public software.sextractor

 /*

                                psf.h

*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

*

*       Part of:        SExtractor

*

*       Authors:        E.BERTIN (IAP)

*                       P.DELORME (LAOG)

*

*       Contents:       Include file for psffit.c.

*

*       Last modify:    14/12/2009

*

*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

*/

/*----------------------------- Internal constants --------------------------*/

#define PSF_MAXSHIFT    20.0    /* Max shift from initial guess (pixels)*/

#define PSF_MINSHIFT    1e-3    /* Min shift from previous guess (pixels)*/

#define PSF_NITER       20      /* Maximum number of iterations in fit */

#define PSF_NA          3       /* Number of fitted parameters per component */

#define PSF_NTOT        (PSF_NA*PSF_NPSFMAX)    /* Number of fitted parameters*/

#define PSF_DOUBLETOT   ((PSF_NA+1)*PSF_NPSFMAX)/* Nb of fitted parameters */

#define PC_NITER        1       /* Maximum number of iterations in PC fit */

/* NOTES:

One must have:  PSF_MAXSHIFT > 0.0

                PSF_NPSF >= 1

                PSF_NITER >= 1

*/

/*--------------------------- structure definitions -------------------------*/

typedef struct code

  {

  float         *pc;

  float         **param;

  int           *parammod;

  int           ncode;

  int           nparam;

  }             codestruct;

typedef struct pc

  {

  char          name[MAXCHAR];  /* PC filename */

  int           npc;            /* Number of Principal Components */

  int           maskdim;        /* Dimensionality of the tabulated data */

  int           *masksize;      /* PC mask dimensions */

  int           masknpix;       /* Total number of involved PC pixels */

  float         *maskcomp;      /* Convolved pix data (principal components) */

  int           omaskdim;       /* Dimensionality of the tabulated data */

  int           *omasksize;     /* PC mask dimensions */

  int           omasknpix;      /* Total number of involved PC pixels */

  float         *omaskcomp;     /* Original pix data (principal components) */

  float         *maskcurr;      /* Current model */

  float         *mx2,*my2,*mxy; /* 2nd order moments for each component */

  float         *flux;          /* Flux of each component */

  float         *bt;            /* B/T for each component */

  codestruct    *code;

  }     pcstruct;

typedef struct psf

  {

  char          name[MAXCHAR];  /* Name of the file containing the PSF data */

  int           maskdim;        /* Dimensionality of the tabulated data */

  int           *masksize;      /* PSF mask dimensions */

  int           masknpix;       /* Total number of involved PSF pixels */

  float         *maskcomp;      /* Complete pix. data (PSF components) */

  float         *maskloc;       /* Local PSF */

  double        **context;      /* Contexts */

  t_type        *contexttyp;    /* Context types */

  char          **contextname;  /* Array of context key-names */

  double        *contextoffset; /* Offset to apply to context data */

  double        *contextscale;  /* Scaling to apply to context data */

  struct poly   *poly;          /* Polynom describing the PSF variations */

  pcstruct      *pc;            /* PC components */

  double        fwhm;           /* Typical PSF FWHM */

  float         pixstep;        /* PSF sampling step */

  }     psfstruct;

typedef struct

  {

  int           niter;          /* Number of iterations required */

  int           npsf;           /* Number of fitted stars for this detection */

  double        *x,*y;          /* Position derived from the PSF-fitting */

  float         *flux;          /* Flux derived from the PSF-fitting */

  float         *fluxerr;       /* Flux error estimated from the PSF-fitting */

  }     psfitstruct;

/*----------------------------- Global variables ----------------------------*/

psfstruct       *psf,*ppsf,*thepsf;

psfitstruct     *thepsfit,*ppsfit,*psfit;

PIXTYPE         *checkmask;

/*-------------------------------- functions --------------------------------*/

extern void     compute_pos(int *pnpsf,int *pconvflag,int *pnpsfflag,

                        double radmin2, double radmax2,double r2, double *sol,

                        double *flux , double *deltax,double *deltay,

                        double *pdx,double *pdy),

                compute_pos_phot(int *pnpsf,double *sol,double *flux),

                compute_poserr(int j,double *var,double *sol,obj2struct *obj2,

                        double *x2, double *y2,double *xy, int npsf),

                psf_build(psfstruct *psf),

                psf_end(psfstruct *psf, psfitstruct *psfit),

                psf_init(psfstruct *psf),

                svdfit(double *a, float *b, int m, int n, double *sol,

                        double *vmat, double *wmat),

                svdvar(double *vmat, double *wmat, int n, double *covmat);

extern double   *compute_gradient (float *weight,int width, int height,

                        float *masks, float *maskx, float *masky,

                        double *mat),

                *compute_gradient_phot(float *weight,int width, int height,

                        float *masks, double *pm);

extern psfstruct        *psf_load(char *filename);

extern void     pc_end(pcstruct *pc),

                pc_fit(psfstruct *psf, float *data, float *weight,

                int width, int height, int ix, int iy, float dx, float dy,

                int npc, float backrms),

                double_psf_fit(psfstruct *psf, picstruct *field,

                        picstruct *wfield, objstruct *obj,

                        psfstruct *dpsf, picstruct *dfield, picstruct *dwfield),

                psf_fit(psfstruct *psf, picstruct *field, picstruct *wfield,

                objstruct *obj),

                psf_readcontext(psfstruct *psf, picstruct *field);

extern pcstruct *pc_load(catstruct *cat);