100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/*
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* Brute force align the bands of an image.
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*
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* Copyright: Nottingham Trent University
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* Author: Tom Vajzovic
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* Written on: 2008-02-04
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*/
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/*
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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 <vips/vips.h>
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#include <vips/vips7compat.h>
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/**
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* im_align_bands:
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* @in: image to align
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* @out: output image
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*
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* This operation uses im_phasecor_fft() to find an integer displacement to
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* align all image bands band 0. It is very slow and not very accurate.
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*
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* Use im_estpar() in preference: it's fast and accurate.
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*
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* See also: im_global_balancef(), im_remosaic().
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*
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* Returns: 0 on success, -1 on error
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*/
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int im_align_bands( IMAGE *in, IMAGE *out ){
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#define FUNCTION_NAME "im_align_bands"
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if( im_piocheck( in, out ))
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return -1;
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if( 1 == in-> Bands )
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return im_copy( in, out );
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{
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IMAGE **bands= IM_ARRAY( out, 2 * in-> Bands, IMAGE* );
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IMAGE **wrapped_bands= bands + in-> Bands;
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double x= 0.0;
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double y= 0.0;
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int i;
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if( ! bands || im_open_local_array( out, bands, in-> Bands, FUNCTION_NAME ": bands", "p" )
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|| im_open_local_array( out, wrapped_bands + 1, in-> Bands - 1, FUNCTION_NAME ": wrapped_bands", "p" ))
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return -1;
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for( i= 0; i < in-> Bands; ++i )
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if( im_extract_band( in, bands[i], i ))
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return -1;
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wrapped_bands[ 0 ]= bands[0];
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for( i= 1; i < in-> Bands; ++i ){
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IMAGE *temp= im_open( FUNCTION_NAME ": temp", "t" );
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double this_x, this_y, val;
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if( ! temp || im_phasecor_fft( bands[i-1], bands[i], temp )
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|| im_maxpos_avg( temp, & this_x, & this_y, & val ) || im_close( temp ))
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return -1;
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x+= this_x;
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y+= this_y;
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if( im_wrap( bands[i], wrapped_bands[i], (int) x, (int) y ))
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return -1;
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}
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return im_gbandjoin( wrapped_bands, out, in-> Bands );
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}
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#undef FUNCTION_NAME
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}
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