Revisit of the Ramp Filter.

Revisit of the Ramp Filter.
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DOI:
10.1109/tns.2014.2363776
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发表时间:
2015-02
影响因子:
1.8
通讯作者:
Zeng GL
Zeng GL
中科院分区:
工程技术3区
文献类型:
--
作者:
Zeng GL

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滤波反投影(FBP)算法的一个重要部分是斜坡滤波器。本文推导了斜波滤波器在傅立叶域的离散形式,并研究了加窗效应。当用窗函数控制噪声时,图像的幅度会受到影响而降低。当必须使用窗函数时,提出了一种简单的补救措施来提高图像精度。
An important part of the filtered backprojection (FBP) algorithm is the ramp filter. This paper derives the discrete version of the ramp filter in the Fourier domain and studies the windowing effects. When a window function is used to control the noise, the image amplitude will be affected and reduced. A simple remedy is proposed to improve the image accuracy when a window function must be used.