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crea_filtre.c
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Fri, Dec 27, 13:47

crea_filtre.c
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#include<stdio.h>
#include<string.h>
#include<math.h>
#include<fonction.h>
#include<constant.h>
#include<dimension.h>
#include<structure.h>
/* Create a square seeing filter for convolution in d_seeing() function.
* filtre[y][x] = ln(2)/(PI*seeing^2) * 2^{ -(x*x+y*y)/seeing^2 } (!!c'est normal??)
*/
void crea_filtre(double seeing, double scale, double **filtre, int n)
{
// char name[30];
register int i, j;
double x, y, s, sepix, nd, norm;
printf("GAUSSIAN\n");
sepix = seeing / scale; // seeing in pixel
s = (sepix * sepix / (4*log(2.)));
norm = PI * s; // PI*R^2 in pixels^2
nd = ((double) n) / 2.;
for (i = 0; i < n; i++)
{
y = i - nd;
for (j = 0; j < n; j++)
{
x = j - nd;
filtre[i][j] = exp(-1.*(x * x + y * y) / s) / norm;
}
}
// strcpy(name,"filtre");
/*
dim=2;
size[0]=n;
size[1]=n;
strcpy(type,"double");
strcpy(nature,"real");
strcpy(mode,"bin");
sprintf(comments,"filtre seeing");
wr_ipxs(name,filtre,dim,size,type,mode,nature,comments);
wrf_fits(name,filtre,n,n,0.,1.,0.,1.);
*/
}
/* Create a square seeing filter for convolution in d_seeing() function.
* filtre[y][x] = ln(2)/(PI*seeing^2) * 2^{ -(x*x+y*y)/seeing^2 } (!!c'est normal??)
*/
void crea_filtre_e(double seeing_a, double seeing_b, double seeing_angle, double scale, double **filtre, int n)
{
// char name[30];
register int i, j;
double x, y, s, s1, s2, sepix1, sepix2, nd, norm, ctheta, stheta, s2theta;
sepix1 = (seeing_a / scale)/(2.0*sqrt(2.0*log(2.0))); // seeing in pixel
sepix2 = (seeing_b / scale)/(2.0*sqrt(2.0*log(2.0))); // seeing in pixel
s = sepix1 * sepix2;
s1=2*sepix1*sepix1;
s2=2*sepix2*sepix2;
stheta=pow(sin((PI/180.0)*seeing_angle),2.0);
ctheta=pow(cos((PI/180.0)*seeing_angle),2.0);
s2theta=sin(2*(PI/180.0)*seeing_angle);
norm = 2*PI * s; // 2*PI*sigma1*sigma2 in pixels^2
nd = ((double) n) / 2.;
for (i = 0; i < n; i++)
{
y = i - nd;
for (j = 0; j < n; j++)
{
x = j - nd;
filtre[i][j] = exp(-1.*x*x*(ctheta/s1+stheta/s2)-1.*x*y*s2theta*(-1/(s2)+1/(s1))-1.*y*y*(stheta/s1+ctheta/s2)) / norm;
}
}
// strcpy(name,"filtre");
/*
dim=2;
size[0]=n;
size[1]=n;
strcpy(type,"double");
strcpy(nature,"real");
strcpy(mode,"bin");
sprintf(comments,"filtre seeing");
wr_ipxs(name,filtre,dim,size,type,mode,nature,comments);
wrf_fits(name,filtre,n,n,0.,1.,0.,1.);
*/
}

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