iradon
逆ra逆变换
Syntax
描述
specifies parameters to use in the inverse Radon transform. You can specify any combination of the last four arguments.I
= iradon(R
,theta
,interp
,筛选
,frequency_scaling
,output_size
)iradon
uses default values for arguments that you omit.
例子
输入参数
Output Arguments
算法
iradon
假设旋转中心是投影的中心点,定义为ceil(size(R,1)/2)
.
iradon
uses the filtered back projection algorithm to perform the inverse Radon transform. The filter is designed directly in the frequency domain and then multiplied by the FFT of the projections. The projections are zero-padded to a power of 2 before filtering to prevent spatial domain aliasing and to speed up the FFT.
参考
[1] Kak, A. C., and M. Slaney,Principles of Computerized Tomographic Imaging, New York, NY, IEEE Press, 1988.