tailieunhanh - Báo cáo hóa học: " Research Article Multiple Adaptations and Content-Adaptive FEC Using Parameterized RD Model for Embedded Wavelet Video"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Multiple Adaptations and Content-Adaptive FEC Using Parameterized RD Model for Embedded Wavelet Video | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 70914 13 pages doi 2007 70914 Research Article Multiple Adaptations and Content-Adaptive FEC Using Parameterized RD Model for Embedded Wavelet Video Ya-Huei Yu Chien-Peng Ho and Chun-Jen Tsai Department of Computer Science and Information Engineering National Chiao Tung University Hsinchu 30010 Taiwan Received 12 September 2006 Revised 16 February 2007 Accepted 16 April 2007 Recommended by Anthony Vetro Scalable video coding SVC has been an active research topic for the past decade. In the past most SVC technologies were based on a coarse-granularity scalable model which puts many scalability constraints on the encoded bitstreams. As a result the application scenario of adapting a preencoded bitstream multiple times along the distribution chain has not been seriously investigated before. In this paper a model-based multiple-adaptation framework based on a wavelet video codec MC-EZBC is proposed. The proposed technology allows multiple adaptations on both the video data and the content-adaptive FEC protection codes. For multiple adaptations of video data rate-distortion information must be embedded within the video bitstream in order to allow rate-distortion optimized operations for each adaptation. Experimental results show that the proposed method reduces the amount of side information by more than 50 on average when compared to the existing technique. It also reduces the number of iterations required to perform the tier-2 entropy coding by more than 64 on average. In addition due to the nondiscrete nature of the rate-distortion model the proposed framework also enables multiple adaptations of content-adaptive FEC protection scheme for more flexible error-resilient transmission of bitstreams. Copyright 2007 Ya-Huei Yu et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use .