15 October 2012 Refining WZ rate estimation in DVC with feedback channel constraints
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Abstract
Distributed video coding (DVC) has attracted a lot of attention during the past decade as a new solution for video compression where the computationally most intensive operations are performed by the decoder instead of by the encoder. One very important issue in many current DVC solutions is the use of a feedback channel from the decoder to the encoder for the purpose of determining the rate of the coded stream. The use of such a feedback channel is not only impractical in storage applications but even in streaming scenarios feedback-channel usage may result in intolerable delays due to the typically large number of requests for decoding one frame. Instead of reverting to a feedback-free solution by adding complexity to the encoder for performing encoder-side rate estimation, as an alternative, in previous work we proposed to incorporate constraints on feedback channel usage. To cope better with rate fluctuations caused by changing motion characteristics, in this paper we propose a refined approach exploiting information available from already decoded frames at other temporal layers. The results indicate significant improvements for all test sequences (using a GOP of length four).
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Jürgen Slowack, Jürgen Slowack, Peter Lambert, Peter Lambert, Rik Van de Walle, Rik Van de Walle, } "Refining WZ rate estimation in DVC with feedback channel constraints", Proc. SPIE 8499, Applications of Digital Image Processing XXXV, 84990L (15 October 2012); doi: 10.1117/12.929536; https://doi.org/10.1117/12.929536
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