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/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <math.h>
#include <vips/vips.h>
#include "pmosaicing.h"
int
im__initialize( TIE_POINTS *points )
{
if( im__clinear( points ) ) {
/* im_clinear failed! Set some sensible fallback values.
*/
int i, j;
double xdelta, ydelta, max_cor;
double a1, a2;
int *xref = &points->x_reference[0];
int *yref = &points->y_reference[0];
int *xsec = &points->x_secondary[0];
int *ysec = &points->y_secondary[0];
double *corr = &points->correlation[0];
double *dx = &points->dx[0];
double *dy = &points->dy[0];
int npt = points->nopoints;
max_cor = 0.0;
for( i = 0; i < npt; i++ )
if( corr[i] > max_cor )
max_cor = corr[i];
max_cor = max_cor - 0.04;
xdelta = 0.0;
ydelta = 0.0;
j = 0;
for( i = 0; i < npt; i++ )
if( corr[i] >= max_cor ) {
xdelta += xsec[i] - xref[i];
ydelta += ysec[i] - yref[i];
++j;
}
if( j == 0 ) {
vips_error( "im_initialize", "no tie points" );
return( -1 );
}
xdelta = xdelta / j;
ydelta = ydelta / j;
for( i = 0; i < npt; i++ ) {
dx[i] = (xsec[i] - xref[i]) - xdelta;
dy[i] = (ysec[i] - yref[i]) - ydelta;
}
for( i = 0; i < npt; i++ ) {
a1 = dx[i];
a2 = dy[i];
points->deviation[i] = sqrt( a1 * a1 + a2 * a2 );
}
points->l_scale = 1.0;
points->l_angle = 0.0;
points->l_deltax = xdelta;
points->l_deltay = ydelta;
}
return( 0 );
}
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