基于多线性子空间KL变换的可伸缩视频压缩方法

刘健; 吴飞; 姚蕾; 庄越挺

doi:10.3724/SP.J.1146.2009.00463

基于多线性子空间KL变换的可伸缩视频压缩方法

doi: 10.3724/SP.J.1146.2009.00463

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出版历程
- 收稿日期: 2009-04-02
- 修回日期: 2009-11-10
- 刊出日期: 2010-05-19

A Scalable Video Coding Scheme Using KL Transform in Multiple Linear Subspaces

摘要

摘要: 该文提出一种基于多线性子空间KL(Karhunen-Loeve)变换的可伸缩视频压缩算法。该算法将纹理不同的图像子块投影到多个线性子空间中去，然后分别进行KL变换编码，使得每个子空间内变换系数更接近高斯分布，从而最大限度地在变换编码阶段提高压缩效率。同时，该算法结合多尺度小波分解，实现了质量可伸缩的视频编码，提高了视频压缩率。通过与DCT、小波变换以及多向DCT算法进行比较，证明该算法可获得更好的率失真性能。
- 可伸缩视频编码; KL变换; 多线性子空间
Abstract: This paper proposes a novel transform coding method based on the Karhunen-Loeve (KL) transform in multiple linear spaces. This method uses multiple linear subspaces to approximate image signals, and use a KL transform for each linear subspace, so that the transform coefficients in each subspace is close to Gaussian, which effectively de-correlates the coefficients. An SNR-scalable video coding scheme is developed by combining the method with wavelet decomposition. Experiments prove that this scheme accomplishes better coding efficiency than the schemes employing DCT, DWT, and Directional DCT methods.

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