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tech / rec.photo.digital / Stereo Depth Perception !

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o Stereo Depth Perception !casagiannoni

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Stereo Depth Perception !

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From: casagian...@optimum.net
Newsgroups: rec.photo.digital
Subject: Stereo Depth Perception !
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 by: casagian...@optimum.net - Wed, 19 Jan 2022 21:39 UTC

I have always been fascinated by the phenomenon of depth perception in
vision. It would seem that this is a combination of two mechanisms :

First there is the automatic simple focus position of the eye to
achieve a clear image. This doesn't depend on using both eyes and will
work just as well with one eye.

Then, there is the slight though very significant difference between
the perceived images in the left and right eyes, owing to the
difference in the horizontal positions of the eyes. This is much
greater at closer image distances and dependant on both eyes. It is my
perception ( no pun intended ), that at all close or reasonably
limited distances, this is the greater part of depth perception.

Images, Stereo 1, -2 and -3 have been developed to test this second
mechanism. See : https://postimg.cc/gallery/3fnjbwcn4/

These depend on deliberately misaligning eyes in such a way that the
two orange dots at the top of the image are spilt and resolved into
three images.

With an image displayed full screen, stare above the screen as to
something more distant, which will shift the left image to the right
and the right image to the left. When the images resolve to three, by
overlapping of the right dot of the left eye with the left dot of the
right eye, the eyes are set to perceive depth in the image.

Each image consists of a narrow random display of dots extending top
to bottom, where this displayed area is repeated horizontally across
the image width, with the same approximate spacing as between the
three orange dots. The eyes will lock on the display where each eye is
actually locked on subsequent repeats of the display. Now, the display
has deliberately been altered in the horizontal direction at various
areas of the whole image, such that the eyes will perceive an apparent
shift in angular position of these areas, which will be perceived as a
different depth via the second mechanism.

A very neat trick that works surprisingly well !

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