Hash signature saving in distributed video coding

• Published in: Frontiers of information technology & electronic engineering Vol. 12; no. 2; pp. 163 - 170
• Main Authors: Chen, Xin-hao, Zhu, Xing-guo, Shen, Xiao-lin, Yu, Lu
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Zhejiang University Press 01.02.2011; Springer Nature B.V
• Subjects: Blocking; Coding; Communications Engineering; Computer Hardware; Computer Science; Computer Systems Organization and Communication Networks; Electrical Engineering; Electronics and Microelectronics; Hash based algorithms; Instrumentation; Mathematical models; Networks; Noise; Random variables; Signatures; Temporal logic; Distributed video coding (DVC); Hash; Laplacian; TN919.8
• ISSN: 1869-1951; 2095-9184; 1869-196X; 2095-9230
• DOI: 10.1631/jzus.C1000008

In transform-domain distributed video coding （DVC）, the correlation noises （denoted as N） between the source block and its temporal predictor can be modeled as Laplacian random variables. In this paper we propose that the noises （denoted as N＇） between the source block and its co-located block in a reference frame can also be modeled as Laplacian random variables. Furthermore, it is possible to exploit the relationship between N and N＇ to improve the performance of the DVC system. A practical scheme based on theoretical insights, the hash signature saving scheme, is proposed. Experimental results show that the proposed scheme saves on average 83.2% of hash signatures, 13.3% of bit-rate, and 3.9% of encoding time.