frames/sec)
    
            Runnable frameGrabber = new Runnable() {
    

    
                @Override
    
                public void run()
    
                {
    
                    // effectively grab and process a single frame
    
                    Mat frame = grabFrame();
    
                    // convert and show the frame
    
                    Image imageToShow = Utils.mat2Image(frame);
    
                    updateImageView(currentFrame, imageToShow);
    
                }
    
            };
    

    
            this.timer = Executors.newSingleThreadScheduledExecutor();
    
            this.timer.scheduleAtFixedRate(frameGrabber, 0, 33, TimeUnit.MILLISECONDS);
    

    
            // update the button content
    
            this.Start_btn.setText("Stop Camera");
    
        }
    
        else
    
        {
    
            // log the error
    
            System.err.println("Impossible to open the camera connection...");
    
        }
    
    }
    
    else
    
    {
    
        // the camera is not active at this point
    
        this.cameraActive = false;
    
        // update again the button content
    
        this.Start_btn.setText("Start Camera");
    

    
        // stop the timer
    
        this.stopAquisition();
    
    }
    

    
    System.out.println("Camera is now on.");
    
}
    

    
/**
    
 * Get frame from open video
    
 * @return
    
 */
    
    private Mat grabFrame()
    

    
    {
    
        Mat frame = new Mat();
    
        if (this.capture.isOpened())
    
        {
    
            try
    
            {
    
                this.capture.read(frame);
    

    
                }
    
        catch (Exception e)
    
        {
    
            System.err.println("Exception during the image elaboration: " + e);
    
        }
    
    }
    
    return frame;
    
}
    
    private void stopAquisition()
    
    {
    
        if (this.timer!=null &amp;&amp; !this.timer.isShutdown())
    
        {
    
            try
    
            {
    
                this.timer.shutdown();
    
                this.timer.awaitTermination(33, TimeUnit.MILLISECONDS);
    
            }
    
            catch (InterruptedException e)
    
            {
    
                System.err.println("Exception in stopping the frame capture, trying to release camera now..." + e);
    

    
            }
    
        }
    
        if (this.capture.isOpened())
    
        {
    
            this.capture.release();
    
        }
    
    }
    
    private void updateImageView(ImageView view, Image image)
    
    {
    
        Utils.onFXThread(view.imageProperty(), image);
    
    }
    
    protected void setClosed()
    
    { 
    
        this.stopAquisition();
    
    }
    
}

    When I try and run this as i have said before, the GUI will launch, but when i try and open the camera, i get an error message :

    Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
    
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
    
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
    
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
    
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
    
at javafx.event.Event.fireEvent(Event.java:198)
    
at javafx.scene.Node.fireEvent(Node.java:8411)
    
at javafx.scene.control.Button.fire(Button.java:185)
    
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
    
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
    
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
    
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
    
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
    
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
    
at javafx.event.Event.fireEvent(Event.java:198)
    
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
    
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
    
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
    
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
    
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:380)
    
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294)
    
at java.security.AccessController.doPrivileged(Native Method)
    
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416)
    
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415)
    
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    
at com.sun.glass.ui.View.notifyMouse(View.java:937)
    
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
    
at java.lang.Thread.run(Unknown Source)
    
Caused by: java.lang.reflect.InvocationTargetException
    
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    
at java.lang.reflect.Method.invoke(Unknown Source)
    
at sun.reflect.misc.Trampoline.invoke(Unknown Source)
    
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    
at java.lang.reflect.Method.invoke(Unknown Source)
    
at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
    
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
    
... 48 more
    
Caused by: java.lang.UnsatisfiedLinkError:     org.opencv.highgui.VideoCapture.VideoCapture_1(Ljava/lang/String;)J
    
at org.opencv.highgui.VideoCapture.VideoCapture_1(Native Method)
    
at org.opencv.highgui.VideoCapture.<init>(VideoCapture.java:128)
    
at jfxtest1.SampleController.startCamera(SampleController.java:36)
    
... 58 more
    
</init>

    If anyone can help me, that would be much appreciated.

    Thanks in advance.

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