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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 && !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.

  • Revision 100728 : Pour le menu des rubriques complètes, si l’option "masquer l’article ...

    28 novembre 2016, par cy_altern@… — Log

    Pour le menu des rubriques complètes, si l’option "masquer l’article lorsqu’il n’y en a qu’un" est active, proposer de faire le lien vers l’article ce qui évite de passer par la page rubrique alors qu’elle ne contient qu’un article.

  • Revision 100529 : Éviter lorsqu’il n’y a pas de compression JS/CSS activée, que le ...

    16 novembre 2016, par marcimat@… — Log

    Éviter lorsqu’il n’y a pas de compression JS/CSS activée, que le navigateur redemande les fichiers css et js du porte plume qui sont compilés par SPIP.
    On ajoute cache-client sur le cache de ces fichiers. C’est presque suffisant, mais il faut aussi les recalculer lorsqu’un plugin qui modifie les fichiers
    de porte-plume s’active ou se désactive. Du coup, on calcule un hash et un fond statique pour ces 2 fichiers, qui dépend du code variable de ces fichiers.
    Bon du coup on peut éviter quelques hits sur le serveur, mais la contrepartie, c’est qu’il faut calculer ces hash, parfois inutilement j’imagine, au calcul d’une page.
    À voir.

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