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readimage.c
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Mon, Dec 30, 20:41

readimage.c
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#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include "wcs.h"
#include<fonction.h>
#include<constant.h>
#include<dimension.h>
#include<structure.h>
#include "lt.h"
/****************************************************************/
/* Program : grille */
/* Version : 1 mai 1992 */
/* Location : Obs. Toulouse */
/* Auteur : jean-paul */
/* EJ 26/12/05 : Modified in format 3 to include WCS
****************************************************************
*
* Read an image (eventually FITS) and extract the pixels that are inside
* the contour P.
*
* Parameter
* - P contains the contour of the image to be inversed
*
* Return an array of long int containing the image[nb_lin=ny][nb_col=nx]
* of the P->pixfile FITS file.
*/
double **readimage(struct g_pixel *P)
{
const extern struct g_mode M;
double x1, x2, y1, y2;
double xmin, xmax, ymin, ymax;
int i, j;
register int ii; //,jj;
FILE *IN;
int nx, ny;
double **zf;
char line[50];
char type[8];
char mode[4];
char nature[8];
char comments[1024];
double zz[10]; //zmin,zmax,
char *header;
IN = fopen(P->pixfile, "r");
if ( IN != NULL )
{
NPRINTF(stderr, "READ: image: %s - format: %d\n", P->pixfile, P->format);
if ((P->format == 0) || (P->format == -1))
{
rewind(IN);
if (P->header != 0)
for (ii = 0; ii < P->header; flire(IN, line), ii++);
if (P->format == 0)
fscanf(IN, "%d%d", &P->ny, &P->nx);
else
{
fscanf(IN, "%d%d%lf%lf%lf%lf", &P->ny, &P->nx, &x1, &x2, &y1, &y2);
P->pixelx = (x2 - x1) / ((double)(P->nx - 1));
P->pixely = (y2 - y1) / ((double)(P->ny - 1));
P->xmin = x1;
P->ymin = y1;
P->xmax = x2;
P->ymax = y2;
};
flire(IN, line);
for (ii = 0; ii < P->column; fscanf(IN, "%lf", &zz[ii]), ii++);
rewind(IN);
if (P->header != 0)
for (ii = 0; ii < P->header; flire(IN, line), ii++);
fscanf(IN, "%d%d", &P->ny, &P->nx);
flire(IN, line);
zf = (double **) alloc_square_double(P->ny, P->nx);
i = 0;
do
{
j = 0;
do
{
for (ii = 0; ii < P->column; fscanf(IN, "%lf", &zz[ii]), ii++);
flire(IN, line);
zf[i][j] = zz[P->column-1];
j++;
}
while (j < P->nx);
i++;
}
while (i < P->ny);
} /*end of if((P->format == 0)||(P->format == -1))*/
else if ((P->format == 1) || (P->format == 2))
{
if (P->format == 1)
{
zf = (double **)rdf_ipxs(P->pixfile, &nx, &ny,
type, mode, nature, comments);
P->ny = nx;
P->nx = ny;
NPRINTF(stderr, "\tdim %d %d, %s %s %s\n\t%s\n", nx, ny,
type, mode, nature, comments);
}
else
{
zf = (double **)rdf_ipx(P->pixfile, &ny, &nx,
type, mode, nature, comments, &xmin, &xmax, &ymin, &ymax);
P->ny = ny;
P->nx = nx;
P->pixelx = (xmax - xmin) / ((double)(P->nx - 1));
P->pixely = (ymax - ymin) / ((double)(P->ny - 1));
P->xmin = xmin;
P->ymin = ymin;
P->xmax = xmax;
P->ymax = ymax;
NPRINTF(stderr, "\tdim %d %d, %lf %lf %lf %lf\n\t%s %s %s\n\t%s\n",
nx, ny, xmin, xmax, ymin, ymax, type, mode, nature, comments);
};
} /*end of if ((P->format ==1)||(P->format ==2))*/
else if (P->format == 3)
{
zf = (double **)rdf_fits(P->pixfile, &nx, &ny, &header);
P->wcsinfo = wcsinit(header);
if (P->wcsinfo != NULL && M.iref != 0)
{
/*Permute axis if CRTYPE1 is DEC*/
pix2wcs(P->wcsinfo, 1., 1., &xmin, &ymin);
pix2wcs(P->wcsinfo, (double)nx, (double)ny, &xmax, &ymax);
}
else
{
NPRINTF(stderr, "WARN: No astrometrical data in %s\n", P->pixfile);
P->wcsinfo = NULL;
xmin = 1;
xmax = nx;
ymin = 1;
ymax = ny;
}
NPRINTF(stderr, "INFO: %s absolute bounds in degrees (RA %lf:%lf, DEC %lf:%lf)\n",
P->pixfile, xmin, xmax, ymin, ymax);
P->ny = ny;
P->nx = nx;
if (P->pixelx == 0. && P->pixely == 0. && M.iref != 0)
{
/*Convert to relative position in arcsec*/
P->xmin = xmin - M.ref_ra;
P->xmin *= -3600. * cos(M.ref_dec * DTR);
P->xmax = xmax - M.ref_ra;
P->xmax *= -3600. * cos(M.ref_dec * DTR);
P->ymin = ymin - M.ref_dec;
P->ymin *= 3600.;
P->ymax = ymax - M.ref_dec;
P->ymax *= 3600.;
P->pixelx = (P->xmax - P->xmin) / ((double)(P->nx - 1));
P->pixely = (P->ymax - P->ymin) / ((double)(P->ny - 1));
}
else
{
P->xmax = P->xmin + P->pixelx * (P->nx - 1);
P->ymax = P->ymin + P->pixely * (P->ny - 1);
}
NPRINTF(stderr, "INFO: %s relative bounds in arcsec (RA %lf:%lf, DEC %lf:%lf)\n",
P->pixfile, P->xmin, P->xmax, P->ymin, P->ymax);
NPRINTF(stderr, "INFO: Image size (%d %d) Resolution (%lf %lf) (\"/pix) \n",
nx, ny, P->pixelx, P->pixely);
} /*end of if (P->format==3)*/
else
{
fprintf(stderr, "FATAL ERROR: format %d not known\n", P->format);
exit(-1);
};
} /*end of if( IN != NULL )*/
else
{
fprintf(stderr, "ERROR: image %s not found\n", P->pixfile);
exit(-1);
};
fclose(IN);
if ((P->pixelx == 0.) || (P->pixely == 0.) || (P->xmin == P->xmax) || (P->ymin == P->ymax))
{
fprintf(stderr, "ERROR: image is not scaled !\n");
exit(-1);
};
// Compute sum of pixels
double fluxtot = 0;
for( i = 0; i < P->nx; i++ )
for( j = 0; j < P->ny; j++ )
fluxtot += zf[j][i];
P->meanFlux = fluxtot / P->nx / P->ny;
NPRINTF(stderr, "READ: done\n");
return(zf);
}

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