Variable length coding method and apparatus

Details Variable length coding method and apparatus Variable length coding method and apparatus

2005-07-12

2005-07-12

Kelley, Chris (Department: 2613)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

Reexamination Certificate

active

06917651

ABSTRACT:
A variable length coding method and apparatus is provided. The variable length coding method includes the steps of (a) selecting predetermined macroblocks from among the previous macroblocks of a macroblock to be coded in a current frame, (b) analyzing the occurrence statistics of symbols with respect to the selected macroblocks, (c) resetting a mapping relationship based on the analyzed occurrence statistics of symbols, and (d) variable length coding a current macroblock based on the reset mapping relationship. The variable length coding method dynamically varies the mapping relationship between symbols and bit patterns based on the occurrence statistics of the symbols, thereby reducing the amount of bits generated when coding images of the same picture quality.

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