Stereo vision interlaced or page flipping by j3d. Help me!

[java3d-interest]

Hi all,
I'm a student of University of Federico II, Naples (ITALY).
Should I build an application that transforms the image left and right image (taken from two cameras) in the stereoscopic image. I would like to have a single image which should give the feeling of depth.
I understand that the techniques used are the technique of interlace and page flipping.
If someone can give me some information on how to transform the two images in stereoscopic image.
Can I implement this kind of stereoscopic vision with java 3d?
My graphics card is a Nvidia Quadro FX 5500 and I use a CRT monitor on which I would like to see the stereoscopic image. I use LCD shutter glasses and an emitter synchronized with the monitor.
I have no experience with stereoscopy.
I hope someone can help me.
I'm sorry for my English.
Thanks very much for any help.

The  Best Regards

Raffaele Califano
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[java3d-interest]

The answer to your question can be found here:

http://forums.java.net/jive/thread.jspa?messageID=344437񔅵
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[java3d-interest]

Hi ruinter,
thank you very much for your fast answer, I am very grateful.
But the my shutter glasses are not filter red/cyan and therefore I'm interest to stereo interlaced or pafge flipping. Excuse me if I was not precise.
I'm looking your link for information and I hope that it helps me.
If you have any information tell me also.
Tahnk you very much in advance.

Raffaele Califano
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[java3d-interest]

For shutter glasses it's even easier since Java3D has built-in mechanism for that. For example you can run the sample HelloUniverse in stereo mode by running it like this:

java -Dj3d.stereo=PREFERRED HelloUniverse


You can find more info about that here:

http://java3d.j3d.org/faq/stereo.html
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[java3d-interest]

Excuse me if  I am boring, but I'm looking for some examples to see a interlaced image in stereo mode.
I now enable the graphics card to display the stereo, but the interlaced image (constructed of rows of the left image and with the odd rows of the right image) not seen with stereo glasses, but I see it like without glasses.
This is my code, it is the class for stereo vision:
(The image is the interlaced image)

import java.awt.Color;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.Toolkit;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.image.BufferedImage;

import javax.media.j3d.Appearance;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.GraphicsConfigTemplate3D;
import javax.media.j3d.GraphicsContext3D;
import javax.media.j3d.J3DGraphics2D;
import javax.media.j3d.View;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

import com.sun.j3d.utils.universe.SimpleUniverse;


public class StereoView extends JFrame implements Runnable {
        private SimpleUniverse univ = null;
        private Canvas3D canvas;
        private GraphicsContext3D gc = null;
        private J3DGraphics2D g2d = null;
        private BufferedImage image3d = null;
       private int xSize = 0;  
       private int ySize = 0;
       // Set this to true when the graphics card use shared z buffer
       // in stereo mode.
       public static String defaultSharedStereoZbuffer = Boolean.TRUE.toString();
       private boolean sharedStereoZbuffer;
       private boolean stereoSupport;  
       

        //
        // Renders a single frame by clearing the canvas, drawing the
        // geometry, and swapping the draw and display buffer.
        //
        public void render() {
                if (gc == null) {
                        // Set up Graphics context
                        gc = canvas.getGraphicsContext3D();
                        gc.setAppearance(new Appearance());
                        gc.setBufferOverride(true);
                }
                if (stereoSupport) {    
                        if (!sharedStereoZbuffer) {
                            gc.setStereoMode(GraphicsContext3D.STEREO_BOTH);    
                            // This clear both left and right buffers, we
                            // must set STEREO_BOTH before it. Otherwise
                            // it only clear LEFT or RIGHT buffer unless
                            // this is invoke twice for each buffer.
                            gc.clear();
                        }
                }
                gc.clear();
                if (g2d == null)
                        g2d = canvas.getGraphics2D();
                g2d.drawImage(image3d, (xSize-image3d.getWidth())/2, (ySize-image3d.getHeight())/2,
                                (xSize-image3d.getWidth())/2+image3d.getWidth(), (ySize-image3d.getHeight())/2+image3d.getHeight(),
                                0, 0, image3d.getWidth(), image3d.getHeight(), this);
                g2d.flush(false);
                canvas.swap();
        }

        //
        // Run method for our immediate mode rendering thread.
        //
        public void run() {
                System.out.println("SterioView.run: starting main loop");
                while (true) {
                        render();
                        Thread.yield();
                }
        }


        private void createUniverse() {
                // Get the preferred graphics configuration for the default screen
                GraphicsConfigTemplate3D gct = new GraphicsConfigTemplate3D();
        gct.setStereo(GraphicsConfigTemplate3D.PREFERRED);
        GraphicsConfiguration config =
            GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getBestConfiguration(gct);
                // Create a Canvas3D using the preferred configuration
                canvas = new Canvas3D(config);
                stereoSupport = canvas.getStereoAvailable();
                if (stereoSupport)
                {
                        System.out.println("This machine support stereo");
                        String str = System.getProperty("j3d.sharedstereozbuffer",
                                        defaultSharedStereoZbuffer);
                        sharedStereoZbuffer = (new Boolean(str)).booleanValue();
                }
                else
                {
                        JOptionPane.showMessageDialog(null, "Stereo is not support","Attenzione",JOptionPane.WARNING_MESSAGE);
                }

                if (!canvas.getDoubleBufferAvailable())
                {
                    System.out.println("Double buffer is not support !");
                }
                canvas.setBackground(Color.black);
        canvas.addKeyListener(new KeyAdapter(){
        public void keyPressed(KeyEvent e)
        {
        if (e.getKeyCode()==KeyEvent.VK_ESCAPE)
        {
        dispose();
        }
        }
        });
                canvas.stopRenderer();
                // Create simple universe with view branch
                univ = new SimpleUniverse(canvas);

                // This will move the ViewPlatform back a bit so the
                // objects in the scene can be viewed.
                univ.getViewingPlatform().setNominalViewingTransform();

                // Ensure at least 5 msec per frame (i.e., < 200Hz)
                univ.getViewer().getView().setMinimumFrameCycleTime(5);
        }

       
        public StereoView(BufferedImage image3d) {
                this.image3d = image3d;
                // Initialize the GUI components
                initComponents();

                // Create Canvas3D and SimpleUniverse; add canvas to JFrame
                createUniverse();
                this.add(canvas);
       
                // Start a new thread that will continuously render
                new Thread(this).start();
        }

        private void initComponents() {
        this.setUndecorated(true);
        Toolkit tk = Toolkit.getDefaultToolkit();  
        xSize = ((int) tk.getScreenSize().getWidth());  
        ySize = ((int) tk.getScreenSize().getHeight());  
        this.setSize(xSize,ySize);
        this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        }
}
 
Can you suggest me any trick?
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[java3d-interest]

I wouldn't be able to help you much on this topic since I never done stereo myself and don't have access to stereo glasses either.
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[java3d-interest]

(my previous post just disappeared. I 'll post it again, so sorry if appears twice.)

Use a NVidia Quadro class video card for Stereo.
Quadro allows windowed 3D stereo, as well on full screen mode.
Quadro FX 370 is entry model, and is not very expensive.

Use page flipping with shutter glasses.
DLP projetion *may* require inverting Left<->Right eye on video card driver control panel.
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[java3d-interest]

Excuse me, but with java 3d is possible implement stereoscopic page flipping? I need of information or example code.
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[java3d-interest]

>but with java 3d is possible implement stereoscopic page flipping?

Yes, of course ! Java3D uses OpenGL quad-buffer API for 3D stereo.
Quad buffer uses page flipping for switching left <-> right eye color buffer image.
Quad buffer stereo is available on professional OpenGL video cards as AMD/ATI FireGL and NVidia Quadro.

> I need of information or example code.

See below:
[code]

// create GraphConfig template  for stereo
GraphicsConfigTemplate3D template = new GraphicsConfigTemplate3D();
// PREFERRED uses stereo, IFF available. If stereo is not available, it falls back to
// monoscopic view.
template.setStereo(GraphicsConfigTemplate3D.PREFERRED);

// check system
GraphicsConfiguration conf = GraphicsEnvironment
.getLocalGraphicsEnvironment()
.getDefaultScreenDevice()
                                .getBestConfiguration(template);

// check if conf is OK
if (conf == null){
  throw new Exception("Graphics mode unsupported");
}

// create Canvas.
Canvas3D canvas = new Canvas3D( conf ) ;

[/code]

best luck ;)
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[java3d-interest]

Hello zesharp,
thank you for your answer.
Your code is similar my. I know how enable stereo mode, but I don't know how to display the left and right image by page flipping.
My function doesn't work, it is:

[code]
public void render() {
                if (gc == null) {
                        // Set up Graphics context
                        gc = canvas.getGraphicsContext3D();
                        gc.setAppearance(new Appearance());
                        gc.setBufferOverride(true);
                }
                gc.setStereoMode(GraphicsContext3D.STEREO_BOTH);
                gc.clear();
                if (g2d == null)
                        g2d = canvas.getGraphics2D();
                gc.setStereoMode(GraphicsContext3D.STEREO_LEFT);
                g2d.drawAndFlushImage(imageLeft, (xSize-imageLeft.getWidth())/2, (ySize-imageLeft.getHeight())/2, null);
                gc.setStereoMode(GraphicsContext3D.STEREO_RIGHT);
                g2d.drawAndFlushImage(imageRight, (xSize-imageLeft.getWidth())/2, (ySize-imageLeft.getHeight())/2, null);
                gc.flush(true);
                canvas.swap();
        }
[/code]

Can you give me any suggestion?
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[java3d-interest]

Hi !

For ordinary 3D stereo use you don't have to worry about overriding Canvas.
This is a straight forward operation:

1) create a Canvas with Stereo set as  preferred;
2) call canvas3d.setStereoEnable(true) and your screen starts flicking stereo immediately;

Or are you trying to use java3D to show static 2D stereo images  ?
 I guess there are some demos of this, but must google it.

In this case, I guess you must override Canvas.renderField(int) method.
Please read Canvas3D javadocs  :

[code]
The basic Java 3D stereo rendering loop, executed for each Canvas3D, is as follows:

 clear canvas (both eyes)
 call preRender()                           // user-supplied method
 set left eye view
 render opaque scene graph objects
 call renderField(FIELD_LEFT)               // user-supplied method
 render transparent scene graph objects
 set right eye view
 render opaque scene graph objects again
 call renderField(FIELD_RIGHT)              // user-supplied method
 render transparent scene graph objects again
 call postRender()                          // user-supplied method
 synchronize and swap buffers
 call postSwap()                            // user-supplied method

[/code]

By the way, use a Nvidia Quadro . It save you a LOT of headache and pay itself in a couple of man-hours .
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[java3d-interest]

Hi zesharp,
thank you for your answer.
I try to implement your second suggestion.
I will inform you about the resutl.
Thank you very much.

Raffaele
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[java3d-interest]

I didn't resolve my problem...
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[java3d-interest]

>>build an application that transforms the image left and right image (taken from two cameras) in the stereoscopic image. I would like to have a single image which should give the feeling of depth.

>I didn't resolve my problem...

What have you done, so far ?
Are those images static or is it a live shot from web cam ?
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[java3d-interest]

Hi zesharp,
the images are static... I now resolved my problem but I must perform the application.
I see the stereo image with sgutter glasses but when I leave from screen the image (in particular the widgets of the image that are in foreground) doesn't come out from screen.
I'm trying to set the left and right eye position. Do you suggest anything?
This my code (page flipping work very well)

[code]
import java.awt.Color;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.Toolkit;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.image.BufferedImage;

import javax.media.j3d.Appearance;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.GraphicsConfigTemplate3D;
import javax.media.j3d.GraphicsContext3D;
import javax.media.j3d.J3DGraphics2D;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.vecmath.Point3d;

import com.sun.j3d.utils.universe.SimpleUniverse;


public class StereoView2 extends JFrame implements Runnable {
        private SimpleUniverse univ = null;
        private Canvas3D canvas;
        private GraphicsContext3D gc = null;
        private J3DGraphics2D g2d = null;
        private BufferedImage imageLeft = null;
        private BufferedImage imageRight = null;
    private int xSize = 0;  
    private int ySize = 0;
    // Set this to true when the graphics card use shared z buffer
    // in stereo mode.
    public static String defaultSharedStereoZbuffer = Boolean.TRUE.toString();
    private boolean sharedStereoZbuffer;
    private boolean stereoSupport;  
 
        //
        // Renders a single frame by clearing the canvas, drawing the
        // geometry, and swapping the draw and display buffer.
        //
        public void render() {
                if (gc == null) {
                        // Set up Graphics context
                        gc = canvas.getGraphicsContext3D();
                        gc.setAppearance(new Appearance());
                        gc.setBufferOverride(true);
                }
                if (stereoSupport) {    
                        if (!sharedStereoZbuffer) {
                            gc.setStereoMode(GraphicsContext3D.STEREO_BOTH);    
                            // This clear both left and right buffers, we
                            // must set STEREO_BOTH before it. Otherwise
                            // it only clear LEFT or RIGHT buffer unless
                            // this is invoke twice for each buffer.
                            gc.clear();
                        }
                }
                gc.clear();
                if (g2d == null)
                        g2d = canvas.getGraphics2D();
                gc.setStereoMode(GraphicsContext3D.STEREO_LEFT);
                Point3d point = new Point3d();
                //canvas.getLeftEyeInImagePlate(point);
                //System.out.println("X: "+ point.getX() +" Y: " + point.getY() + " Z: "+ point.getZ());
                //canvas.setLeftManualEyeInImagePlate(new Point3d());
                g2d.drawImage(imageLeft, (xSize-imageLeft.getWidth())/2, (ySize-imageLeft.getHeight())/2,
                                (xSize-imageLeft.getWidth())/2+imageLeft.getWidth(), (ySize-imageLeft.getHeight())/2+imageLeft.getHeight(),
                                0, 0, imageLeft.getWidth(), imageLeft.getHeight(), this);
                System.out.println("sto visualizzando l'immagine sinistra");
                g2d.flush(true);
                gc.clear();
                gc.setStereoMode(GraphicsContext3D.STEREO_RIGHT);
                //canvas.getRightEyeInImagePlate(point);
                //System.out.println("X: "+ point.getX() +" Y: " + point.getY() + " Z: "+ point.getZ());
                //canvas.setRightManualEyeInImagePlate(new Point3d());
                g2d.drawImage(imageRight, (xSize-imageRight.getWidth())/2, (ySize-imageRight.getHeight())/2,
                                (xSize-imageRight.getWidth())/2+imageRight.getWidth(), (ySize-imageRight.getHeight())/2+imageRight.getHeight(),
                                0, 0, imageRight.getWidth(), imageRight.getHeight(), this);
                System.out.println("sto visualizzando l'immagine destra");
                g2d.flush(true);
                canvas.swap();
        }

        //
        // Run method for our immediate mode rendering thread.
        //
        public void run() {
                System.out.println("SterioView.run: starting main loop");
                while (true) {
                        render();
                        //Thread.yield();
                }
        }


        private void createUniverse() {
                // Get the preferred graphics configuration for the default screen
                GraphicsConfigTemplate3D gct = new GraphicsConfigTemplate3D();
        gct.setStereo(GraphicsConfigTemplate3D.PREFERRED);
        GraphicsConfiguration config =
            GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getBestConfiguration(gct);
                // Create a Canvas3D using the preferred configuration
                canvas = new Canvas3D(config);
                stereoSupport = canvas.getStereoAvailable();
                if (stereoSupport)
                {
                        System.out.println("This machine support stereo");
                        String str = System.getProperty("j3d.sharedstereozbuffer",
                                        defaultSharedStereoZbuffer);
                        sharedStereoZbuffer = (new Boolean(str)).booleanValue();
                        canvas.setStereoEnable(true);
                }
                else
                {
                        JOptionPane.showMessageDialog(null, "Stereo is not support","Attenzione",JOptionPane.WARNING_MESSAGE);
                }

                if (!canvas.getDoubleBufferAvailable())
                {
                    System.out.println("Double buffer is not support !");
                }
                canvas.setBackground(Color.black);
        canvas.addKeyListener(new KeyAdapter(){
        public void keyPressed(KeyEvent e)
        {
        if (e.getKeyCode()==KeyEvent.VK_ESCAPE)
        {
        dispose();
        }
        }
        });
                canvas.stopRenderer();
                // Create simple universe with view branch
                univ = new SimpleUniverse(canvas);

                // This will move the ViewPlatform back a bit so the
                // objects in the scene can be viewed.
                univ.getViewingPlatform().setNominalViewingTransform();

                // Ensure at least 5 msec per frame (i.e., < 200Hz)
                univ.getViewer().getView().setMinimumFrameCycleTime(5);
        }

       
        public StereoView2(BufferedImage imageLeft, BufferedImage imageRight) {
                this.imageLeft = imageLeft;
                this.imageRight = imageRight;
                // Initialize the GUI components
                initComponents();

                // Create Canvas3D and SimpleUniverse; add canvas to JFrame
                createUniverse();
                this.add(canvas);
       
                // Start a new thread that will continuously render
                new Thread(this).start();
        }


        private void initComponents() {
        this.setUndecorated(true);
        Toolkit tk = Toolkit.getDefaultToolkit();  
        xSize = ((int) tk.getScreenSize().getWidth());  
        ySize = ((int) tk.getScreenSize().getHeight());  
        this.setSize(xSize,ySize);
        this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        }
}


[/code]
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[java3d-interest]

Hi all,
page flipping run very well.
I swap the left and right image and the stereo visualization is splendid!
I enough modify my code by add this code:

[code]
canvas = new Canvas3D(config);
                canvas.setLeftManualEyeInImagePlate(new Point3d(-0.033,0,0));
                canvas.setRightManualEyeInImagePlate(new Point3d(0.033,0,0));
.....
[/code]

:-)
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