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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。
When wavelet transform is used for subband coding, the extension method of finite length input signal is studied. Aiming at the deficiency of the existing extension methods, a continuation method is proposed, which is quasi-periodic extension method of r-factor. Both theory and experiment show that this method can be used to accurately reconstruct the original signal by the extension of the intercepted segment of the arbitrary wavelet decomposition signal, which is better than the existing extension method and opens up a new application of wavelet transform in data compression Effective way.