METHOD AND APPARATUS FOR ENHANCING PERFORMANCE OF ENTROPY CODING, AND VIDEO CODING METHOD AND APPARATUS USING THE ENTROPY CODING PERFORMANCE ENHANCING METHOD

摘要

A method and apparatus for enhancing the performance of entropy coding in a multilayer-based codec system are provided. In a variable length coding method for lossless-coding first coefficients among coefficients of a discrete layer and one or more fine granular scalability (FGS) layers, the variable length coding method includes determining a proportion of zeros included in a predetermined unit region to which the first coefficients belong, selecting one of a plurality of grouping units depending on whether or not the proportion exceeds a predetermined threshold, grouping absolute values of the first coefficients using the selected grouping unit, and transforming the grouped absolute values into a code word mapped thereto by referring to a VLC table corresponding to the selected group unit.