P3D Glossary of Stereo

[fj834@xxxxxxxxxxxxxxxxxxxxx (Dr. George A. Themelis)]

The last issue  of the "Journal of 3-D Imaging" (per previous posting) has
a glossary of Stereoscopic Terminology.  From it we read:

Colardeau progression: The advancement of film in a (5-perforation) stereo
camera by a constant two frames, resulting in stereo pairs separated by two
unrelated pairs and thus achieving maximum film economy.  The progression
sequence was designed by L.J.E. Colardeau for use with the first 35 mm
stereo camera, the Homeos in 1914, and adopted for use with the first
mass-produced stereo camera in the 1950s, the Stereo Realist.  The
advantage of this progression is that the film travels the same distance
each time it is advanced, allowing a much simpler and more reliable film
advance mechanism.  The disadvantage is that the individual frame width is
limited to one-third of the distance between the centres of the left and
right images, which in practice (with 70 mm base) determines the
5-perforation (23 mm) image size.

Also:

Cardboarding:  The condition where objects appear as if cut out of
cardboard and lack individual solidity.

-- George Themelis


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