MV-based adaptive transcoding technique for reduced spatial resolution

Open/oop transcoder has been known as the fu.ste.st onefiir rediicedspatial resolution. but the qualify of its oiitpiit stream i.s pour. To improve the gnality, motion vector refinement (MVR) and intra-refi.c~h (IR) techniqne are piit ,forward. In this paper, we introdnce a new scheme in which each gronp IJ/ inacrohlr~cks (COMB, the soiirce neighboring macrohlncb fur dow-.sampling) con choose one strirctio-e for transcoding: openloop, MVR. or IR according to their motion vectors' condition. E-rperimental r.es~rlts how that this scheme is more eflicient than the architectirre onlv with IR or MVR'. lndex Terms down-sampling, Euclidean distance, motion vector, transcoding