T3D Re: Cardboarding...

["William J. Carter, Ph.D." <wc@xxxxxxxxxxxx>]

At 11:13 AM 10/6/98 -0600, the exegetic John B wrote:

>Oh, I thought you meant you wanted to compare/contrast SL3D and DL3D.  
<snip>
>...  Obviously I'm not understanding your
>point just yet.  My apologies.
No John, you are right. It's me who's missing my point :-)

And, as Jim Crowell pointed out:
>>... in the absence of other depth cues, the brain only recognizes
>>edge boundaries,
<snip>
>...  In order to design a good experiment you need to specify your
>alternative hypothesis.

Here's what I think:
Dual lens systems provide the brain with contrasting edge boundaries. This
contrast could be the result of the different L/R views of an object, or the
contrast between the different L/R views of an object and it's background.

This contrasting separation from the background results in card boarding
when other depth cue aren't present.

I would like to test this idea, as I believe it is axiomatic to what
information dual lens systems actually provide.

I also believe that:
Single lens systems provide the brain with depth information in the form of
the various sizes and orientations of the circles of confusion; not by
triangulation based on the centroids. But, I don't know if that belongs in
this discussion.

One thing I have noticed is that there is no card boarding in a single lens
stereo pair. 

Here's the question(s) I'd like to answer:
1. Will I get card boarding with a subject, in sharp focus, which has no
discernable surface features, regardless of it's having a z-axis dimension?
I expect the answer is yes, but it seems this needs to be proved.

2. With the above subject, will the brain be able to fuse "out-of-focus"
information and effect depth from a dual lens, if the stereo pair is more
shallowly focused? I expect so, dunno really. The fact that there is no
"center information" in a dual lens pair suggests to me that ... something's
going to be missing!?

3. Will I get depth shooting the same subject in SL3D? Dunno about that one
either.

Bob Maxey (just) wrote:
>As I understand it, Cardboarding is the lack of depth in some parts of the
>scene. The result is that certain objects look flat in an otherwise
>Depthfull (Wow, a new word) scene. Am I correct in this?
That's the way I'm reading it, Bob.


------------------------------