Real-time decoding for LDPC based distributed video coding

Authors:
Tse-Chung Su;Yun-Chung Shen;Ja-Ling Wu
Affiliations:
Department of Computer Science and Information Engineering, National Taiwan University, Taipei, Taiwan;Graduate Institute of Networking and Multimedia, National Taiwan University, Taipei, Taiwan;Department of Computer Science and Information Engineering, National Taiwan University, Taipei, Taiwan
Venue:
MM '11 Proceedings of the 19th ACM international conference on Multimedia
Year:
2011

Citing 4
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Abstract

Wyner-Ziv (WZ) video coding -- a particular case of distributed video coding (DVC), is well known for its low-complexity encoding and high-complexity decoding characteristics. Although some works have been made in recent years, especially for improving the coding efficiency, most reported WZ codecs have high time delay in the decoder, which hinders its practical values for applications with critical timing constraint. In this paper, a fully parallelized sum-product algorithm (SPA) for low density parity check accumulate (LDPCA) codes is proposed and realized through Compute Unified Device Architecture (CUDA) based on General-Purpose Graphics Processing Unit (GPGPU). Simulation results show that, through our work, QCIF (surveillance) videos can be decoded in real-time with extremely high quality and without rate-distortion (RD) performance loss.