Adaptive nonseparable interpolation for image compression with directional wavelet transform

被引：22

作者：

Dong, Weisheng ^{[1
]}

Shi, Guangming ^{[1
]}

Xu, Jizheng ^{[2
]}

机构：

[1] Xidian Univ, Sch Elect Engn, Xian 710071, Peoples R China

[2] Microsoft Res Asia, Beijing 100080, Peoples R China

来源：

IEEE SIGNAL PROCESSING LETTERS | 2008年 / 15卷

基金：

中国国家自然科学基金;

关键词：

adaptive directional lifting; adaptive 2-D interpolation filter; rate-distortion optimization;

D O I：

10.1109/LSP.2007.914929

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The adaptive directional lifting-based wavelet transform (ADL) locally adapts the filtering directions to the local properties of the image. In this letter, instead of using the conventional interpolation filter for the directional prediction with fractional-pel accuracy, a new two-dimensional nonseparable adaptive interpolation filter is proposed. The adaptive filter is calculated for every fractional-pel direction so as to minimize the energy of the prediction error. The tradeoff between reducing the prediction error and the overhead to code the interpolation filter is discussed. This enables coding gains of up to 0.98 dB, compared to ADL coder, and up to 2.4 dB, compared to the JPEG 2000 for typical test images.

引用

页码：233 / 236

页数：4

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