http://www.sciencedaily.com/releases/2008/03/080316161128.htm
Depth perception not just only because we had 2 eyes, so we do the calculation just by comparing both image data from 2 eyes. But a more complex calculation and understanding than that. We still able to "Feel" depth perception from only one eyes, so basicaly, brain is working on another way to make a 3D world on its own.
Focus.
It would be interesting to analyze people who only ever had one eye, and so don't have the advantage of having had two eyes to "train" the brain.
Note that depth perception vanishes at night. Take a very dimly lit room, and look at objects backlit by this dim light so they appear black. Now close one eye and watch as distance objects can very soon appear to be right in front of you, if you tell yourself to ignore scale. They can also appear to all be at the same distance (flat perspective).
Oliver Sacks: A Neurologist Examines 'The Mind's Eye' (http://www.npr.org/templates/story/story.php?storyId=130732146)
"Sacks tells Terry Gross that since the loss of half of his vision — and
by extension, his stereoscopic vision — he has had to learn to adapt
to a world that appears to be entirely flat."
Hi,
People react differently. This interview seems to describe
a strong reaction. I had my depth perception tested a while
back, and it was about 25% of "normal". Things don't look
flat to me, but I bump into things more than your standard
clumsy person. And judging traffic is harder.
Cheers,
Steve
Although I had essentially perfect vision when I was young, I started having problems with astigmatism in my late 40's. Both eyes are affected, but my right eye is by far the worst. It surprised me when I discovered that the image my brain constructs for both eyes together is considerably better than the image it constructs for either eye individually. As far as I can tell my depth perception works as well as it ever did, and it even works for my peripheral vision were only one eye is involved.
From the science daily article:
Quote
But if the eye is moving while tracking the overall movement of the group of objects, it gives the middle temporal neurons enough information to grasp that the object moving fastest in the same direction must be the closest object, and the one moving slowest must be the farthest, says DeAngelis.
And for the code I posted
here (http://www.masm32.com/board/index.php?topic=17168.msg144509#msg144509), at least to my eyes the fastest moving flakes appear to be in the foreground and the slower ones in the background.
I dont know but I still able to walk with only one eye and other closed. My left eye is blurred and it got minus 2 but Im just fine to reach the door or took the glass.
Remember what I shared this story, I remember when I was a kid and played a sega game titled "Toy Story". It was had a flat lighting, and even jaggy, but I can feel the depth perception. So basically our brain interpret the data from the lines connection, not just the different beetween 2 images. That is why we can felt a paralax sensation. But I dont know about this for sure, maybe I was fooled by nature again as ussual.
I am nearly blind on one eye. Which do not let me drive (since the other eye is not a 100% good either). Nor am I any good at boxing or baseball.
But basically what I do to calculate distance (intuitively) is to use the perceived size of the object, plus perspective distortion.
New clue to cognition http://www.sciencedaily.com/releases/2011/09/110915113629.htm
So our brain paralely compare the input with known data. Our brain had a different architecture than the CPU.