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補足説明　テストプログラムを作成して分かったこと

2020/04/16 03:16

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yk3125

スコア91

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@@ -143,3 +143,389 @@
         }
     }
+上記のPGでは分かりにくいかと思い、下記のようなテストプログラムを作りました。
+"切替"でカメラ１，２が切り替わるのですが、
+最初にVideoCapture cap = new VideoCapture(4);　を表示してから
+VideoCapture cap = new VideoCapture(0); を実行させないとカメラ２台の画像取得ができません。
+0と4を逆にするとダメでした。一応、不安定ですが動きました。
+raspberry pi4 の能力不足なのか動きはカクカクです。timeoutもでますが、しばらくすると表示もされます。
+やはりraspberry pi4でUSBカメラ２台はむりなのでしょうか。
+import java.awt.BorderLayout;
+import java.awt.EventQueue;
+import java.awt.Image;
+import java.awt.*;
+import javax.swing.JLabel;
+import javax.swing.JTabbedPane;
+import javax.imageio.ImageIO;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.border.EmptyBorder;
+import javax.swing.JButton;
+import javax.swing.AbstractAction;
+import java.awt.event.ActionEvent;
+import java.io.ByteArrayInputStream;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.TimerTask;
+import java.util.Timer;
+import javax.swing.Action;
+import org.opencv.core.Mat;
+import org.opencv.core.MatOfByte;
+import org.opencv.highgui.Highgui;
+import org.opencv.highgui.VideoCapture;
+public class usbCam01 extends JFrame {
+    private static JPanel contentPane;
+    private static ImageViewer picmain;
+    private final Action btnSetuzoku_click = new SwingAction();
+    private final Action btnTojiru_click = new SwingAction_1();
+    private static int pcnt = 0;
+    private static int mpgend = 0;
+    private static CamThread1  camth1;
+    private static CamThread2  camth2;
+    /**
+     * Launch the application.
+     */
+    public static void main(String[] args) {
+        // DB Sakusei
+        int rc = 0;
+         String s1 = System.getProperty("java.library.path");
+         System.out.println("+++" + s1);
+         s1 = System.getProperty("java.class.path");
+         System.out.println("***" + s1);
+        System.loadLibrary("opencv_java2413");
+        EventQueue.invokeLater(new Runnable() {
+            public void run() {
+                try {
+                    usbCam01 frame = new usbCam01();
+                    frame.setVisible(true);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
+        });
+    }
+    /**
+     * Create the frame.
+     */
+    public usbCam01() {
+        setTitle("USBCAMERA");
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setBounds(100, 100, 682, 580);
+        contentPane = new JPanel();
+        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
+        setContentPane(contentPane);
+        contentPane.setLayout(null);
+        JButton btnSetuzoku = new JButton("Setuzoku");
+        btnSetuzoku.setAction(btnSetuzoku_click);
+        btnSetuzoku.setBounds(22, 12, 117, 25);
+        contentPane.add(btnSetuzoku);
+        JButton btnTojiru = new JButton("切替");
+        btnTojiru.setAction(btnTojiru_click);
+        btnTojiru.setBounds(151, 12, 117, 25);
+        contentPane.add(btnTojiru);
+        picmain = new ImageViewer();
+        picmain.setBounds(22, 49, 640, 480);
+        contentPane.add(picmain);
+        picmain.setVisible(true);
+    }
+    private class SwingAction extends AbstractAction {
+        public SwingAction() {
+            putValue(NAME, "Setuzoku");
+            putValue(SHORT_DESCRIPTION, "Some short description");
+        }
+        public void actionPerformed(ActionEvent e) {
+            // USB CAMERA START
+            try {
+                // 1s Timer Event
+                mpgend=1;
+                camth1 = new CamThread1();
+                camth1.start();
+            }catch(Exception ex){
+                ex.printStackTrace();
+            }
+        }
+    }
+    private class SwingAction_1 extends AbstractAction {
+        // USB CAMERA END
+        public SwingAction_1() {
+            putValue(NAME, "切替");
+            putValue(SHORT_DESCRIPTION, "Some short description");
+        }
+        public void actionPerformed(ActionEvent e) {
+            if(mpgend == 1) { mpgend = 2; } else { mpgend = 1; }
+        }
+    }
+    private static class CamThread1 extends Thread {
+        public void run() {
+            try {
+                VideoCapture cap = new VideoCapture(4);
+                Thread.sleep(2000);
+                if (!cap.isOpened()) {
+                    System.out.println("Error Initializing USB Camera");
+                } else {
+                    System.out.println("USB1 Camera OK");
+                    Mat frame = new Mat();
+                    MatOfByte mem = new MatOfByte();
+                    while(cap.read(frame)){
+                        //cap.retrieve(frame);
+                        Highgui.imencode(".png", frame, mem);
+                        byte pic[] = mem.toArray();
+                        Image im = ImageIO.read(new ByteArrayInputStream(pic));
+                        if(pcnt == 5){
+                            camth2 = new CamThread2();
+                            camth2.start();
+                            mpgend = 1;
+                        }
+                        pcnt++;
+                        if(mpgend == 1) picmain.updateImage(im);
+                    }
+                    System.exit(0);
+                }
+            } catch (Exception ex) {
+                // TODO Auto-generated catch block
+                ex.printStackTrace();
+            }
+        }
+    }
+    private static class CamThread2 extends Thread {
+        public void run() {
+            try {
+                VideoCapture cap = new VideoCapture(0);
+                Thread.sleep(2000);
+                if (!cap.isOpened()) {
+                    System.out.println("Error Initializing USB Camera");
+                } else {
+                    System.out.println("USB2 Camera OK");
+                    Mat frame = new Mat();
+                    MatOfByte mem = new MatOfByte();
+                    while(cap.read(frame)){
+                         //cap.retrieve(frame);
+                         Highgui.imencode(".png", frame, mem);
+                         byte pic[] = mem.toArray();
+                         Image im = ImageIO.read(new ByteArrayInputStream(pic));
+                         if(mpgend == 2) picmain.updateImage(im);
+                    }
+                    System.exit(0);
+                }
+            } catch (Exception ex) {
+                // TODO Auto-generated catch block
+                ex.printStackTrace();
+            }
+        }
+    }
+}