Adaptive probability estimator for entropy encoding/decoding

Details Adaptive probability estimator for entropy encoding/decoding Adaptive probability estimator for entropy encoding/decoding

H - Electricity

03

M

354/67

H03M 7/00 (2006.01) H03M 7/42 (2006.01)

Patent

CA 2014549

- 12 - ADAPTIVE PROBABILITY ESTIMATOR FOR ENTROPY ENCODING/DECODING Abstract In entropy, e.g., arithmetic, encoding and decoding, probability estimates are needed of symbols to be encoded and subsequently decoded. More accurate probability estimates are obtained by controllably adjusting the adaptation rate of an adaptive probability estimator. The adaptation rate is optimized by matching it to the actual probability values being estimated. In particular, the adaptation rate is optimized to be proportional to the inverse of the smallest value probability being estimated. Consequently, if the probability values being estimated are not small a "fast" adaptation rate is realized and if the probability values being estimated are small a necessarily slower adaptation rate is realized. (FIG. 1).

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