
Figure 40.6 Zigzag scan[0]
denotes the scan order used
in JPEG and MPEG-1, and
available in MPEG-2.
Figure 40.7
Zigzag scan[l]
may be chosen by an MPEG-2
encoder on a picture-by-
picture basis.
Distributed refresh does not guar-
antee a deterministic time to
complete refresh. See Lookabaugh,
cited at the end of this chapter.
AAPEG-2 allows an encoder to choose between two VLE
schemes: the scheme first standardized in MPEG-1, and
an alternate scheme more suitable for frame-structured
pictures with interfield motion.
Block diagrams of an MPEG-2 encoder and decoder
system are sketched in Figure 40.8 opposite.
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