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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/* creates an ideal filter.
*
* 02/01/14
* - from ideal.c
*/
/*
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
*/
/*
#define VIPS_DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <vips/vips.h>
#include "pcreate.h"
#include "point.h"
#include "pmask.h"
typedef struct _VipsMaskIdealBand {
VipsMask parent_instance;
double frequency_cutoff_x;
double frequency_cutoff_y;
double radius;
} VipsMaskIdealBand;
typedef VipsMaskClass VipsMaskIdealBandClass;
G_DEFINE_TYPE( VipsMaskIdealBand, vips_mask_ideal_band,
VIPS_TYPE_MASK );
static double
vips_mask_ideal_band_point( VipsMask *mask, double dx, double dy )
{
VipsMaskIdealBand *ideal_band = (VipsMaskIdealBand *) mask;
double fcx = ideal_band->frequency_cutoff_x;
double fcy = ideal_band->frequency_cutoff_y;
double r2 = ideal_band->radius * ideal_band->radius;
double d1 = (dx - fcx) * (dx - fcx) + (dy - fcy) * (dy - fcy);
double d2 = (dx + fcx) * (dx + fcx) + (dy + fcy) * (dy + fcy);
return( (d1 < r2 || d2 < r2) ? 1.0 : 0.0 );
}
static void
vips_mask_ideal_band_class_init( VipsMaskIdealBandClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
VipsMaskClass *mask_class = VIPS_MASK_CLASS( class );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
vobject_class->nickname = "mask_ideal_band";
vobject_class->description = _( "make an ideal band filter" );
mask_class->point = vips_mask_ideal_band_point;
VIPS_ARG_DOUBLE( class, "frequency_cutoff_x", 6,
_( "Frequency cutoff x" ),
_( "Frequency cutoff x" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsMaskIdealBand, frequency_cutoff_x ),
0.0, 1000000.0, 0.5 );
VIPS_ARG_DOUBLE( class, "frequency_cutoff_y", 7,
_( "Frequency cutoff y" ),
_( "Frequency cutoff y" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsMaskIdealBand, frequency_cutoff_y ),
0.0, 1000000.0, 0.5 );
VIPS_ARG_DOUBLE( class, "radius", 8,
_( "Radius" ),
_( "Radius of circle" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsMaskIdealBand, radius ),
0.0, 1000000.0, 0.1 );
}
static void
vips_mask_ideal_band_init( VipsMaskIdealBand *ideal_band )
{
ideal_band->frequency_cutoff_x = 0.5;
ideal_band->frequency_cutoff_y = 0.5;
ideal_band->radius = 0.1;
}
/**
* vips_mask_ideal_band:
* @out: (out): output image
* @width: image size
* @height: image size
* @frequency_cutoff_x: position of band
* @frequency_cutoff_y: position of band
* @radius: size of band
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @nodc: don't set the DC pixel
* * @reject: invert the filter sense
* * @optical: coordinates in optical space
* * @uchar: output a uchar image
*
* Make an ideal band-pass or band-reject filter, that is, one with a
* sharp cutoff around the point @frequency_cutoff_x, @frequency_cutoff_y,
* of size @radius.
*
* See also: vips_mask_ideal().
*
* Returns: 0 on success, -1 on error
*/
int
vips_mask_ideal_band( VipsImage **out, int width, int height,
double frequency_cutoff_x, double frequency_cutoff_y,
double radius, ... )
{
va_list ap;
int result;
va_start( ap, radius );
result = vips_call_split( "mask_ideal_band", ap, out, width, height,
frequency_cutoff_x, frequency_cutoff_y, radius );
va_end( ap );
return( result );
}
|
