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do_itos.c
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Sun, Dec 29, 08:23

do_itos.c
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#include <math.h>
#include <constant.h>
#include <fonction.h>
/*
* nom: do_itos - lesn-tool
* auteur: Jean-Paul Kneib
* date: oct 94
* place: IoA cambridge
*/
/*
* transform a list of pixels of an image to the source plan
* quick version - PSF = dirac
*
* Global variables used :
* - M, imFrame, ps
* - in e_dpl() : G, lens, lens_table
* - in err_invim() : iline, radial, tangent, nrline, ntline
*/
void do_itos(double **im, struct pixlist *pl, int npl, double dlsds,
double **source, double **erreur,
int **imult)
{
extern struct g_pixel imFrame;
register int i, j, k, is, js;
const extern struct g_mode M;
const extern struct g_pixel ps;
struct point A, B;
double xx;
double xpix, ypix, xw, yw;
int offscl; // 0 if OK, 1 if offscale
// TO FORCE TO USE THE FIRST LOOP
// TODO : CORRECT THE SECOND LOOP (WCS)
imFrame.wcsinfo = NULL;
if (imFrame.wcsinfo == NULL)
{
/*According to the subsampling in the image plane
*for each subpixel in the image plane*/
for (k = 0; k < npl; k++)
for (i = 0; i < imFrame.ech; i++)
for (j = 0; j < imFrame.ech; j++)
{
xx = (double)imFrame.ech;
A.y = (double)pl[k].i + imFrame.pixely * (-.5 + (double)i / xx);
A.x = (double)pl[k].j + imFrame.pixelx * (-.5 + (double)j / xx);
/*convert relative wc in arcsec from image plane to source plane*/
e_dpl(&A, dlsds, &B);
/*convert from relative wc in arcsec to pixel in the source image*/
is = (int) ((B.y - ps.ymin) / ps.pixely);
js = (int) ((B.x - ps.xmin) / ps.pixelx);
/*fill the multiplicity, source and error images*/
if (is >= 0 && js >= 0 && is < ps.ny && js < ps.nx)
{
imult[is][js] += 1;
source[is][js] = ((imult[is][js] - 1) * source[is][js] +
pl[k].flux)
/ ((double)imult[is][js]);
erreur[is][js] = ((imult[is][js] - 1) * erreur[is][js] +
pl[k].flux * pl[k].flux)
/ ((double)imult[is][js]);
}
} /*end of for each subpixel in the image plane*/
} /*end of if(imFrame.wcsinfo==NULL)*/
else
{
for (k = 0; k < npl; k++)
{
A.y = imFrame.ymin + imFrame.pixely * (((double) pl[k].i) - .5 * (imFrame.ech - 1.) / imFrame.ech);
xx = imFrame.xmin + imFrame.pixelx * (((double) pl[k].j) - .5 * (imFrame.ech - 1.) / imFrame.ech);
for (i = 0; i < imFrame.ech; i++)
{
A.x = xx;
for (j = 0; j < imFrame.ech; j++)
{
e_dpl(&A, dlsds, &B);
if (ps.wcsinfo != NULL)
{
xw = B.x / (-3600.) / cos(M.ref_dec * DTR) + M.ref_ra;
yw = B.y / 3600. + M.ref_dec;
wcs2pix(ps.wcsinfo, xw, yw, &xpix, &ypix, &offscl);
is = (int)xpix;
js = (int)ypix;
}
else
{
is = (int) ((B.y - ps.ymin) / ps.pixely);
js = (int) ((B.x - ps.xmin) / ps.pixelx);
}
if ((is >= 0) && (js >= 0) && (is < ps.ny) && (js < ps.nx))
{
imult[is][js] += 1;
source[is][js] = ((imult[is][js] - 1) * source[is][js] +
pl[k].flux)
/ ((double)imult[is][js]);
erreur[is][js] = ((imult[is][js] - 1) * erreur[is][js] +
pl[k].flux * pl[k].flux)
/ ((double)imult[is][js]);
};
A.x += imFrame.pixelx / imFrame.ech * ((double) j);
};
A.y += imFrame.pixely / imFrame.ech * ((double) i);
};
};
} /*end of if imFrame.wcsinfo!=NULL*/
for (is = 0; is < ps.ny; is++)
for (js = 0; js < ps.nx; js++)
erreur[is][js] -= source[is][js] * source[is][js];
}

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