Re: P.S. to John!!!

[P3D William Carter <wc@xxxxxxxxxxxxxxxxxxx>]

On  Wed, 16 Oct 1996, William Carter wrote:

>In SL3-D, you see depth in a relative way, never as an absolute. But, 
>neither will an image ever seem compressed, stretched or otherwise 
>"unnatural". 
>
>I'd like to see a stereo pair made from a composit of dual and single lens 
>3-D.

Here's a little something I (thanks to Joe Towers) just ran across:

Depth From Focus and Defocus

Investigators: Yalin Xiong, Steven A. Shafer

We are now working to blend information from defocus and stereo vision in 
a single system, to take maximum advantage of the complementary 
information provided by each. The key observation is that defocus 
computation is based on a difference of Fourier magnitude, while stereo 
disparity is based on Fourier phase, so that the two can be combined in a 
single framework. We are developing a new method for 3D model
acquisition using this technique, so that the camera position (i.e. stereo) 
and lens parameters (i.e. focus) can be jointly optimized to get the most 
information from each new image.

Hmmm. 
So  what's Fourier magnitude/phase mean???

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