Syntax-based arithmetic coding for low bit rate videophone

Details Syntax-based arithmetic coding for low bit rate videophone Syntax-based arithmetic coding for low bit rate videophone

1994-12-16

1997-08-05

Gaffin, Jeffrey A.

Coded data generation or conversion

Digital code to digital code converters

Adaptive coding

341107, 382247, H03M 730

Patent

active

056547021

ABSTRACT:
A variable length coding process encodes a string of symbol values using arithmetic coding models selected according to the syntax of the string. The arithmetic coding models are optimized for each separate symbol in the string to provide efficient coding that provides a shorter average code length than is provided with arithmetic coding using a single model. In an embodiment for moving image coding, two sets of arithmetic coding models, one for intra frames and one for inter frames, are used for a series symbols representing DCT blocks. The model used for a symbol depends of the symbol's value and order in the series.

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patent: 5272478 (1993-12-01), Allen
patent: 5418532 (1995-05-01), Lei
Pennebaker et al., "An Overview of the Basic Principles of the Q-Coder Adaptive Binary Arithmetic Coder," IBM J. Res. Develop., vol. 32, No. 6, Nov., 1988, pp. 717-726.

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