P3D Re: other depth cues

[Jim Crowell <crowell@xxxxxxxxxxxxxxx>]

At 8:32 PM -0800 3/24/98, Boris Starosta wrote:
>
>I added some new pictures to my 3D Showcase, demonstrating an unusual case,
>where DOF information, and other depth cues (like motion parallax), may be
>indispensable to the brain for an analysis of the spatial structure of this
>scene.
>

Hi Boris,

That's an interesting point.  I have a similar photo of some birds in a
cage at the zoo; depending on where you look, the bars can look like
they're actually behind the birds (they generally appear to be close to the
plane of convergence, i.e. at a similar depth to whatever else you're
looking at in the scene).  Do you have a large-aperture shot of the same
scene?  I'm curious about how much you get from blur in the absence of
motion parallax.

I notice that I am occasionally subject to this illusion in real life; at
the last place where I worked one fellow liked to walk around while talking
on the phone, and every now & then I would trip over the spiral (&
therefore periodic) telephone handset cord because I had misperceived its
distance.

-Jim C.

----------------------
Jim Crowell
Caltech Division of Biology
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