103 lines
2.3 KiB
C
103 lines
2.3 KiB
C
/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <glib/gi18n-lib.h>
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#include <stdio.h>
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#include <math.h>
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#include <vips/vips.h>
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#include "pmosaicing.h"
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int
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vips__initialize( TiePoints *points )
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{
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if( vips__clinear( points ) ) {
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/* vips_clinear failed! Set some sensible fallback values.
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*/
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int i, j;
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double xdelta, ydelta, max_cor;
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double a1, a2;
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int *xref = &points->x_reference[0];
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int *yref = &points->y_reference[0];
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int *xsec = &points->x_secondary[0];
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int *ysec = &points->y_secondary[0];
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double *corr = &points->correlation[0];
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double *dx = &points->dx[0];
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double *dy = &points->dy[0];
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int npt = points->nopoints;
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max_cor = 0.0;
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for( i = 0; i < npt; i++ )
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if( corr[i] > max_cor )
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max_cor = corr[i];
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max_cor = max_cor - 0.04;
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xdelta = 0.0;
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ydelta = 0.0;
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j = 0;
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for( i = 0; i < npt; i++ )
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if( corr[i] >= max_cor ) {
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xdelta += xsec[i] - xref[i];
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ydelta += ysec[i] - yref[i];
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++j;
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}
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if( j == 0 ) {
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vips_error( "vips_initialize", "no tie points" );
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return( -1 );
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}
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xdelta = xdelta / j;
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ydelta = ydelta / j;
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for( i = 0; i < npt; i++ ) {
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dx[i] = (xsec[i] - xref[i]) - xdelta;
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dy[i] = (ysec[i] - yref[i]) - ydelta;
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}
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for( i = 0; i < npt; i++ ) {
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a1 = dx[i];
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a2 = dy[i];
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points->deviation[i] = sqrt( a1 * a1 + a2 * a2 );
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}
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points->l_scale = 1.0;
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points->l_angle = 0.0;
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points->l_deltax = xdelta;
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points->l_deltay = ydelta;
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}
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return( 0 );
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}
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