tailieunhanh - Báo cáo hóa học: " Research Article Joint Source-Channel Coding for Wavelet-Based Scalable Video Transmission Using an Adaptive Turbo Code"

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 Joint Source-Channel Coding for Wavelet-Based Scalable Video Transmission Using an Adaptive Turbo Code | Hindawi Publishing Corporation EURASIP Journal on Image and Video Processing Volume 2007 Article ID 47517 12 pages doi 2007 47517 Research Article Joint Source-Channel Coding for Wavelet-Based Scalable Video Transmission Using an Adaptive Turbo Code Naeem Ramzan Shuai Wan and Ebroul Izquierdo Electronic Engineering Department Queen Mary University of London Mile End Road London E1 4NS UK Received 20 August 2006 Revised 18 December 2006 Accepted 5 January 2007 Recommended by James E. Fowler An efficient approach for joint source and channel coding is presented. The proposed approach exploits the joint optimization of a wavelet-based scalable video coding framework and a forward error correction method based on turbo codes. The scheme minimizes the reconstructed video distortion at the decoder subject to a constraint on the overall transmission bitrate budget. The minimization is achieved by exploiting the source rate distortion characteristics and the statistics of the available codes. Here the critical problem of estimating the bit error rate probability in error-prone applications is discussed. Aiming at improving the overall performance of the underlying joint source-channel coding the combination of the packet size interleaver and channel coding rate is optimized using Lagrangian optimization. Experimental results show that the proposed approach outperforms conventional forward error correction techniques at all bit error rates. It also significantly improves the performance of end-to-end scalable video transmission at all channel bit rates. Copyright 2007 Naeem Ramzan et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION The design of robust video transmission techniques over heterogeneous and unreliable channels has been an active research area over the last decade. This is .