Signal extension for orthogonal filter banks and its application to image coding

被引:0
|
作者
Uto, T [1 ]
Inoue, T [1 ]
Ikehara, M [1 ]
机构
[1] Keio Univ, Fac Sci & Technol, Yokohama, Kanagawa 2238522, Japan
来源
ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE | 2004年 / 87卷 / 03期
关键词
nonextension convolution; extension method; two-channel filter bank; orthogonality; image coding;
D O I
10.1002/ecjc.10125
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
In this paper, a signal extension method is proposed for realization of nonextension convolution in a two-channel orthogonal FIR filter bank. Methods of performing nonextension convolution include the symmetric extension method for a linear phase filter bank and the periodic extension method applicable to an arbitrary filter bank. However, the periodic extension method is not appropriate for image compression because it becomes discontinuous at the signal edge. In this paper, for application to an orthogonal filter bank, the input signal of the decomposed filter bank is extended in such a way that the input signal in the synthesized filter bank has symmetry similar to that in the symmetric extension method. In this way, nonextension convolution is realized. In this case,. it is shown that there are degrees of freedom in the extension signals determined by the input signal and the coefficients of the decomposed filter bank. The extended signal is calculated by singularity decomposition in such a way that the extended signal becomes smooth. Finally, the proposed method is applied to the coding of static images and the effectiveness of the method is demonstrated. (C) 2003 Wiley Periodicals, Inc.
引用
收藏
页码:41 / 48
页数:8
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