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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/*------------------------------------------------------------------------
* Copyright 2007-2009 (c) Jeff Brown <spadix@users.sourceforge.net>
*
* This file is part of the ZBar Bar Code Reader.
*
* The ZBar Bar Code Reader is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* The ZBar Bar Code Reader 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 Public License for more details.
*
* You should have received a copy of the GNU Lesser Public License
* along with the ZBar Bar Code Reader; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* http://sourceforge.net/projects/zbar
*------------------------------------------------------------------------*/
#include <Magick++.h>
#include <fstream>
#include <iostream>
#include <libgen.h>
#include <zbar.h>
using namespace std;
using namespace zbar;
#ifndef ZBAR_FIXED
#define ZBAR_FIXED 5
#endif
#define ZBAR_FRAC (1 << ZBAR_FIXED)
Decoder decoder;
Scanner scanner;
/* undocumented API for drawing cutesy debug graphics */
extern "C" void zbar_scanner_get_state(const zbar_scanner_t *scn, unsigned *x,
unsigned *cur_edge, unsigned *last_edge,
int *y0, int *y1, int *y2,
int *y1_thresh);
void scan_image(const char *filename)
{
scanner.reset();
// normally scanner would reset associated decoder,
// but this debug program connects them manually
// (to make intermediate state more readily available)
// so decoder must also be reset manually
decoder.reset();
Magick::Image image;
image.read(filename);
string file = image.baseFilename();
size_t baseidx = file.rfind('/');
if (baseidx != string::npos)
file = file.substr(baseidx + 1, file.length() - baseidx - 1);
ofstream svg((file + ".svg").c_str());
unsigned inwidth = image.columns();
unsigned width = inwidth + 3;
unsigned height = image.rows();
unsigned midy = height / 2;
cerr << "x+: " << midy << endl;
image.crop(Magick::Geometry(inwidth, 1, 0, midy));
svg << "<?xml version='1.0'?>" << endl
<< "<!DOCTYPE svg PUBLIC '-//W3C//DTD SVG 1.1//EN'"
<< " 'http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd'>" << endl
<< "<svg version='1.1' id='top'"
<< " width='10in' height='6in' preserveAspectRatio='xMinYMid slice'"
<< " overflow='visible' viewBox='0,0 " << width * 2 << ",384'"
<< " xmlns:xlink='http://www.w3.org/1999/xlink'"
<< " xmlns='http://www.w3.org/2000/svg'>" << endl
<< "<defs><style type='text/css'><![CDATA[" << endl
<< " * { stroke-linejoin: round; stroke-linecap: round;"
<< " stroke-width: .1; text-anchor: middle;"
<< " image-rendering: optimizeSpeed;"
<< " font-size: 6; font-weight: bold }" << endl
<< " path { fill: none }" << endl
<< " #zero { stroke: #00f }" << endl
<< " #edges { stroke: #f00 }" << endl
<< " #cur-edge { stroke: #f44 }" << endl
<< " #raw { stroke: orange }" << endl
<< " #y0 { stroke: yellow }" << endl
<< " #y1 { stroke: #0c0 }" << endl
<< " #y2 { stroke: #0aa }" << endl
<< " .y1thr { stroke: #f0f }" << endl
<< " rect.bar { fill: black }" << endl
<< " text.bar { fill: white }" << endl
<< " rect.space { fill: white }" << endl
<< " text.space { fill: black }" << endl
<< " text.data { fill: #44f; font-size: 16 }" << endl
<< "]]></style></defs>" << endl
<< "<image width='" << inwidth * 2 << "' height='384'"
<< " preserveAspectRatio='none'"
<< " xlink:href='" << file << ".png'/>" << endl
<< "<g transform='translate(1,384) scale(2,-.5)'>" << endl;
// brute force
unsigned raw[inwidth];
{
// extract scan from image pixels
image.modifyImage();
Magick::Pixels view(image);
Magick::PixelPacket *pxp = view.get(0, 0, inwidth, 1);
Magick::ColorYUV y;
double max = 0;
svg << "<path id='raw' d='M";
unsigned i;
for (i = 0; i < inwidth; i++, pxp++) {
y = *pxp;
if (max < y.y())
max = y.y();
raw[i] = (unsigned)(y.y() * 0x100);
svg << ((i != 1) ? " " : " L ") << i << "," << raw[i];
y.u(0);
y.v(0);
*pxp = y;
}
view.sync();
svg << "'/>" << endl << "</g>" << endl;
}
image.depth(8);
image.write(file + ".png");
// process scan and capture calculated values
unsigned cur_edge[width], last_edge[width];
int y0[width], y1[width], y2[width], y1_thr[width];
svg << "<g transform='translate(-3)'>" << endl;
for (unsigned i = 0; i < width; i++) {
int edge;
if (i < inwidth)
edge = scanner.scan_y(raw[i]);
else
edge = scanner.flush();
unsigned x;
zbar_scanner_get_state(scanner, &x, &cur_edge[i], &last_edge[i], &y0[i],
&y1[i], &y2[i], &y1_thr[i]);
if (edge) {
unsigned w = scanner.get_width();
if (w)
svg << "<rect x='" << (2. * (last_edge[i] - w) / ZBAR_FRAC)
<< "' width='" << (w * 2. / ZBAR_FRAC)
<< "' height='32' class='"
<< (scanner.get_color() ? "space" : "bar") << "'/>" << endl
<< "<text transform='translate("
<< ((2. * last_edge[i] - w) / ZBAR_FRAC) - 3
<< ",16) rotate(90)' class='"
<< (scanner.get_color() ? "space" : "bar") << "'>" << endl
<< w << "</text>" << endl;
zbar_symbol_type_t sym = decoder.decode_width(w);
if (sym > ZBAR_PARTIAL) {
svg << "<text transform='translate("
<< (2. * (last_edge[i] + w) / ZBAR_FRAC)
<< ",208) rotate(90)' class='data'>"
<< decoder.get_data_string() << "</text>" << endl;
}
} else if ((!i) ? last_edge[i] : last_edge[i] == last_edge[i - 1])
last_edge[i] = 0;
}
svg << "</g>" << endl
<< "<g transform='translate(-3,384) scale(2,-.5)'>" << endl
<< "<path id='edges' d='";
for (unsigned i = 0; i < width; i++)
if (last_edge[i])
svg << " M" << ((double)last_edge[i] / ZBAR_FRAC) << ",0v768";
svg << "'/>" << endl
<< "</g>" << endl
<< "<g transform='translate(-1,384) scale(2,-.5)'>" << endl
<< "<path id='y0' d='M";
for (unsigned i = 0; i < width; i++)
svg << ((i != 1) ? " " : " L ") << i << "," << y0[i];
svg << "'/>" << endl << "</g>" << endl;
svg << "<g transform='translate(-1,128) scale(2,-1)'>" << endl
<< "<line id='zero' x2='" << width << "'/>" << endl
<< "<path id='cur-edge' d='";
for (unsigned i = 1; i < width - 1; i++)
if (!last_edge[i + 1] && (cur_edge[i] != cur_edge[i + 1]))
svg << " M" << ((double)cur_edge[i] / ZBAR_FRAC) - 1 << ",-32v64";
svg << "'/>" << endl << "<path class='y1thr' d='M";
for (unsigned i = 0; i < width; i++)
svg << ((i != 1) ? " " : " L ") << i << "," << y1_thr[i];
svg << "'/>" << endl << "<path class='y1thr' d='M";
for (unsigned i = 0; i < width; i++)
svg << ((i != 1) ? " " : " L ") << i << "," << -y1_thr[i];
svg << "'/>" << endl << "<path id='y1' d='M";
for (unsigned i = 0; i < width; i++)
svg << ((i != 1) ? " " : " L ") << (i - 0.5) << "," << y1[i];
svg << "'/>" << endl << "<path id='y2' d='M";
for (unsigned i = 0; i < width; i++)
svg << ((i != 1) ? " " : " L ") << i << "," << y2[i];
svg << "'/>" << endl << "</g>" << endl;
svg << "</svg>" << endl;
}
int main(int argc, const char *argv[])
{
if (argc < 2) {
cerr << "ERROR: specify image file(s) to scan" << endl;
return (1);
}
for (int i = 1; i < argc; i++)
scan_image(argv[i]);
return (0);
}
|
