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
|
/*====================================================================*
- Copyright (C) 2001 Leptonica. All rights reserved.
- This software is distributed in the hope that it will be
- useful, but with NO WARRANTY OF ANY KIND.
- No author or distributor accepts responsibility to anyone for the
- consequences of using this software, or for whether it serves any
- particular purpose or works at all, unless he or she says so in
- writing. Everyone is granted permission to copy, modify and
- redistribute this source code, for commercial or non-commercial
- purposes, with the following restrictions: (1) the origin of this
- source code must not be misrepresented; (2) modified versions must
- be plainly marked as such; and (3) this notice may not be removed
- or altered from any source or modified source distribution.
*====================================================================*/
/*
* pagesegtest3.c
*
* Demonstrates morphological approach to segmenting images.
*
* pagesegtest3 filein fileout
*
* where:
* filein: 1, 8 or 32 bpp page image
* fileout: photomask for image regions at full resolution
*
* This example shows how to use the morphseq specification of
* a sequence of morphological and reduction/expansion operations.
*
* This is much simpler than generating the structuring elements
* for the morph operations, specifying each of the function
* calls, keeping track of the intermediate images, and removing
* them at the end.
*
* The specific sequences below tend to work ok for images scanned at
* about 600 ppi.
*/
#include <stdio.h>
#include <stdlib.h>
#include "allheaders.h"
/* Mask at 4x reduction */
static const char *mask_sequence = "r11";
/* Seed at 4x reduction, formed by doing a 16x reduction,
* an opening, and finally a 4x replicative expansion. */
static const char *seed_sequence = "r1143 + o5.5+ x4";
/* Simple dilation */
static const char *dilation_sequence = "d3.3";
#define DFLAG 1
main(int argc,
char **argv)
{
char *filein, *fileout;
l_int32 thresh;
PIX *pixs, *pixg, *pixb;
PIX *pixmask4, *pixseed4, *pixsf4, *pixd4, *pixd;
static char mainName[] = "pagesegtest3";
if (argc != 4)
exit(ERROR_INT(" Syntax: pagesegtest3 filein thresh fileout",
mainName, 1));
filein = argv[1];
thresh = atoi(argv[2]);
fileout = argv[3];
/* Get a 1 bpp version of the page */
if ((pixs = pixRead(filein)) == NULL)
exit(ERROR_INT("pixs not made", mainName, 1));
if (pixGetDepth(pixs) == 32)
pixg = pixConvertRGBToGrayFast(pixs);
else
pixg = pixClone(pixs);
if (pixGetDepth(pixg) == 8)
pixb = pixThresholdToBinary(pixg, thresh);
else
pixb = pixClone(pixg);
/* Make seed and mask, and fill seed into mask */
pixseed4 = pixMorphSequence(pixb, seed_sequence, 0);
pixmask4 = pixMorphSequence(pixb, mask_sequence, 0);
pixsf4 = pixSeedfillBinary(NULL, pixseed4, pixmask4, 8);
pixd4 = pixMorphSequence(pixsf4, dilation_sequence, 0);
/* Mask at full resolution */
pixd = pixExpandBinaryPower2(pixd4, 4);
pixWrite(fileout, pixd, IFF_TIFF_G4);
/* Extract non-image parts (e.g., text) at full resolution */
pixSubtract(pixb, pixb, pixd);
pixDisplayWithTitle(pixseed4, 400, 100, "halftone seed", DFLAG);
pixDisplayWithTitle(pixmask4, 100, 100, "halftone seed mask", DFLAG);
pixDisplayWithTitle(pixd4, 700, 100, "halftone mask", DFLAG);
pixDisplayWithTitle(pixb, 1000, 100, "non-halftone", DFLAG);
#if 1
pixWrite("junkseed", pixseed4, IFF_TIFF_G4);
pixWrite("junkmask", pixmask4, IFF_TIFF_G4);
pixWrite("junkfill", pixd4, IFF_TIFF_G4);
pixWrite("junktext", pixb, IFF_TIFF_G4);
#endif
pixDestroy(&pixs);
pixDestroy(&pixg);
pixDestroy(&pixb);
pixDestroy(&pixseed4);
pixDestroy(&pixmask4);
pixDestroy(&pixsf4);
pixDestroy(&pixd4);
pixDestroy(&pixd);
exit(0);
}
|
