Patent ID: 6894628
Filing Date: 2005-05-17
Classification: H03M,H04N

Abstract:
1. Apparatus for entropy-encoding a symbol sequence of information symbols to obtain entropy-encoded information symbols, the symbol sequence having a start symbol, comprising: an arithmetic encoder for arithmetically encoding a symbol of the symbol sequence based on probability information for the symbol, the symbol being part of a symbol set, to produce the entropy-encoded information symbols; a context modeler for deriving the probability information for the symbol based on a context of the symbol, the context including one or more context symbols processed by the arithmetic encoder prior to processing the symbol, the context modeler including an initializer for initializing the context modeler by determining and providing initialization probability information to the arithmetic encoder, the initialization probability information to be used by the arithmetic encoder for processing the start symbol, wherein the initializer is operative to determine the initialization probability information based on an estimation of symbol statistics relating to the start symbol such that an initialization probability distribution is different from an equi-probable distribution for all symbols of the symbol set.