我尝试使用Javafx和OpenCV通过无线访问网络摄像头（Axis M1013），为我的FRC团队运行视觉处理。当我运行我的代码时，我可以访问使用Scenebuilder创建的GUI，但是当我尝试启动相机时，程序崩溃了。在我看来，它似乎无法使用VideoCapture类。我知道我的问题不在于相机，因为我可以通过浏览器源访问Feed，而我的笔记本电脑的网络摄像头也能正常工作。我使用的是OpevCV版本2.4.13，jdk 8u101x64和ffmpeg 3.2
我查看过其他帖子：
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
我尝试了所有这些中提到的解决方案。到目前为止，没有人解决我的问题。
我的代码主要基于以下教程：
opencv-java-tutorials.readthedocs.io/en/latest/03-first-javafx-application-with-opencv.html
这是我的主要java代码：
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();
}
}
这是我的相机控制器：
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
当我尝试按照之前的说法运行时，GUI将启动，但是当我尝试打开相机时，我收到一条错误消息：
Private Sub TextBox46_Change()
If DataInput.TextBox46.Value > 0 And DataInput.TextBox46.Value < 1000 Then
DataInput.TextBox54.Value = 100 * ((DataInput.TextBox46.Value - DataInput.TextBox14.Value) / (DataInput.TextBox30.Value - DataInput.TextBox14.Value))
DataInput.TextBox62.Value = 100 - DataInput.TextBox54.Value
Else: MsgBox ("Revise Inputs")
End If
End Sub
如果有人可以帮助我，那将非常感激。
提前致谢。
答案 0 :(得分：0)
在你的主要java代码中，需要有这个：
public static void main(String[] args) {
// load the native OpenCV library
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
launch(args);
}