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Cross-eyed Viewing Method « on: April 22, 2006, 08:51:22 PM » Cross-eyed Viewing Method (Free-Vision Fusion)



The photos on this site (



This technique has the advantage of not requiring special viewing equipment. Fusion is the term used for the process for visually merging the left-eye image and the right-eye image into a single 3-dimensional image. When using a viewer, most of the work of achieving the needed abnormal convergence for stereo viewing is done by the optics and design of the stereo viewer.



Free-vision fusion requires patience and practice because your willpower and eyes must do the work of the stereo viewer. You must be able to focus where your eyes aren't looking.



Place the image in Figure 1 in the center of your screen.

Sit at your normal distance.

Slowly cross your eyes. You will see a double image, or four dots.

Continue to cross until the middle two images overlap.

Adjust focus on middle image, keeping the two images overlapped.

You should see the blue circle floating above the black circle.

Figure 1

If the blue circle is underneath the black circle, you have used the parallel free-vision fusion technique, which is more difficult, and tends to give me a lasting headache.



If you are having problems with this method, try the following alternate method:



Place index finger between images at bottom.

Focus on your index finger.

Slowly bring your finger towards your nose, staying focused on your finger, but paying attention to the background images in your peripheral vision. You will notice that instead of two images, there are four images floating about.

Continue bringing your finger closer to your nose- you will see the two middle images moving towards each other.

When the two middle images are aligned, or are on top of each other, stop moving your finger. You will now see three images in the background. The middle one contains the left/right images overlapped.

Slowly remove your finger from your field of vision, while keeping the middle two images aligned.

Gradually force your focus out to the combined left/right image in the middle.

If you have problems keeping a lock on the middle image, try leaving your finger in the image for a while, but still focusing on the center image. Use your finger to regain left/right fusion.

If at first you fail, don't worry. It took me a while. Relax, go away and rest your eyes, and try it again later.

Once you have mastered the technique on the dots above, try the more complicated image in Figure 2. While still having only two depth planes, it should be visually more interesting. Practice should be done on these simpler images before moving on to more complicated scenes (i.e. real life).



Figure 2

The lady should be floating above the brick surface. If the image is confusing, you have again mastered the parallel free-vision fusion (wall-eyed) technique. Take a break and try the alternate instructions listed above.



Once you can fuse and resolve the stereo image above, try practicing with the same image but move your eyes around the picture. Move from point to point, while maintaining left/right fusion. This will allow you to more fully appreciate the 3D scenes in the galleries.



For more practice, here are the first 3D images of Mars taken in 1976: The photos on this site ( www.3dphoto.net ) are primarily in a format that requires cross-eyed viewing. It sounds worse than it is, and most people can view 3D pictures in this way (unless you have been cross-eyed before or have some other handicap involving one of your eyes). Some people need more time than others to perfect the mechanism, but once you have done so, it is really easy to do.This technique has the advantage of not requiring special viewing equipment. Fusion is the term used for the process for visually merging the left-eye image and the right-eye image into a single 3-dimensional image. When using a viewer, most of the work of achieving the needed abnormal convergence for stereo viewing is done by the optics and design of the stereo viewer.Free-vision fusion requires patience and practice because your willpower and eyes must do the work of the stereo viewer. You must be able to focus where your eyes aren't looking.If the blue circle is underneath the black circle, you have used the parallel free-vision fusion technique, which is more difficult, and tends to give me a lasting headache.If you are having problems with this method, try the following alternate method:Once you have mastered the technique on the dots above, try the more complicated image in Figure 2. While still having only two depth planes, it should be visually more interesting. Practice should be done on these simpler images before moving on to more complicated scenes (i.e. real life).The lady should be floating above the brick surface. If the image is confusing, you have again mastered the parallel free-vision fusion (wall-eyed) technique. Take a break and try the alternate instructions listed above.Once you can fuse and resolve the stereo image above, try practicing with the same image but move your eyes around the picture. Move from point to point, while maintaining left/right fusion. This will allow you to more fully appreciate the 3D scenes in the galleries.For more practice, here are the first 3D images of Mars taken in 1976: http://www.3dphoto.net/text/viewing/mars.html





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http://www.facebook.com/the3dphotographybook Santa Cruz, CaliforniaEquipment- dual Canon EOS 50D DLSR, Samsung Note 8, iPhone 7SComputer: NVIDIA 3D, LG Passive 3D displayStyle- Cha-cha (cell phone), Dual Camera RigEditing- Lightroom, Photoshop CC, StereoPhoto Maker lparian New Member



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Re: Cross-eyed Viewing Method « Reply #1 on: December 30, 2006, 06:42:57 AM » I have heard this method called "freeviewing" meaning that no apparatus is used.



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Re: Cross-eyed Viewing Method « Reply #2 on: December 30, 2006, 09:49:15 AM » Correct- free viewing can be either cross-eyed or parallel, but nothing other than your eyes are used. However, some people have difficulty with it, or at least need to practice it a lot. It took me about a day to learn it the first time I tried it (on some NASA Mars photos from Viking).

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http://www.facebook.com/the3dphotographybook Santa Cruz, CaliforniaEquipment- dual Canon EOS 50D DLSR, Samsung Note 8, iPhone 7SComputer: NVIDIA 3D, LG Passive 3D displayStyle- Cha-cha (cell phone), Dual Camera RigEditing- Lightroom, Photoshop CC, StereoPhoto Maker Print 3D Photography Forum Community | Techniques | Techniques- Viewing 3D Photos | Cross-eyed Viewing Method



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