A novel rate control algorithm in the heterogeneous transcoding

Abstract

This paper introdiices a novel rate control algorithm for heterogeneotls vi de^ transcoding jiom MPEG-2 to H.263. Fit..st, the psychovisiial propertie.7 of the lmman vi.siia1 .s.n7tem (HVS) are ntilizcd to remove percephral redimdancies Jiom I-frame.s. Second. according to the requirement of target hit rate and combining coding staiidard, we propose a new reyiiantiiatioii method fbr hererogeneoiis transcoder. Third. in order to improve fratiscoding efficieiicy a bit estimation model in the freqiiencv domain is suhstihited ,for the model in the spatial domain. Experimental results show that the proposed rate control scheme not only sign;ficant!v reduces the occwrence offrame skipping and reyvires milch less computation. biit also provides video quality almost as good as that of traditional method. I Index Terms JND(Jnst-noticeable-distortion), rate control, skipping frames, transcoding.