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平移不变的小波域近邻系数阈值MR图像去噪

DOI: 10.11834/jig.20090709

Keywords: 磁共振,图像,去噪,平移不变,近邻系数阈值,复数统一体

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Abstract:

传统的小波域阈值去噪方法是根据每个小波系数各自的幅度大小进行相应的阈值修正,没有考虑到尺度间以及尺度内近邻的小波系数与当前小波系数的相关性,而使信号得不到更准确的估计。根据信号和噪声在尺度间的不同传播特性和尺度内近邻小波系数的相关性,设计出一种平移不变(TI)的近邻系数阈值策略,并依据磁共振成像(MRI)噪声图像的特点,结合复数域统一体去噪方法,提出了一种新颖的基于平移不变的小波域近邻系数阈值MR图像去噪算法。实验表明该算法能更准确地估计信号,且与几种磁共振(MR)图像去噪算法相比具有更好的去噪效果。

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