tomopy/tomopy

// Copyright (c) 2015, UChicago Argonne, LLC. All rights reserved.

// Copyright 2015. UChicago Argonne, LLC. This software was produced
// under U.S. Government contract DE-AC02-06CH11357 for Argonne National
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#include <stdlib.h>

#include "libtomo/stripe.h"

void
remove_stripe_sf(float* data, int dx, int dy, int dz, int size, int istart, int iend)
{
    int    i, j, k, p, s;
    float* avrage_row;
    float* smooth_row;

    // For each slice.
    for(s = istart; s < iend; s++)
    {
        avrage_row = (float*) calloc(dz, sizeof(float));
        smooth_row = (float*) calloc(dz, sizeof(float));

        // For each pixel.
        for(j = 0; j < dz; j++)
        {
            // For each projection.
            for(p = 0; p < dx; p++)
            {
                avrage_row[j] += data[j + s * dz + p * dy * dz] / dx;
            }
        }

        // We have now computed the average row of the sinogram.
        // Smooth it
        for(i = 0; i < dz; i++)
        {
            smooth_row[i] = 0;
            for(j = 0; j < size; j++)
            {
                k = i + j - size / 2;
                if(k < 0)
                    k = 0;
                if(k > dz - 1)
                    k = dz - 1;
                smooth_row[i] += avrage_row[k];
            }
            smooth_row[i] /= size;
        }

        // For each projection.
        for(p = 0; p < dx; p++)
        {
            // Subtract this difference from each row in sinogram.
            for(j = 0; j < dz; j++)
            {
                data[j + s * dz + p * dy * dz] -= (avrage_row[j] - smooth_row[j]);
            }
        }

        free(avrage_row);
        free(smooth_row);
    }
}