tomopy/tomopy

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source/libtomo/prep/prep.c

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// 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
// Laboratory (ANL), which is operated by UChicago Argonne, LLC for the
// U.S. Department of Energy. The U.S. Government has rights to use,
// reproduce, and distribute this software.  NEITHER THE GOVERNMENT NOR
// UChicago Argonne, LLC MAKES ANY WARRANTY, EXPRESS OR IMPLIED, OR
// ASSUMES ANY LIABILITY FOR THE USE OF THIS SOFTWARE.  If software is
// modified to produce derivative works, such modified software should
// be clearly marked, so as not to confuse it with the version available
// from ANL.

// Additionally, redistribution and use in source and binary forms, with
// or without modification, are permitted provided that the following
// conditions are met:

//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.

//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in
//       the documentation and/or other materials provided with the
//       distribution.

//     * Neither the name of UChicago Argonne, LLC, Argonne National
//       Laboratory, ANL, the U.S. Government, nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.

// THIS SOFTWARE IS PROVIDED BY UChicago Argonne, LLC AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL UChicago
// Argonne, LLC OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

#include "libtomo/prep.h"

DLL void
normalize_bg(float* data, int dx, int dy, int dz, int nair)
{
    int   n, m, i, j, iproj;
    float air_left, air_right, air_slope, air;

    for(m = 0; m < dx; m++)
    {
        iproj = m * (dz * dy);

        for(n = 0; n < dy; n++)
        {
            i = iproj + n * dz;

            for(j = 0, air_left = 0, air_right = 0; j < nair; j++)
            {
                air_left += data[i + j];
                air_right += data[i + dz - 1 - j];
            }

            air_left /= (float) nair;
            air_right /= (float) nair;

            if(air_left <= 0.)
            {
                air_left = 1.;
            }
            if(air_right <= 0.)
            {
                air_right = 1.;
            }

            air_slope = (air_right - air_left) / (dz - 1);

            for(j = 0; j < dz; j++)
            {
                air         = air_left + air_slope * j;
                data[i + j] = data[i + j] / air;
            }
        }
    }
}