X樹非平衡保護多描述編碼

陳婧; 蔡燦輝; 丁潤濤

X樹非平衡保護多描述編碼

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出版歷程
- 收稿日期: 2004-07-22
- 修回日期: 2004-12-30
- 刊出日期: 2005-12-19

X-Tree Unequal Protected Multiple Description Coding

摘要

摘要: 本文提出了一種新的多描述圖像編碼方案X樹非平衡保護多描述子帶編碼。首先把小波變換圖像分解為結構信息和殘余非零系數(shù)。其中結構信息包括非零系數(shù)的位置、符號和位數(shù)，是小波變換圖像的關鍵信息，必須復制到每個描述。殘余非零系數(shù)則通過多描述標量量化器生成兩個索引分別放入不同的描述。兩個描述通過不同的信道進行傳輸。由于每個描述都包含了圖像的重要信息，因此，接收到一個信道的信息就可以重建出一定質(zhì)量的圖像。如果所有的信道傳輸?shù)男畔⒍急唤邮眨蜁玫奖热魏我粋€單獨信道更好的重建圖像。實驗結果驗證了本算法的有效性和正確性。
- 多描述編碼;子帶編碼;錯誤恢復;X樹編碼;非平衡保護
Abstract: A new Multiple Description Coding (MDC) scheme, X-tree based unequal protected MDC subband coding is proposed in this paper. The information of the wavelet transformed image is decomposed into two parts, the structure information and residues of significant coefficients. The structure information, including positions, signs and bit lengths of significant coefficients, is crucial and should be duplicated into both descriptions. The residues are mapped into couples of indices by a multiple description scalar quantizers, and sent to separate descriptions. Two descriptions are dispatched from different channels. Because every description includes all critical information of the picture, the reconstructed image from any single channel can have acceptable fidelity. The reconstructed image is of much better quality if both channels are available. Simulation results have verified the performance of the proposed algorithm.

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參考文獻(1)

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