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greg |
2.2 |
/* RCSid $Id: interp2d.h,v 2.1 2013/02/09 00:55:40 greg Exp $ */
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greg |
2.1 |
/*
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* Header for interpolation of anisotropic values on 2-D plane.
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*
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* G.Ward Feb 2013
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*/
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#define NI2DSMF 0.42f /* minimal smoothing radius */
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#define NI2DIR (2*4) /* # interpolation directions */
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/* Data structure for interpolant */
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typedef struct {
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int ns; /* number of sample positions */
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float rmin; /* minimum valid radius (default=.5) */
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float smf; /* smoothing factor (def=NI2DSMF) */
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unsigned short (*ra)[NI2DIR]; /* anisotropic radii (private) */
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float spt[1][2]; /* sample positions (extends struct) */
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} INTERP2;
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/* Allocate a new set of interpolation samples (caller assigns spt[] array) */
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extern INTERP2 *interp2_alloc(int nsamps);
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greg |
2.2 |
/* Resize interpolation array (caller must assign any new values) */
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extern INTERP2 *interp2_realloc(INTERP2 *ip, int nsamps);
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greg |
2.1 |
/* Assign full set of normalized weights to interpolate the given location */
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extern int interp2_weights(float wtv[], INTERP2 *ip, double x, double y);
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/* Get normalized weights and indexes for n best samples in descending order */
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extern int interp2_topsamp(float wt[], int si[], const int n,
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INTERP2 *ip, double x, double y);
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/* Free interpolant */
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extern void interp2_free(INTERP2 *ip);
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greg |
2.2 |
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/* (Re)compute anisotropic basis function interpolant (normally automatic) */
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extern int interp2_analyze(INTERP2 *ip);
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