[Lab] Depth Perception
darcy at siteware.com
Mon Aug 22 16:29:18 EDT 2011
Also, some of the joy of depth perception comes from when you move your head
and the image changes. With a camera system the cameras can only change
direction but not location.
I suppose some sort of RC aircraft could carry each camera. That's be cool.
Now we're getting expensive. You'd need two quad copters, some nice
stabilized cameras and lots of time. :)
On Mon, Aug 22, 2011 at 4:24 PM, Paul & Andrea Mumby <themumbys at gmail.com>wrote:
> Too bad stars are so far away that even with several kilometers of
> stereo separation you likely won't get depth out of the starfield. Because
> that would be damn cool...
> - Paul
> On Mon, Aug 22, 2011 at 4:21 PM, Darcy Whyte <darcy at siteware.com> wrote:
>> Ah, I see, the eyes can can change their alignment to snap on to the 3d
>> experience automatically.
>> So the easiest solution is to just have the cameras stationary, perhaps
>> converged a couple km out.
>> Once adjusted you can see the clouds go by in 3d.
>> I guess time lapse would be a great way to capture the material. Then you
>> could play it back whenever you want and the motion would make it cooler.
>> But if you wanted to go real time an pan, you'd need to make sure the pan
>> rates are well match or it would "un-snap" you from the 3d experience.
>> I bet you could get a nice 3d effect even if the cameras were only like a
>> few meters apart.
>> On Mon, Aug 22, 2011 at 4:01 PM, Jason Cobill <jason.cobill at gmail.com>wrote:
>>> Alignment's not too tricky - generally, 3D movies aim the cameras
>>> parallel to eachother and let your brain do the tricky work of converging
>>> the images. They don't need to be exactly parallel for this to work, and
>>> this is the reason some people get wicked migraines watching Avatar.
>>> You can get the same effect as the XKCD experiment (and Avatar) with a
>>> highly simplified process:
>>> - Find a point on the horizon and take a picture of it.
>>> - Walk a few feet.
>>> - Take a picture aimed at the same point on the horizon
>>> - Bring the two images together side-by-side on the computer
>>> (preferably without border lines between them)
>>> - Cross your eyes really hard like you're looking at a "magic eye"
>>> image, and they'll converge and you can see your clouds in 3d.
>>> Or save yourself the effort of going outside and look at these:
>>> http://phereo.com/ (Be sure to click "Mode" and select "Crossed" if
>>> you don't want to use special glasses)
>>> The technique is really old - I have a number of friends with
>>> collections of stereoscopic images from the mid 1800's! It was a fun party
>>> toy for Victorians.
>>> You can find out a bit more here:
>>> Also worth noting that stereo pairs are extensively used in aerial
>>> surveys - a plane takes two photos in succession and the pair can be
>>> converged to get a 3d view. I've often spotted clouds, boats, and even other
>>> planes in high-altitude aerial surveys. I should mention that the effect is
>>> a little less exciting than the XKCD comic paints it to be. Having a pair of
>>> stereo glasses definitely relieves the stress of staring crosswise and lets
>>> you feel a bit more immersed in the image.
>>> -Jason Cobill
>>> Lab mailing list
>>> Lab at artengine.ca
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