Question

我正在尝试使用OpenCV库来学习JavaFX。我想制作一个能够检测人的程序。我们可以将它命名为人们反击。我已经看过一些视频了，我也想这样做。

问题是我必须开始学习JavaFX和库OpenCV。所以我开始创建一个简单的项目来启动/暂停网络摄像头并拍摄快照。我在youtube上看到有人这样做，我开始重新创建它。

问题是我有这个错误：

Exception in Application start method
java.lang.reflect.InvocationTargetException

我的代码是：

主要

package application;
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.fxml.FXMLLoader;


public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        try {
            BorderPane root = (BorderPane)FXMLLoader.load(getClass().getResource("Camera.fxml"));
            Scene scene = new Scene(root,400,400);
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
            primaryStage.setScene(scene);
            primaryStage.show();


        } catch(Exception e) {
            e.printStackTrace();
        }
    }

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

CameraController

package application;
 import java.awt.Graphics;
 import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import javax.imageio.ImageIO;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfByte;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.videoio.VideoCapture;

import javafx.embed.swing.SwingFXUtils;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.image.ImageView;

public class CameraController {
// definitions
@FXML
private Button btn_start;
@FXML
private Button btn_pause;
@FXML
private Button btn_snapshot;
@FXML
private ImageView imgView;

 private DaemonThread myThread = null;
    int count = 0;
    VideoCapture webSource = null;

    Mat frame = new Mat();
    MatOfByte mem = new MatOfByte(); /// start button 
    @FXML
    protected void startClick(ActionEvent event){
         webSource =new VideoCapture(0);
        myThread = new DaemonThread();
        Thread t = new Thread(myThread);
        t.setDaemon(true);
                  myThread.runnable = true;
                  t.start();
                 btn_start.setDisable(true);
                  btn_pause.setDisable(false); // stop button
    }
    @FXML
    protected void pauseClick(ActionEvent event){}
    @FXML
    protected void snapshotClick(ActionEvent event){}


    class DaemonThread implements Runnable
    {
    protected volatile boolean runnable = false;

    @Override
    public  void run()
    {
        synchronized(this)
        {
            while(runnable)
            {
                if(webSource.grab())
                {
                try
                        {
                            webSource.retrieve(frame);
                Imgcodecs.imencode(".bmp", frame, mem);
                Image im = ImageIO.read(new ByteArrayInputStream(mem.toArray()));

                BufferedImage buff = (BufferedImage) im;
                imgView.setImage(SwingFXUtils.toFXImage(buff, null));

                if(runnable == false)
                            {
                    System.out.println("Going to wait()");
                    this.wait();
                }
             }
             catch(Exception ex)
                         {
                System.out.println("Error");
                         }
                }
            }
        }
     }
    }
    /////////////////////////////////////////////////////////

}

问题在于这一行：

BorderPane root = (BorderPane)FXMLLoader.load(getClass().getResource("Camera.fxml"));
            Scene scene = new Scene(root,400,400);

完整控制台错误：

Exception in Application start method
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 com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    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.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.UnsatisfiedLinkError: org.opencv.core.Mat.n_Mat()J
    at org.opencv.core.Mat.n_Mat(Native Method)
    at org.opencv.core.Mat.<init>(Mat.java:24)
    at application.CameraController.<init>(CameraController.java:34)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at sun.reflect.misc.ReflectUtil.newInstance(Unknown Source)
    at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:927)
    at javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:971)
    at javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:220)
    at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:744)
    at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2707)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
    at application.Main.start(Main.java:15)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
    ... 1 more
Exception running application application.Main

提前谢谢！对不起可能重复.. :(

Answer 1

我修复了问题，只需添加

System.loadLibrary（Core.NATIVE_LIBRARY_NAME）;

public static void main(String[] args) {        
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME );
        launch(args);
    }

Answer 2

试试这个它对我有用 nu.pattern.OpenCV.loadShared();

JavaFX与OpenCV启动/暂停网络摄像头。 FXMLLoader

2 个答案: