Method, apparatus and system for encoding and decoding video data

Abstract A method (800) for decoding a precinct (410) of compressed video data from an encoded video bit-stream (115), the precinct of compressed video data including one or more 5 wavelet coefficient sub-bands , the method comprising the steps of: determining, for each value (5127) of a significance map (5114) of the precinct, a corresponding coefficient group position and coefficient group orientation (415, 416), the coefficient group orientation being chosen to reduce a variation in a most significant bit plane index set (5128) of the coefficient group (5108); decoding (820) the coefficients of the coefficient 10 group using a most significant bit plane index (5129), the most significant bit plane index depending upon the corresponding coefficient group position and orientation; and applying (815) an inverse wavelet transform to the decoded group of sub-band coefficients to generate video data associated with the precinct. P261450 / 12825164_2 - - - - - - - - - - - - - - > c c'J I--I IC> -~ -0 -- ~ IC/ a) -I ai cm, LO E 0 cor - 2 C.0