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문철하,홍성훈 전남대학교 전자통신기술연구소 2002 전자통신기술논문지 Vol.5 No.1
Numerous applications for video transmission and storage are being developed based on the MPEG-2 video coding standard. Applications such as VoD, trick-play track on digital VTR's and extended-play recoding on VTR's motivate the idea of MPEG video transcoding. In general, by using the requantization, MPEG video transcoder reduces the bit-rate of incoming bit stream to the lower bit rate to meet the bandwidth of output links. In this paper, we investigates the requantization characteristics for MPEG-2 transcoding and it is shown that requantization effects produce the irregular size of decision intervals. From the investigation, we design the joint quantiation model with the same characteristics as the combination of quantization in encoder and requantization in transcoder. The simulation results show that the joint quantiation model is corrected.