IEEE Trans Image Process - Rate control scheme for consistent video quality in scalable video codec.

Tópicos

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Resumo

Multimedia data delivered to mobile devices over wireless channels or the Internet are complicated by bandwidth fluctuation and the variety of mobile devices. Scalable video coding has been developed as an extension of H.264/AVC to solve this problem. Since scalable video codec provides various scalabilities to adapt the bitstream for the channel conditions and terminal types, scalable codec is one of the useful codecs for wired or wireless multimedia communication systems, such as IPTV and streaming services. In such scalable multimedia communication systems, video quality fluctuation degrades the visual perception significantly. It is important to efficiently use the target bits in order to maintain a consistent video quality or achieve a small distortion variation throughout the whole video sequence. The scheme proposed in this paper provides a useful function to control video quality in applications supporting scalability, whereas conventional schemes have been proposed to control video quality in the H.264 and MPEG-4 systems. The proposed algorithm decides the quantization parameter of the enhancement layer to maintain a consistent video quality throughout the entire sequence. The video quality of the enhancement layer is controlled based on a closed-form formula which utilizes the residual data and quantization error of the base layer. The simulation results show that the proposed algorithm controls the frame quality of the enhancement layer in a simple operation, where the parameter decision algorithm is applied to each frame.

Resumo Limpo

multimedia data deliv mobil devic wireless channel internet complic bandwidth fluctuat varieti mobil devic scalabl video code develop extens havc solv problem sinc scalabl video codec provid various scalabl adapt bitstream channel condit termin type scalabl codec one use codec wire wireless multimedia communic system iptv stream servic scalabl multimedia communic system video qualiti fluctuat degrad visual percept signific import effici use target bit order maintain consist video qualiti achiev small distort variat throughout whole video sequenc scheme propos paper provid use function control video qualiti applic support scalabl wherea convent scheme propos control video qualiti h mpeg system propos algorithm decid quantiz paramet enhanc layer maintain consist video qualiti throughout entir sequenc video qualiti enhanc layer control base closedform formula util residu data quantiz error base layer simul result show propos algorithm control frame qualiti enhanc layer simpl oper paramet decis algorithm appli frame

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