基于上下文的自适应二进制算术编码研究.pdf

39 6 浙 江 大 学 学 报( ) V ol . 39 N o . 6 2005 6 Jo urnal of Z hej ang U n v ers ty ( Eng neer ng Sc ence) Jun. 2005 谢 林, 虞 露, 仇佩亮 ( , 310027) : H . 264 ( CA BA C) , . CABAC , CA BA C , ; CABA C , CA BA C , , . , , , . : ; ; : T N9 19 . 8 : A : 1008 973X ( 2005) 06 09 10 05 Research on context-based adaptive binary arithmetic coding X IE L n, Y U L u, Q IU P e- l ang (D ep ar tment of I nf or mation Science and E lectr onic Eng ineer ing , Zhej iang University , H ang z hou 3 10027, China Abstract: T o solve t he pro blem o f h gh computat onal com plex t y and large memo ry space n cont ex t- based adapt ve b nary ar t hmet c cod ng ( CA BA C) of t he v deo cod ng st andard H . 264, a new s mple encoder scheme w as proposed . T heo ret cal analys s o f CA BA C ent ro py co d ng arch t ect ur e y elded a for mula fo r calculat ng t he cod ng ef f c ency , and opt m al quant z at on po nt set s f or d ff erent pr obab l t es w ere obta ned f rom t h s f orm ula. Af t er adjust ng t he prec s o n o f t he rang e and scal ng f act or n the mult pl cat on-fr ee adapt ve b nary ar t hmet c coder n CA BA C, t he ef fect s o f t hese param et ers and the quant zat on po nt set s on t he cod ng ef f c ency and m em ory space f or t he CA BA C ent ropy cod ng w ere nvest g at ed, and t he new encoder scheme w as t hen set up . T he exper m ent al results on d ff erent p cture sequences under t h s scheme sho w t hat the m em ory space and computat onal co mplex ty can be reduced great ly w t hout much decr ease of t he cod ng eff c ency. T h s schem e s ef f c ent n t he v deo com mun cat on w here l