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phs_init.c
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/* $Id$
*
* (C) 2003-2007, Friedrich Woeger <woeger@kis.uni-freiburg.de>,
* Kiepenheuer-Institut für Sonnenphysik, Freiburg (Breisgau), Germany
* All rights reserved.
*
* 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 the Kiepenheuer-Institut 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 THE COPYRIGHT HOLDERS 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 THE
* COPYRIGHT OWNER 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
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* 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.
*/
/* =====================================================================
**
** core speckle routines
**
** =====================================================================
**
** uses: fftw3 library:
** http://www.fftw.org
**
** Library for fast fourier transform
**
** =====================================================================
**
** Author: F. Woeger
** Kiepenheuer-Institut fuer Sonnenphysik
** Freiburg, Germany
**
** Written 17. 06. 2003
**
** =====================================================================
*/
#include "speckle_core.h"
/****************************************************************************
***************TRIPLE CORRELATION PART FOR PHASE RECONSTRUCTION**************
****************************************************************************/
/*
* phs_init: initialise the phase matrices
*
* p1, p2: phases to be initialised
* nx, ny: size of images
*/
void phs_init(float *p1, float *p2, float *pc, slaveinfo l,
int maxk, int *shifts, float *origin)
{
static int INIT = 0;
static float *mask = NULL;
static long N;
long nx, ny;
long i;
long i1;
nx = l.sfsizex;
ny = l.sfsizey;
// compute elliptic mask
if ((INIT != l.max_rad) || ny != (N / nx)) {
N = nx * ny;
if (mask != NULL)
free(mask);
mask = ellmask(nx, ny, NULL, l.max_rad, l.max_rad);
INIT = l.max_rad;
}
// set phases
for (i = 0; i < maxk; i++) {
phs_idx(nx / 2 + shifts[2 * i], ny / 2 + shifts[2 * i + 1], nx, i1);
p1[i1] = origin[2 * i];
p1[i1 + 1] = origin[2 * i + 1];
p2[i1] = origin[2 * i];
p2[i1 + 1] = origin[2 * i + 1];
pc[i1 / 2] = 1.0;
phs_idx(nx / 2 - shifts[2 * i], ny / 2 - shifts[2 * i + 1], nx, i1);
p1[i1] = origin[2 * i];
p1[i1 + 1] = -origin[2 * i + 1];
p2[i1] = origin[2 * i];
p2[i1 + 1] = -origin[2 * i + 1];
pc[i1 / 2] = 1.0;
}
// reset phase values to decent values
for (i = 0; i < N; i++) {
p1[2 * i] *= mask[i];
p1[2 * i + 1] *= mask[i];
}
}