Variable length coding method and variable length decoding...

Details Variable length coding method and variable length decoding... Variable length coding method and variable length decoding...

2011-06-28

2011-06-28

Harold, Marsha D Banks (Department: 2482)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C382S247000

Reexamination Certificate

active

07970059

ABSTRACT:
A variable length coding method is comprised of: a coefficient value scanning step in which an RL sequence generation unit203, a reordering unit202, and a binarization unit203scan coefficient values within a block in a predetermined scanning order starting at a higher-frequency component toward a lower-frequency component; and an arithmetic coding step in which an arithmetic coding unit205and a table storage unit204perform arithmetic coding on the absolute values of the coefficient values according to the scanning order used in the coefficient value scanning step, by switching between probability tables1˜4for use, wherein, in the arithmetic coding step, a probability table to be used is switched to another probability table in one direction, when the arithmetic-coded absolute values of the coefficient values include an absolute value exceeding a predetermined threshold value.

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