December 2002
Intermediate to advanced
454 pages
25h 39m
English
Content preview from Lossless Compression Handbook
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120 PART II/COMPRESSION TECHNIQUES
intervals that are fully used and match perfectly, so we need to take some extra precautions to
be sure that (5.47) is always satisfied. What Eq. (5.52) tells us is that we solve the problem if
we artificially decrease the interval range assigned for
p(M -
1). This is equivalent to setting
aside small regions, indicated as gray areas in Fig. 5.7, that are not used for coding and serve as
a "safety net"
This extra space can be intentionally added, for example, by replacing (5.40) with
lk = (bk-1 + [[C(Sk q-
1)'/k-1]]) --
(bk-1 q- [[C(Sk) " /k-1]])
-- (
(5.53)
where 0 < ( << 1 is
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