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학술지 Efficient Bit Allocation and Rate Control Algorithms for Hierarchical Video Coding
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서찬원, 강정원, 한종기, Truong Q. Nguyen
IEEE Transactions on Circuits and Systems for Video Technology, v.20 no.9, pp.1210-1223
10MR2400, 유무선 환경의 개방형 IPTV(IPTV 2.0) 기술개발, 류원
Hierarchical structure is a useful tool for providing the necessary scalability in adapting to the variety of channel environments. For schemes involving hierarchical picture structures, bit allocation, and rate control algorithms are vital components for improving video codec performance. Since conventional bit allocation schemes do not efficiently consider the hierarchical structure characteristics, it is difficult to optimize the video quality at an arbitrary bitrate. Similarly, conventional quantization parameter decision methods are not appropriate for controlling the bitrate generated by a codec using a hierarchical encoding structure. In this paper, we propose an effective bit allocation scheme that assigns the target number of bits to pictures or macroblocks (MBs) and improves the overall quality of images encoded by a hierarchical-based encoder. A rate control scheme is also proposed to ensure that the generated bitrate is equal to the assigned target bitrate. From the simulation results, the proposed schemes outperformed conventional methods from a rate-distortion perspective, by efficiently controlling the bitrate of the MB unit. The algorithms regulated the generated bits to achieve the target bits by using the proposed linear R-Q model. © 2010 IEEE.
KSP 제안 키워드
Allocation scheme, Control scheme, Conventional methods, Effective bit, Hierarchical encoding, Overall Quality, Q model, Quantization parameters, Rate Control, Structure characteristics, Video Codec