Abstract-In order to transmit pre-encoded digital video over heterogeneous networks, it becomes necessary to employ transcoding techniques that convert pre-encoded video streams into streams having different bit rates and quality. This process is referred to as rate shaping or rate adaptation. Such video transcoders save computational overheads incurred in the IDCT (stream decode) and DCT (stream encode) operations, by performing motion compensation (MC) in the frequency (block-DCT) domain (MC-DCT). MC-DCT involves pre-and postmultiplication of 8 × 8 DCT blocks with 8 × 8 matrices derived from motion vectors. The specific contribution of this work is towards developing a novel method for implementing the preand post-multiplication with minimum computational overhead. The proposed method gives time savings of upto 50% over normal block multiplication.
In order to transmit pre-encoded digital video over heterogeneous networks, it becomes necessary to employ transcoding techniques that convert pre-encoded video streams into streams having different bit rates and quality. Video transcoders save computational overheads incurred in the IDCT and DCT operations, by performing motion compensation (MC) in the frequency (block-DCT) domain (MC-DCT). Most of the computational complexity of the frequency-domain video transcoder comes from the MC-DCT operation. MC-DCT involves pre-and postmultiplication of
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