123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include "qfits.h"
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struct image {
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char filename[64];
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int naxis1,naxis2;
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float *zavg;
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double ra0,de0;
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float x0,y0;
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float a[3],b[3],xrms,yrms;
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double mjd;
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float exptime;
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char nfd[32];
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int cospar;
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};
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struct image read_fits(char *filename);
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int main(int argc,char *argv[])
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{
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int i;
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struct image img;
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float zavg,zstd,sx,sy,wx,wy;
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// Read image
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img=read_fits(argv[1]);
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// Compute statistics
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for (i=0,zavg=0.0;i<img.naxis1*img.naxis2;i++)
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zavg+=img.zavg[i];
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zavg/=(float) img.naxis1*img.naxis2;
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for (i=0,zstd=0.0;i<img.naxis1*img.naxis2;i++)
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zstd+=pow(img.zavg[i]-zavg,2);
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zstd=sqrt(zstd/(float) (img.naxis1*img.naxis2));
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// Image scale
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sx=sqrt(img.a[1]*img.a[1]+img.b[1]*img.b[1]);
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sy=sqrt(img.a[2]*img.a[2]+img.b[2]*img.b[2]);
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wx=img.naxis1*sx/3600.0;
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wy=img.naxis2*sy/3600.0;
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printf("%s %14.8lf %10.6f %10.6f %.2f %.2f %.2f %.2f %.2f %.2f %.1f %.1f\n",argv[1],img.mjd,img.ra0,img.de0,wx,wy,sx,sy,img.xrms,img.yrms,zavg,zstd);
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return 0;
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}
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// Read fits image
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struct image read_fits(char *filename)
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{
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int i,j,k,l,m;
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qfitsloader ql;
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char key[FITS_LINESZ+1];
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char val[FITS_LINESZ+1];
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struct image img;
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int naxis;
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// Copy filename
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strcpy(img.filename,filename);
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// Image size
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naxis=atoi(qfits_query_hdr(filename,"NAXIS"));
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img.naxis1=atoi(qfits_query_hdr(filename,"NAXIS1"));
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img.naxis2=atoi(qfits_query_hdr(filename,"NAXIS2"));
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// MJD
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img.mjd=(double) atof(qfits_query_hdr(filename,"MJD-OBS"));
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strcpy(img.nfd,qfits_query_hdr(filename,"DATE-OBS"));
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img.exptime=atof(qfits_query_hdr(filename,"EXPTIME"));
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// COSPAR ID
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img.cospar=atoi(qfits_query_hdr(filename,"COSPAR"));
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// Transformation
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img.mjd=atof(qfits_query_hdr(filename,"MJD-OBS"));
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img.ra0=atof(qfits_query_hdr(filename,"CRVAL1"));
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img.de0=atof(qfits_query_hdr(filename,"CRVAL2"));
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img.x0=atof(qfits_query_hdr(filename,"CRPIX1"));
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img.y0=atof(qfits_query_hdr(filename,"CRPIX2"));
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img.a[0]=0.0;
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img.a[1]=3600.0*atof(qfits_query_hdr(filename,"CD1_1"));
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img.a[2]=3600.0*atof(qfits_query_hdr(filename,"CD1_2"));
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img.b[0]=0.0;
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img.b[1]=3600.0*atof(qfits_query_hdr(filename,"CD2_1"));
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img.b[2]=3600.0*atof(qfits_query_hdr(filename,"CD2_2"));
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img.xrms=3600.0*atof(qfits_query_hdr(filename,"CRRES1"));
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img.yrms=3600.0*atof(qfits_query_hdr(filename,"CRRES2"));
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// Allocate image memory
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img.zavg=(float *) malloc(sizeof(float)*img.naxis1*img.naxis2);
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// Set parameters
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ql.xtnum=0;
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ql.ptype=PTYPE_FLOAT;
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ql.filename=filename;
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// Loop over planes
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if (naxis==3)
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ql.pnum=2;
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else
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ql.pnum=0;
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// Initialize load
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if (qfitsloader_init(&ql) != 0)
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printf("Error initializing data loading\n");
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// Test load
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if (qfits_loadpix(&ql) != 0)
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printf("Error loading actual data\n");
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// Fill z array
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for (i=0,l=0;i<img.naxis1;i++) {
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for (j=0;j<img.naxis2;j++) {
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img.zavg[l]=ql.fbuf[l];
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l++;
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}
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}
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return img;
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}
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