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子带图象编码系统中对称扩展方法的研究

DOI: 10.11834/jig.2001012249

Keywords: 图象子带编码,综合滤波阵列,对称扩展,边界扩展效应,滤波器,线性卷积

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Abstract:

在子带图象编码系统中,有限长度信号序列(如图象信号),存在由线性卷积引起的边界扩展效应。传统方法一般用圆卷积和对称扩展方法来减弱边界扩展效应,但实验结果表明边界还存在失真。为此,按序列中每个周期的长度和对称中心的位置不同,将对称周期序列分为4种情况,并分别研究它们在图象子带编码中的对称扩展方法。实验结果表明,按这种对称扩展方法能使重构信号在边界处不存在任何失真。

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