Open AccessNew Adaptive Algorithms for GOP Size Control with Return Channel Suppression in Wyner-Ziv Video Coding
Author(s) -
Charles Yaacoub,
Joumana Farah,
Béatrice PesquetPopescu
Publication year - 2009
Publication title -
international journal of digital multimedia broadcasting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.164
H-Index - 17
eISSN - 1687-7586
pISSN - 1687-7578
DOI - 10.1155/2009/319021
Subject(s) - computer science , codec , algorithm , decoding methods , coding (social sciences) , channel (broadcasting) , context adaptive binary arithmetic coding , real time computing , data compression , telecommunications , mathematics , statistics
We present novel algorithms for adaptive GOP size control in distributed Wyner-Ziv video coding, where an H.264 video codec is used for intracoding of key frames. The proposed algorithms rely on theoretical calculations to estimate the bit rate necessary for the successful decoding of Wyner-Ziv frames without the need for a feedback channel, which makes the system suitable for broadcasting applications. Additionally, in regions where H.264 intracoding outperforms Wyner-Ziv coding, the system automatically switches to intracoding mode in order to improve the overall performance. Simulations results show a significant gain in the average PSNR that can reach 3 dB compared to pure H.264 intracoding, and 0.8 dB compared to fixed-GOP Wyner-Ziv coding
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