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#define IMAGER_NO_CONTEXT
#include "imager.h"
#include <math.h>
static double
gauss(int x, double std) {
return 1.0/(sqrt(2.0*PI)*std)*exp(-(double)(x)*(double)(x)/(2*std*std));
}
/* Counters are as follows
l: lines
i: columns
c: filter coeffs
ch: channels
pc: coeff equalization
*/
int
i_gaussian(i_img *im, double stddev) {
return i_gaussian2( im, stddev, stddev );
}
typedef struct s_gauss_coeff {
int diameter;
int radius;
double *coeff;
} t_gauss_coeff;
static t_gauss_coeff *build_coeff( i_img *im, double stddev ) {
double *coeff = NULL;
double pc;
int radius, diameter, i;
t_gauss_coeff *ret = mymalloc(sizeof(struct s_gauss_coeff));
ret->coeff = NULL;
if (im->bits <= 8)
radius = ceil(2 * stddev);
else
radius = ceil(3 * stddev);
diameter = 1 + radius * 2;
coeff = mymalloc(sizeof(double) * diameter);
for(i=0;i <= radius;i++)
coeff[radius + i]=coeff[radius - i]=gauss(i, stddev);
pc=0.0;
for(i=0; i < diameter; i++)
pc+=coeff[i];
for(i=0;i < diameter;i++) {
coeff[i] /= pc;
// im_log((aIMCTX, 1, "i_gaussian2 Y i=%i coeff=%.2f\n", i, coeff[i] ));
}
ret->diameter = diameter;
ret->radius = radius;
ret->coeff = coeff;
return ret;
}
static void free_coeff(t_gauss_coeff *co ) {
if( co->coeff != NULL )
myfree( co->coeff );
myfree( co );
}
#define img_copy(dest, src) i_copyto( (dest), (src), 0,0, (src)->xsize,(src)->ysize, 0,0);
int
i_gaussian2(i_img *im, double stddevX, double stddevY) {
int c, ch;
i_img_dim x, y;
double pc;
t_gauss_coeff *co = NULL;
double res[MAXCHANNELS];
i_img *timg;
dIMCTXim(im);
im_log((aIMCTX, 1,"i_gaussian2(im %p, stddev %.2f,%.2f)\n",im,stddevX,stddevY));
i_clear_error();
if (stddevX < 0) {
i_push_error(0, "stddevX must be positive");
return 0;
}
if (stddevY < 0) {
i_push_error(0, "stddevY must be positive");
return 0;
}
if( stddevX == stddevY && stddevY == 0 ) {
i_push_error(0, "stddevX or stddevY must be positive");
return 0;
}
/* totally silly cutoff */
if (stddevX > 1000) {
stddevX = 1000;
}
if (stddevY > 1000) {
stddevY = 1000;
}
timg = i_sametype(im, im->xsize, im->ysize);
if( stddevX > 0 ) {
/* Build Y coefficient matrix */
co = build_coeff( im, stddevX );
im_log((aIMCTX, 1, "i_gaussian2 X coeff radius=%i diamter=%i coeff=%p\n", co->radius, co->diameter, co->coeff));
}
else {
im_log((aIMCTX, 1, "i_gaussian2 X coeff is unity\n"));
}
#code im->bits <= 8
IM_COLOR rcolor;
i_img *yin;
i_img *yout;
if( stddevX > 0 ) {
/******************/
/* Process X blur */
im_log((aIMCTX, 1, "i_gaussian2 X blur from im=%p to timg=%p\n", im, timg));
for(y = 0; y < im->ysize; y++) {
for(x = 0; x < im->xsize; x++) {
pc=0.0;
for(ch=0;ch<im->channels;ch++)
res[ch]=0;
for(c = 0;c < co->diameter; c++)
if (IM_GPIX(im,x+c-co->radius,y,&rcolor)!=-1) {
for(ch=0;ch<im->channels;ch++)
res[ch]+= rcolor.channel[ch] * co->coeff[c];
pc+=co->coeff[c];
}
for(ch=0;ch<im->channels;ch++) {
double value = res[ch] / pc;
rcolor.channel[ch] = value > IM_SAMPLE_MAX ? IM_SAMPLE_MAX : IM_ROUND(value);
}
IM_PPIX(timg, x, y, &rcolor);
}
}
/* processing is im -> timg=yin -> im=yout */
yin = timg;
yout = im;
}
else {
/* processing is im=yin -> timg=yout -> im */
yin = im;
yout = timg;
}
if( stddevY > 0 ) {
if( stddevX != stddevY ) {
if( co != NULL ) {
free_coeff(co);
co = NULL;
}
/* Build Y coefficient matrix */
co = build_coeff( im, stddevY );
im_log((aIMCTX, 1, "i_gaussian2 Y coeff radius=%i diamter=%i coeff=%p\n", co->radius, co->diameter, co->coeff));
}
/******************/
/* Process Y blur */
im_log((aIMCTX, 1, "i_gaussian2 Y blur from yin=%p to yout=%p\n", yin, yout));
for(x = 0;x < im->xsize; x++) {
for(y = 0; y < im->ysize; y++) {
pc=0.0;
for(ch=0; ch<im->channels; ch++)
res[ch]=0;
for(c=0; c < co->diameter; c++)
if (IM_GPIX(yin, x, y+c-co->radius, &rcolor)!=-1) {
for(ch=0;ch<yin->channels;ch++)
res[ch]+= rcolor.channel[ch] * co->coeff[c];
pc+=co->coeff[c];
}
for(ch=0;ch<yin->channels;ch++) {
double value = res[ch]/pc;
rcolor.channel[ch] = value > IM_SAMPLE_MAX ? IM_SAMPLE_MAX : IM_ROUND(value);
}
IM_PPIX(yout, x, y, &rcolor);
}
}
if( im != yout ) {
im_log((aIMCTX, 1, "i_gaussian2 copying yout=%p to im=%p\n", yout, im));
img_copy( im, yout );
}
}
else {
im_log((aIMCTX, 1, "i_gaussian2 Y coeff is unity\n"));
if( yin==timg ) {
im_log((aIMCTX, 1, "i_gaussian2 copying timg=%p to im=%p\n", timg, im));
img_copy( im, timg );
}
}
im_log((aIMCTX, 1, "i_gaussian2 im=%p\n", im));
im_log((aIMCTX, 1, "i_gaussian2 timg=%p\n", timg));
im_log((aIMCTX, 1, "i_gaussian2 yin=%p\n", yin));
im_log((aIMCTX, 1, "i_gaussian2 yout=%p\n", yout));
#/code
if( co != NULL )
free_coeff(co);
i_img_destroy(timg);
return 1;
}
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