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
|
/* -*- mode: c -*-
*/
/*
GIFT, a flexible content based image retrieval system.
Copyright (C) 1998, 1999, 2000, 2001, 2002, CUI University of Geneva
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "typedefs.h"
int normaliseContrast(float *inoutImage,
int NumPixels){
float lMinimalPixel, lMaximalPixel, lNormalisingFactor;
int i;
lMaximalPixel = inoutImage[0];
lMinimalPixel = inoutImage[0];
for (i = 1; i < NumPixels; i++) {
if (inoutImage[i] > lMaximalPixel)
lMaximalPixel = inoutImage[i];
else if (inoutImage[i] < lMinimalPixel)
lMinimalPixel = inoutImage[i];
}
if (fabs(lMinimalPixel - lMaximalPixel) < 1e-10) {
fprintf(stderr, "Can't normalise this Image\n");
return 1;
}
lNormalisingFactor =
(float) (MAX_BYTE - MIN_BYTE)
/(lMaximalPixel - lMinimalPixel);
for (i = 0; i < NumPixels; i++) {
inoutImage[i] -= lMinimalPixel * lNormalisingFactor;
inoutImage[i] += MIN_BYTE;
}
return 0;
}
|
