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引用次数: 0
摘要
线性去噪滤波器通常是低通滤波器，低通滤波器的主要参数是截止频率。低通滤波器通常是位移不变的，可以通过空间域的卷积或傅里叶域的乘法来实现。本文介绍了一种线性滤波器，这种滤波器不是以截止频率为特征，而是以噪声模型为特征。本文举例说明了这种线性滤波器在低剂量 X 射线计算机断层扫描（CT）中的应用。
A linear denoising filter is usually of lowpass type, and the main parameter in a lowpass filter is the cutoff frequency. The lowpass filters are normally shift invariant and can be implemented as convolution in the spatial domain or as multiplication in the Fourier domain. This paper presents a linear filter that is not characterized by its cutoff frequency but is characterized by the noise model. An example of such a linear filter is presented for low-dose X-ray computed tomography (CT).
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