1 |
greg |
2.2 |
/* RCSid $Id: interp2d.h,v 2.1 2013/02/09 00:55:40 greg Exp $ */ |
2 |
greg |
2.1 |
/* |
3 |
|
|
* Header for interpolation of anisotropic values on 2-D plane. |
4 |
|
|
* |
5 |
|
|
* G.Ward Feb 2013 |
6 |
|
|
*/ |
7 |
|
|
|
8 |
|
|
#define NI2DSMF 0.42f /* minimal smoothing radius */ |
9 |
|
|
|
10 |
|
|
#define NI2DIR (2*4) /* # interpolation directions */ |
11 |
|
|
|
12 |
|
|
/* Data structure for interpolant */ |
13 |
|
|
typedef struct { |
14 |
|
|
int ns; /* number of sample positions */ |
15 |
|
|
float rmin; /* minimum valid radius (default=.5) */ |
16 |
|
|
float smf; /* smoothing factor (def=NI2DSMF) */ |
17 |
|
|
unsigned short (*ra)[NI2DIR]; /* anisotropic radii (private) */ |
18 |
|
|
float spt[1][2]; /* sample positions (extends struct) */ |
19 |
|
|
} INTERP2; |
20 |
|
|
|
21 |
|
|
/* Allocate a new set of interpolation samples (caller assigns spt[] array) */ |
22 |
|
|
extern INTERP2 *interp2_alloc(int nsamps); |
23 |
|
|
|
24 |
greg |
2.2 |
/* Resize interpolation array (caller must assign any new values) */ |
25 |
|
|
extern INTERP2 *interp2_realloc(INTERP2 *ip, int nsamps); |
26 |
|
|
|
27 |
greg |
2.1 |
/* Assign full set of normalized weights to interpolate the given location */ |
28 |
|
|
extern int interp2_weights(float wtv[], INTERP2 *ip, double x, double y); |
29 |
|
|
|
30 |
|
|
/* Get normalized weights and indexes for n best samples in descending order */ |
31 |
|
|
extern int interp2_topsamp(float wt[], int si[], const int n, |
32 |
|
|
INTERP2 *ip, double x, double y); |
33 |
|
|
/* Free interpolant */ |
34 |
|
|
extern void interp2_free(INTERP2 *ip); |
35 |
greg |
2.2 |
|
36 |
|
|
/* (Re)compute anisotropic basis function interpolant (normally automatic) */ |
37 |
|
|
extern int interp2_analyze(INTERP2 *ip); |