An open and shut case [computer graphics]
Glassner, A.
Microsoft Corp., Redmond, WA;
This paper appears in: Computer Graphics and Applications, IEEE
Publication Date: May/Jun 1999
Volume: 19,
Issue: 3
On page(s): 82-92
ISSN: 0272-1716
References Cited: 0
CODEN: ICGADZ
INSPEC Accession Number: 6246238
Digital Object Identifier: 10.1109/38.761554
Current Version Published: 2002-08-06
Abstract
You press the button on your camera, the shutter opens, the film
is exposed, the shutter closes, and you have a picture. If anything
moved, including you, the image will show motion blur. When we create
synthetic images with computer graphics, we have to account for motion
blur for three reasons. First, we're used to it from physical motion
pictures. Second, without motion blur a film can suffer from strobing, a
psychophysical phenomenon. Third, without motion blur an object can
alias in time. In a real camera, a mechanical device called the shutter
controls the exposure of the film. The computer graphics literature
includes many camera models, lenses, and even discussions of film and
its simulation. Surprisingly, there is little discussion of simulating
how a moving shutter actually exposes the film. The author finds it
surprising because modeling the shutter mechanism is easy, and as shown
in the article, very important to the rendered image. The following
shutter types are modelled via computer graphics: instantaneous shutter;
uniform shutter; focal plane shutter; interlaced shutter; leaf shutter;
inverse leaf shutter; and clock shutter
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