125 Why does film perform so well with MPEG ? (MPEG-2)
Description
This article is from the MPEG FAQ, by Frank Gadegast phade@cs.tu-berlin.de with numerous contributions by others.
125 Why does film perform so well with MPEG ? (MPEG-2)
1. The frame rate is 24 Hz (instead of 30 Hz) which is a savings of
some 20%.
2. Film source video is inherently progressive. Hence no fussy
interlaced spectral frequencies.
3. The pre-digital source was severely oversampled (compare 352 x 240
SIF to 35 millimeter film at, say, 3000 x 2000 samples). This can
result in a very high quality signal, whereas most video cameras do not
oversample, especially in the vertical direction.
4. Finally, the spatial and temporal modulation transfer function (MTF)
characteristics (motion blur, etc) of film are more amenable to the
transform and quantization methods of MPEG.
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