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
|
#include "imager.h"
static float
gauss(int x,float std) {
return 1.0/(sqrt(2.0*PI)*std)*exp(-(float)(x)*(float)(x)/(2*std*std));
}
/* Counters are as follows
l: lines
i: columns
c: filter coeffs
ch: channels
pc: coeff equalization
*/
void
i_gaussian(i_img *im,float stdev) {
int i,l,c,ch;
float pc;
float coeff[21];
i_color rcolor;
float res[11];
i_img timg;
mm_log((1,"i_gaussian(im %p, stdev %.2f)\n",im,stdev));
i_img_empty_ch(&timg,im->xsize,im->ysize,im->channels);
for(i=0;i<11;i++) coeff[10+i]=coeff[10-i]=gauss(i,stdev);
pc=0;
for(i=0;i<21;i++) pc+=coeff[i];
for(i=0;i<21;i++) coeff[i]/=pc;
for(l=0;l<im->ysize;l++) {
for(i=0;i<im->xsize;i++) {
pc=0.0;
for(ch=0;ch<im->channels;ch++) res[ch]=0;
for(c=0;c<21;c++)
if (i_gpix(im,i+c-10,l,&rcolor)!=-1) {
for(ch=0;ch<im->channels;ch++) res[ch]+=(float)(rcolor.channel[ch])*coeff[c];
pc+=coeff[c];
}
for(ch=0;ch<im->channels;ch++) rcolor.channel[ch]=(unsigned char)(((res[ch]/(float)(pc)>255.0)?255.0:res[ch]/(float)(pc)));
i_ppix(&timg,i,l,&rcolor);
}
}
for(l=0;l<im->xsize;l++) {
for(i=0;i<im->ysize;i++) {
pc=0.0;
for(ch=0;ch<im->channels;ch++) res[ch]=0;
for(c=0;c<21;c++)
if (i_gpix(&timg,l,i+c-10,&rcolor)!=-1) {
for(ch=0;ch<im->channels;ch++) res[ch]+=(float)(rcolor.channel[ch])*coeff[c];
pc+=coeff[c];
}
for(ch=0;ch<im->channels;ch++) rcolor.channel[ch]=(unsigned char)(((res[ch]/(float)(pc)>255.0)?255.0:res[ch]/(float)(pc)));
i_ppix(im,l,i,&rcolor);
}
}
i_img_exorcise(&timg);
}
|
