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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
// Copyright (C) 2009 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_INTEGRAL_IMAGE
#define DLIB_INTEGRAL_IMAGE
#include "integral_image_abstract.h"
#include "../algs.h"
#include "../assert.h"
#include "../geometry.h"
#include "../array2d.h"
#include "../matrix.h"
#include "../pixel.h"
#include "../noncopyable.h"
namespace dlib
{
// ----------------------------------------------------------------------------------------
template <
typename T
>
class integral_image_generic : noncopyable
{
public:
typedef T value_type;
long nr() const { return int_img.nr(); }
long nc() const { return int_img.nc(); }
template <typename image_type>
void load (
const image_type& img_
)
{
const_image_view<image_type> img(img_);
T pixel;
int_img.set_size(img.nr(), img.nc());
// compute the first row of the integral image
T temp = 0;
for (long c = 0; c < img.nc(); ++c)
{
assign_pixel(pixel, img[0][c]);
temp += pixel;
int_img[0][c] = temp;
}
// now compute the rest of the integral image
for (long r = 1; r < img.nr(); ++r)
{
temp = 0;
for (long c = 0; c < img.nc(); ++c)
{
assign_pixel(pixel, img[r][c]);
temp += pixel;
int_img[r][c] = temp + int_img[r-1][c];
}
}
}
value_type get_sum_of_area (
const rectangle& rect
) const
{
DLIB_ASSERT(get_rect(*this).contains(rect) == true && rect.is_empty() == false,
"\tvalue_type get_sum_of_area(rect)"
<< "\n\tYou have given a rectangle that goes outside the image"
<< "\n\tthis: " << this
<< "\n\trect.is_empty(): " << rect.is_empty()
<< "\n\trect: " << rect
<< "\n\tget_rect(*this): " << get_rect(*this)
);
T top_left = 0, top_right = 0, bottom_left = 0, bottom_right = 0;
bottom_right = int_img[rect.bottom()][rect.right()];
if (rect.left()-1 >= 0 && rect.top()-1 >= 0)
{
top_left = int_img[rect.top()-1][rect.left()-1];
bottom_left = int_img[rect.bottom()][rect.left()-1];
top_right = int_img[rect.top()-1][rect.right()];
}
else if (rect.left()-1 >= 0)
{
bottom_left = int_img[rect.bottom()][rect.left()-1];
}
else if (rect.top()-1 >= 0)
{
top_right = int_img[rect.top()-1][rect.right()];
}
return bottom_right - bottom_left - top_right + top_left;
}
void swap(integral_image_generic& item)
{
int_img.swap(item.int_img);
}
private:
array2d<T> int_img;
};
template <
typename T
>
void swap (
integral_image_generic<T>& a,
integral_image_generic<T>& b
) { a.swap(b); }
// ----------------------------------------------------------------------------------------
typedef integral_image_generic<long> integral_image;
// ----------------------------------------------------------------------------------------
template <typename integral_image_type>
typename integral_image_type::value_type haar_x (
const integral_image_type& img,
const point& p,
long width
)
{
DLIB_ASSERT(get_rect(img).contains(centered_rect(p,width,width)) == true,
"\tlong haar_x(img,p,width)"
<< "\n\tYou have given a point and with that goes outside the image"
<< "\n\tget_rect(img): " << get_rect(img)
<< "\n\tp: " << p
<< "\n\twidth: " << width
);
rectangle left_rect;
left_rect.set_left ( p.x() - width / 2 );
left_rect.set_top ( p.y() - width / 2 );
left_rect.set_right ( p.x()-1 );
left_rect.set_bottom ( left_rect.top() + width - 1 );
rectangle right_rect;
right_rect.set_left ( p.x() );
right_rect.set_top ( left_rect.top() );
right_rect.set_right ( left_rect.left() + width -1 );
right_rect.set_bottom ( left_rect.bottom() );
return img.get_sum_of_area(right_rect) - img.get_sum_of_area(left_rect);
}
// ----------------------------------------------------------------------------
template <typename integral_image_type>
typename integral_image_type::value_type haar_y (
const integral_image_type& img,
const point& p,
long width
)
{
DLIB_ASSERT(get_rect(img).contains(centered_rect(p,width,width)) == true,
"\tlong haar_y(img,p,width)"
<< "\n\tYou have given a point and with that goes outside the image"
<< "\n\tget_rect(img): " << get_rect(img)
<< "\n\tp: " << p
<< "\n\twidth: " << width
);
rectangle top_rect;
top_rect.set_left ( p.x() - width / 2 );
top_rect.set_top ( p.y() - width / 2 );
top_rect.set_right ( top_rect.left() + width - 1 );
top_rect.set_bottom ( p.y()-1 );
rectangle bottom_rect;
bottom_rect.set_left ( top_rect.left() );
bottom_rect.set_top ( p.y() );
bottom_rect.set_right ( top_rect.right() );
bottom_rect.set_bottom ( top_rect.top() + width - 1 );
return img.get_sum_of_area(bottom_rect) - img.get_sum_of_area(top_rect);
}
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_INTEGRAL_IMAGE
|
