Optimized Multiple Description Lattice Vector Quantization for Wavelet Image Coding

Optimized Multiple Description Lattice Vector Quantization for Wavelet Image Coding
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小波图像编码的优化多重描述格矢量量化

DOI:
10.1109/tcsvt.2007.898646
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发表时间:
2007-07
影响因子:
8.4
通讯作者:
--
中科院分区:
工程技术1区
文献类型:
--
作者:

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多描述(MD)编码是在非优先级和不可预测的网络上稳健传输信息的一种很有前途的替代方案。针对小波变换后的图像,提出了一种基于MD格型矢量量化(MDLVQ)的有效MD图像编码方案。针对小波系数在不同子带上的特点,对MDLVQ进行了优化应用,包括合理构造小波系数向量、优化子格索引值等MDLVQ编码参数以及不同子带的量化精度。更重要的是,采用优化的侧解码来预测基于矢量间相关性的丢失信息,并提供了一种替代的传输方式来进一步减少侧失真。实验结果验证了该方案的有效性,其性能优于其他一些测试的MD图像编解码器,包括基于优化MD标量量化的编解码器。
Multiple description (MD) coding is a promising alternative for robust transmission of information over non-prioritized and unpredictable networks. In this paper, an effective MD image coding scheme is introduced based on the MD lattice vector quantization (MDLVQ) for the wavelet transformed images. In view of the characteristics of wavelet coefficients in different frequency subbands, MDLVQ is applied in an optimized way, including an appropriate construction of wavelet coefficient vectors, the optimization of MDLVQ encoding parameters such as the choice of sublattice index values and the quantization accuracy for different subbands. More importantly, optimized side decoding is employed to predict lost information based on inter-vector correlation and an alternative transmission way for further reducing side distortion. Experimental results validate the effectiveness of the proposed scheme with better performance than some other tested MD image codecs including that based on optimized MD scalar quantization.
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