摘要
对小波变换用于子带编码时 ,有限长输入信号的延拓方法进行了研究。针对现有延拓方法的不足 ,提出了一种延拓方法———r因子拟周期延拓法。理论与实验均表明 ,采用该方法 ,可实现由任意小波分解信号的截取段延拓后精确重构原信号 ,优于现有的延拓方法 ,为小波变换在数据压缩中的应用开辟了一种有效途径。
The extension methods of finite length signals for sub band coding associated with wavelet transformation are investigated.Considering the weakness of the existing extension methods,an extension method is presented which is named r factor pseudo circular extension method.It turns out theoretically that the input signal can be reconstructed exactly from the truncated section of the analyzed signals by our method and the method is better than other existing extension methods,as shown in many examples.A new valid way is provided for wavelet transform application in data compression.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
2000年第5期112-115,共4页
Journal of Chongqing University
