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Author Topic: Frame Rate Perception  (Read 896 times)

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Surly1

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Re: Bees are Smart
« on: October 10, 2013, 05:44:04 am »
Film has traditionally played at 24 frames per second (fps); it is video which plays out at 30 fps.

When they started showing films on TV the difference in frame rates was a problem. The obvious solution is to simply speed up the film to match the television frame rates, but this, at least in the case of NTSC (the American TV standard), is rather obvious to the eye and ear. This problem is not difficult to fix, however; the solution being to periodically play a selected frame twice. For NTSC, the difference in frame rates can be corrected by showing every fourth frame of film twice, although this does require the sound to be handled separately to avoid "skipping" effects. A more convincing technique is to use "2:3 pulldown", discussed below, which turns every second frame of the film into three fields of video, which results in a much smoother display.

http://en.wikipedia.org/wiki/Telecine




 

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