The advance of video coding technology enables multiview video (MVV) or three-dimensional television (3-D TV) display for users with or without glasses. For mobile devices or wireless applications, a distributed video...
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The advance of video coding technology enables multiview video (MVV) or three-dimensional television (3-D TV) display for users with or without glasses. For mobile devices or wireless applications, a distributed video coder (DVC) can be utilized to shift the encoder complexity to decoder under the MVV coding framework, denoted as multiview distributed video coding (MDVC). We proposed to exploit both inter-and intraview video correlations to enhance side information (SI) and improve the MDVC performance: (1) based on the multiview motion estimation (MVME) framework, a categorized block matching prediction with fidelity weights (COMPETE) was proposed to yield a high quality SI frame for better DVC reconstructed images. (2) The block transform coefficient properties, i.e., DCs and ACs, were exploited to design the priority rate control for the turbo code, such that the DVC decoding can be carried out with fewest parity bits. In comparison, the proposed COMPETE method demonstrated lower time complexity, while presenting better reconstructed video quality. Simulations show that the proposed COMPETE can reduce the time complexity of MVME to 1.29 to 2.56 times smaller, as compared to previous hybrid MVME methods, while the image peak signal to noise ratios (PSNRs) of a decoded video can be improved 0.2 to 3.5 dB, as compared to H.264/AVC intracoding. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
This paper addresses the problem of physical-layer multicasting over single-cell point-to-multipoint communication. We consider a base station that needs to convey a common information to a group of users. We propose ...
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ISBN:
(纸本)9781538635315
This paper addresses the problem of physical-layer multicasting over single-cell point-to-multipoint communication. We consider a base station that needs to convey a common information to a group of users. We propose a wyner-ziv coder (WZC) based on doubly nested lattice quantization. In our scheme, we use the base layer generated by a standard coder as the decoder side information. Then, WZC is performed for enhancing the quality of the transmitted message. With the proposed layered coding, two enhancement messages will be generated, the first for all users and the second for only a subgroup of users with the best channel conditions. We optimize the scheme parameters in order to maximize the multicast rate and minimize the reconstruction distortion at all users. The efficiency of the proposed scheme is confirmed by the rate-distortion performance results that show significant decrease of the decoded signal distortion, compared to the basic multicasting scheme.
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