tailieunhanh - Báo cáo hóa học: " Research Article Low-Complexity Multiple Description Coding of Video Based on 3D Block Transforms"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Low-Complexity Multiple Description Coding of Video Based on 3D Block Transforms | Hindawi Publishing Corporation EURASIP Journal on Embedded Systems Volume 2007 Article ID 38631 11 pages doi 2007 38631 Research Article Low-Complexity Multiple Description Coding of Video Based on 3D Block Transforms Andrey Norkin Atanas Gotchev Karen Egiazarian and Jaakko Astola Institute of Signal Processing Tampere University of Technology . Box 553 33101 Tampere Finland Received 28 July 2006 Revised 10 January 2007 Accepted 16 January 2007 Recommended by Noel Oconnor The paper presents a multiple description MD video coder based on three-dimensional 3D transforms. Two balanced descriptions are created from a video sequence. In the encoder video sequence is represented in a form of coarse sequence approximation shaper included in both descriptions and residual sequence details which is split between two descriptions. The shaper is obtained by block-wise pruned 3D-DCT. The residual sequence is coded by 3D-DCT or hybrid LOT DCT 3D-transform. The coding scheme is targeted to mobile devices. It has low computational complexity and improved robustness of transmission over unreliable networks. The coder is able to work at very low redundancies. The coding scheme is simple yet it outperforms some MD coders based on motion-compensated prediction especially in the low-redundancy region. The margin is up to 3 dB for reconstruction from one description. Copyright 2007 Andrey Norkin et al. This is an open access article distributed underthe Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Nowadays video is more often being encoded in mobile devices and transmitted over less reliable wireless channels. Traditionally the objective in video coding has been to achieve high compression which was attained with the cost of increasing encoding complexity. However portable devices such as camera phones still lack enough computational power and are

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