BrotherZesty t1_j88vivs wrote on February 12, 2023 at 3:04 PM

This is really cool and very very well done! Good job :) It is usually very hard to get everything right with a stereogram like this, typically there are some doubled edges as a result of imperfections in the lateral separation of the capture locations, but I can't see any in these.

You mentioned that the moon looks closer to the earth than it actually is, and that's an interesting point to make. Typically our visual system is able to calibrate horizontal disparity information based on familiar objects/depth intervals. This is known as stereoscopic depth constancy. When dealing with huge objects and huge distances (such as those featured here) it is inevitable that some distortions will occur. These sorts of stereograms are also subject to what is known as the "cardboard cutout phenomenon" which is why the moon itself appears somewhat flat while there is a very clear depth interval between the moon and the earth.

Sorry for the essay, I just finished my phd on stereoscopic depth constancy processes and wanted to nerd out for a little in the oddly specific field i chose haha. Keep up the good work!

EmergeHolographic OP t1_j89jbdt wrote on February 12, 2023 at 5:48 PM

Thank you so much for saying that! And oh man, that's so neat. I never had the resources to go to college but if I had I would have worked on something stereoscopic too. I love to nerd out about stereoscopy.

You might like this, I used to do this regularly when I figured out the motion parallax process: You can watch the livestream of the ISS and as long as the camera is facing the planet so that the earth is moving left to right, you can place two of these streams next to each other, like a stereograph, and pause one for 5-10 seconds to see depth of the atmosphere. This functions like pausing the orbit of one eye while the other keeps moving, so you can in essence get live parallax of the atmosphere from orbit! If the ISS is over mountains, you can actually see depth to them. It's wild.

I make these as a hobby so if you'd like to see more I often post across the internet with this username. Have you made any stereo imagery yourself?

BrotherZesty t1_j8bwjyz wrote on February 13, 2023 at 3:52 AM

I'm glad to hear you enjoy this kind of thing! I had a quick look at your post history and you have made some really great stuff, keep it up!

When I first saw this I was wondering how you had generated the left and right images and thought you may have been using images captured at different times to simulate the lateral separation. That is a super neat way of approaching this stereogram, and it would explain why it works so well since you only have motion along a single axis (minimising vertical disparities, which can cause issues).

Unfortunately the stereo images I have made are rather boring, usually a texture patch that is magnified in one eye to give the impression of slant. However, it is something I would like to dabble in when I have some time off. I'll be sure to keep an eye out for anything you make in the future!

EmergeHolographic OP t1_j8ehn2d wrote on February 13, 2023 at 6:45 PM

Aww thank you! 😍 I really appreciate the positive feedback! I get a lot of pushback for calling some of my work stereoscopic, even though to me that's just a description of the medium

>When I first saw this I was wondering how you had generated the left and right images and thought you may have been using images captured at different times to simulate the lateral separation.

Yes! So glad people get it. There's something really magical about watching the world this way. I mentioned doing this with the ISS, however there's more macro footage of the whole globe rotating that this can be accomplished with, and it's amazing because this creates an illusion of depth to the sun's reflection off the Earth, which I did not expect. Vision is so cool.

I'm curious, as I discovered how to do this using self-teachings, are you familiar with a name for this technique? I've been referring to it as motion parallax but I'm not sure if that's entirely correct when making a stereograph out of two different frames in time.

Thanks again for your feedback!