
Resampling, interpolation,
and decimation
17
In video and audio signal processing, it is often neces-
sary to take a set of sample values and produce another
set that approximates the samples that would have
resulted had the original sampling occurred at different
instants- at a different rate, or at a different phase.
This is called
resampling.
(In PC parlance, resampling
for the purpose of picture resizing is called
scaling.)
Resampling is an essential part of video processes such
as these:
9 Chroma subsampling (e.g., 4:4:4 to 4:2:2)
9 Downconversion (e.g., HDTV to SDTV) and upconver- ...