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the 3 images.
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 horizontal positions of the eyes. This is much greater
at closer image distances and dependant on using both eyes. It is my
perception ( no pun intended ), that at all close or reasonably
limited distances, that this is the greater part of depth perception.
Images, Stereo 1, -2 and -3 test this second mechanism. 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.
This is achieved by staring as to more distance objects, 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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