Method for coding pulse vectors using statistical properties

摘要

Improved methods for coding an ensemble of pulse vectors utilize statistical models (i.e., probability models) for the ensemble of pulse vectors, to more efficiently code each pulse vector of the ensemble. At least one pulse parameter describing the non-zero pulses of a given pulse vector is coded using the statistical models and the number of non-zero pulse positions for the given pulse vector. In some embodiments, the number of non-zero pulse positions are coded using range coding. The total number of unit magnitude pulses may be coded using conditional (state driven) bitwise arithmetic coding. The non-zero pulse position locations may be coded using adaptive arithmetic coding. The non-zero pulse position magnitudes may be coded using probability-based combinatorial coding, and the corresponding sign information may be coded using bitwise arithmetic coding. Such methods are well suited to coding non-independent-identically-distributed signals, such as coding video information.

主权项

1. A method for decoding a coded bitstream to reconstruct an ensemble of pulse vectors, said method comprising:
receiving, by a video block, from the coded bitstream a statistical model codeword set; decoding, by the video block, said statistical model codeword set to determine a set of statistical parameters corresponding to the ensemble of pulse vectors; receiving, by the video block, from the coded bitstream respective vector codeword sets corresponding to respective pulse vectors of the ensemble; for each respective vector codeword set:
decoding a first codeword of the respective vector codeword set to determine a first pulse parameter corresponding to a number of non-zero pulse positions within a corresponding respective pulse vector;decoding at least a one of a remaining plurality of codewords of the respective vector codeword set, using the set of statistical parameters for the ensemble and the number of non-zero positions within the corresponding respective pulse vector, to determine at least one of a remaining plurality of pulse parameters describing the non-zero pulse positions within the corresponding respective pulse vector; anddetermining each of the non-zero pulse positions within the corresponding respective pulse vector of the ensemble using the respective plurality of pulse parameters.