Re:Stereo Depth Formulas, was (3D Panoramic Cirkut)

[threed@xxxxxxx (Bob Mannle)]

>>From: Arvid Olson <ao20239@xxxxxxxx>
 Has 
>>any body worked out the distance the cameras would have to be separated 
>> in order to get a 3D panoramic effect.  Does the focal length of the 
>>lenses affect the distance or separation that the two panoramic cirkut 
>>cameras should be placed from one another.  Is there a good technical 
>>book on the mathematics and physics of 3D photography out there that 
>>one might browse to resolve these issues.                              
>>                                                        
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Not knowing what this camera is certainly puts me at a loss but I can
tell you how some of the elements you mention effect stereo depth.

In calculating the stereo base (separation between the cameras) there
are 4 constants to be aware of:
            
        Distance from camera to near subject
        Distance from camera to infinity
        Focal Length of lens(es)
        On-Film deviation (parallax allowed between the two images)

The first three are pretty easy... the fourth one is the one I'm vague
about concerning your camera equipment.

One book to refer to regarding all of this is "Stereo Photography" by
Fritz G Waack. I know that Reel 3-D carries it for $7.95. In the very
back of the book are some detailed graphs dealing with much of this.
Perhaps you'll be able to dechiper the proper information regarding the
on-film deviation for your camera equipment. It varies according to the
film chip size.

The formula... once all constants have been discovered... is:

Near Distance X Far Distance X On-Film Deviation
------------------------------------------------- -1 = Stereo Base
Focal Length X (Far Distance - Near Distance)


Some of the On-Film Deviation factors commonly used are:

              Realist format = 1.2mm
              35mm Full Frame = 1.5mm
              Medium Format   = 3.06mm


In the past I had written a computer program using this calculation,
and use the program, or the printed spread sheets to assist me when
out on assignment. I have found that this will often be the minimum
stereo base I want to use, and will increase the stereo base from
here, depending upon what form of 3-D I will be using the images for.
Using them as is is often good for projection, but a larger stereo base
could be used for anaglyph.

This should get you going on formulating the calculations required
for your special system.

Best Regards,




Bob Mannle

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