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#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <complex.h>
#include "nfft3util.h"
#include "nfft3.h"
Go to the source code of this file.
Defines | |
#define | KERNEL(r) (1.0-fabs((double)(r))/((double)R/2)) |
define weights of kernel function for discrete Radon transform | |
Functions | |
int | polar_grid (int T, int R, double *x, double *w) |
generates the points x with weights w for the polar grid with T angles and R offsets | |
int | linogram_grid (int T, int R, double *x, double *w) |
generates the points x with weights w for the linogram grid with T slopes and R offsets | |
int | Inverse_Radon_trafo (int(*gridfcn)(), int T, int R, double *Rf, int NN, double *f, int max_i) |
computes the inverse discrete Radon transform of Rf on the grid given by gridfcn() with T angles and R offsets by a NFFT-based CG-type algorithm | |
int | main (int argc, char **argv) |
simple test program for the inverse discrete Radon transform |
Computes the inverse of the discrete Radon transform
given at the points of the polar or linogram grid and where
are the weights of the Dirichlet- or Fejer-kernel by 1D-FFTs and the 2D-iNFFT.
Definition in file inverse_radon.c.