Autostereogram

http://www.scholarpedia.org/article/Autostereogram

by lainon • 9 years ago

22 11 9 years ago

itcrowd• 9 years ago

I couldn't get it working for me on the first image. Could anyone give more pointers on how to make it work? If I "clear the blurriness", all I see is the original image, razor sharp.. No furrows and no triplet..?

Figure 1: 'Furrows' (1979). One of the first random-dot autostereograms (from Tyler, 1994). Converge or diverge the eyes so as to see a triplet of three red dots, then clear the blurriness while maintaining the triplet to view a field of horizontal furrows in vivid 3D.

yuchi• 9 years ago

I do it instinctively since I was 5 so it's hard to explain it.

If you can use a big monitor it would be easier.

Place very near the screen, enough to trick your left eye to see the left small eye icon, and the right eye the right icon. You should see it as a single eye. Now slowly move your head back and try to keep relaxed. If you get to do it you should see the illusion of 3D appear on the whole image.

Avshalom• 9 years ago

Can you get other autostereograms to work? That particular one took me a while to get focused even though every thing else on the page came quite easily.

Arnavion• 9 years ago

I don't get what the caption means by "clear the blurriness". The way I did it is that once I had crossed my eyes to see approximately 3 dots, I started moving my eyes up and down across the image (about 2 seconds to go from one end to the other) while still maintaining the same amount of cross-eyed-ness. After ten or so movements the 3D effect emerged. Once the effect emerged my eyes instinctively crossed themselves as necessary to make it sharper, so I didn't have to try very hard to maintain it.

It may help to move your head up and down instead of your eyes so that the parallax effect of floating above the field of horizontal furrows is strengthened.

khedoros1• 9 years ago

I usually start by focusing past the plane of the image, wait until the 3D effect emerges, then hold onto the effect while focusing on the image itself. That last part "clears the blurriness" for me, and I can see the texture of the image clearly while also seeing the 3D structure.

I've never been able to use the "cross your eyes" method, so I guess I diverge my focus instead of converging it.

Xoros• 9 years ago

It's pretty hard to explain. One day you're sure everyone's fooling you and there's no 3D, and then bam, you find the trick.

From the explanations I heard, you have to focus to the double distance between you and the picture, and let your eyes wander.

First time I saw one, when it became a big hit, it was pictures framed in the street. The guy said to focus on my reflection on the glass of the frame, and then try to blur a little.

It worked pretty quick.

So may be you can try something like that, in the réflexion of your screen ?

aidenn02• 9 years ago

The first one is the hardest on that page.

Also, try zooming in a lot (Ctrl-scrollwheel in most browsers), as I found them to be too small on my monitor to do comfortably at the default zoom.

billdybas• 9 years ago

You may know these as "Magic Eye" puzzles. Here's a video on how they work: https://www.youtube.com/watch?v=v8O8Em_RPNg

devrandomguy• 9 years ago

Wow, this is awesome for viewing X-Ray or MRI images. It is especially useful for separating the subject from the background stars in astronomy, if you can take two pictures six months apart to get a stereoscopic separation of 2 AU.

MRI: http://fuckyeahnervoussystem.tumblr.com/post/3723835723/brai...

Eagle Nebula (?): https://i.pinimg.com/736x/b4/4d/10/b44d10e3d9cef1d90340f443d...

I would love to see an IC with the layers separated this way, or a 16-layer PCB.

AstralStorm• 9 years ago

Autostereograms reduce spatial acuity by a lot. Not good for viewing thin or precise objects.

aidenn02• 9 years ago

The game "Magic Carpet" had a random-dot autostereogram mode; it gave me a headache after playing it for a while, but it was really cool.

Found a screenshot with google: http://imgur.com/HaZOsoJ

Autostereogram

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