Adaptive distributed video coding with correlation estimation using expectation propagation

Lijuan Cui; Shuang Wang; Xiaoqian Jiang; Samuel Cheng

doi:10.1117/12.929357

15 October 2012 Adaptive distributed video coding with correlation estimation using expectation propagation

Lijuan Cui, Shuang Wang, Xiaoqian Jiang, Samuel Cheng

Proceedings Volume 8499, Applications of Digital Image Processing XXXV; 84990M (2012) https://doi.org/10.1117/12.929357
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

Distributed video coding (DVC) is rapidly increasing in popularity by the way of shifting the complexity from encoder to decoder, whereas no compression performance degrades, at least in theory. In contrast with conventional video codecs, the inter-frame correlation in DVC is explored at decoder based on the received syndromes of Wyner-Ziv (WZ) frame and side information (SI) frame generated from other frames available only at decoder. However, the ultimate decoding performances of DVC are based on the assumption that the perfect knowledge of correlation statistic between WZ and SI frames should be available at decoder. Therefore, the ability of obtaining a good statistical correlation estimate is becoming increasingly important in practical DVC implementations. Generally, the existing correlation estimation methods in DVC can be classified into two main types: pre-estimation where estimation starts before decoding and on-the-fly (OTF) estimation where estimation can be refined iteratively during decoding. As potential changes between frames might be unpredictable or dynamical, OTF estimation methods usually outperforms pre-estimation techniques with the cost of increased decoding complexity (e.g., sampling methods). In this paper, we propose a low complexity adaptive DVC scheme using expectation propagation (EP), where correlation estimation is performed OTF as it is carried out jointly with decoding of the factor graph-based DVC code. Among different approximate inference methods, EP generally offers better tradeoff between accuracy and complexity. Experimental results show that our proposed scheme outperforms the benchmark state-of-the-art DISCOVER codec and other cases without correlation tracking, and achieves comparable decoding performance but with significantly low complexity comparing with sampling method.

Citation Download Citation

Lijuan Cui, Shuang Wang, Xiaoqian Jiang, and Samuel Cheng "Adaptive distributed video coding with correlation estimation using expectation propagation", Proc. SPIE 8499, Applications of Digital Image Processing XXXV, 84990M (15 October 2012); https://doi.org/10.1117/12.929357

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