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/*
* Brute force align the bands of an image.
*
* Copyright: Nottingham Trent University
* Author: Tom Vajzovic
* Written on: 2008-02-04
*/
/*
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 <glib/gi18n-lib.h>
#include <vips/vips.h>
/**
* im_align_bands:
* @in: image to align
* @out: output image
*
* This operation uses im_phasecor_fft() to find an integer displacement to
* align all image bands band 0. It is very slow and not very accurate.
*
* Use im_estpar() in preference: it's fast and accurate.
*
* See also: im_global_balancef(), im_remosaic().
*
* Returns: 0 on success, -1 on error
*/
int
im_align_bands(IMAGE *in, IMAGE *out)
{
#define FUNCTION_NAME "im_align_bands"
if (im_piocheck(in, out))
return -1;
if (1 == in->Bands)
return im_copy(in, out);
{
IMAGE **bands = IM_ARRAY(out, 2 * in->Bands, IMAGE *);
IMAGE **wrapped_bands = bands + in->Bands;
double x = 0.0;
double y = 0.0;
int i;
if (!bands ||
im_open_local_array(out, bands, in->Bands,
FUNCTION_NAME ": bands", "p") ||
im_open_local_array(out, wrapped_bands + 1, in->Bands - 1,
FUNCTION_NAME ": wrapped_bands", "p"))
return -1;
for (i = 0; i < in->Bands; ++i)
if (im_extract_band(in, bands[i], i))
return -1;
wrapped_bands[0] = bands[0];
for (i = 1; i < in->Bands; ++i) {
IMAGE *temp = im_open(FUNCTION_NAME ": temp", "t");
double this_x, this_y, val;
if (!temp ||
im_phasecor_fft(bands[i - 1], bands[i], temp) ||
im_maxpos_avg(temp, &this_x, &this_y, &val) ||
im_close(temp))
return -1;
x += this_x;
y += this_y;
if (im_wrap(bands[i], wrapped_bands[i], (int) x, (int) y))
return -1;
}
return im_gbandjoin(wrapped_bands, out, in->Bands);
}
#undef FUNCTION_NAME
}
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