1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/*
* 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>
#include <vips/vips7compat.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
}
|
