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sigset.c
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sigset.c
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#include <string.h>
#include <stdlib.h>
#include <grass/imagery.h>
#include <grass/gis.h>
static int gettag(FILE *, char *);
static int get_nbands(FILE *, struct SigSet *);
static int get_title(FILE *, struct SigSet *);
static int get_class(FILE *, struct SigSet *);
static int get_classnum(FILE *, struct ClassSig *);
static int get_classtype(FILE *, struct ClassSig *);
static int get_classtitle(FILE *, struct ClassSig *);
static int get_subclass(FILE *, struct SigSet *, struct ClassSig *);
static int get_subclass_pi(FILE *, struct SubSig *);
static int get_subclass_means(FILE *, struct SubSig *, int);
static int get_subclass_covar(FILE *, struct SubSig *, int);
static double **alloc_matrix(int rows, int cols)
{
double **m;
int i;
m = (double **)G_calloc(rows, sizeof(double *));
m[0] = (double *)G_calloc(rows * cols, sizeof(double));
for (i = 1; i < rows; i++)
m[i] = m[i - 1] + cols;
return m;
}
int I_SigSetNClasses(struct SigSet *S)
{
int i, count;
for (i = 0, count = 0; i < S->nclasses; i++)
if (S->ClassSig[i].used)
count++;
return count;
}
struct ClassData *I_AllocClassData(struct SigSet *S,
struct ClassSig *C, int npixels)
{
struct ClassData *Data;
Data = &(C->ClassData);
Data->npixels = npixels;
Data->count = 0;
Data->x = alloc_matrix(npixels, S->nbands);
Data->p = alloc_matrix(npixels, C->nsubclasses);
return Data;
}
int I_InitSigSet(struct SigSet *S)
{
S->nbands = 0;
S->nclasses = 0;
S->ClassSig = NULL;
S->title = NULL;
return 0;
}
int I_SigSetNBands(struct SigSet *S, int nbands)
{
S->nbands = nbands;
return 0;
}
struct ClassSig *I_NewClassSig(struct SigSet *S)
{
struct ClassSig *Sp;
if (S->nclasses == 0)
S->ClassSig = (struct ClassSig *)G_malloc(sizeof(struct ClassSig));
else
S->ClassSig = (struct ClassSig *)G_realloc((char *)S->ClassSig,
sizeof(struct ClassSig) *
(S->nclasses + 1));
Sp = &S->ClassSig[S->nclasses++];
Sp->classnum = 0;
Sp->nsubclasses = 0;
Sp->used = 1;
Sp->type = SIGNATURE_TYPE_MIXED;
Sp->title = NULL;
return Sp;
}
struct SubSig *I_NewSubSig(struct SigSet *S, struct ClassSig *C)
{
struct SubSig *Sp;
int i;
if (C->nsubclasses == 0)
C->SubSig = (struct SubSig *)G_malloc(sizeof(struct SubSig));
else
C->SubSig = (struct SubSig *)G_realloc((char *)C->SubSig,
sizeof(struct SubSig) *
(C->nsubclasses + 1));
Sp = &C->SubSig[C->nsubclasses++];
Sp->used = 1;
Sp->R = (double **)G_calloc(S->nbands, sizeof(double *));
Sp->R[0] = (double *)G_calloc(S->nbands * S->nbands, sizeof(double));
for (i = 1; i < S->nbands; i++)
Sp->R[i] = Sp->R[i - 1] + S->nbands;
Sp->Rinv = (double **)G_calloc(S->nbands, sizeof(double *));
Sp->Rinv[0] = (double *)G_calloc(S->nbands * S->nbands, sizeof(double));
for (i = 1; i < S->nbands; i++)
Sp->Rinv[i] = Sp->Rinv[i - 1] + S->nbands;
Sp->means = (double *)G_calloc(S->nbands, sizeof(double));
Sp->N = 0;
Sp->pi = 0;
Sp->cnst = 0;
return Sp;
}
#define eq(a,b) strcmp(a,b)==0
int I_ReadSigSet(FILE * fd, struct SigSet *S)
{
char tag[256];
I_InitSigSet(S);
while (gettag(fd, tag)) {
if (eq(tag, "title:"))
get_title(fd, S);
if (eq(tag, "nbands:"))
get_nbands(fd, S);
if (eq(tag, "class:"))
get_class(fd, S);
}
return 1; /* for now assume success */
}
static int gettag(FILE * fd, char *tag)
{
if (fscanf(fd, "%s", tag) != 1)
return 0;
G_strip(tag);
return 1;
}
static int get_nbands(FILE * fd, struct SigSet *S)
{
fscanf(fd, "%d", &S->nbands);
return 0;
}
static int get_title(FILE * fd, struct SigSet *S)
{
char title[1024];
*title = 0;
fscanf(fd, "%[^\n]", title);
I_SetSigTitle(S, title);
return 0;
}
static int get_class(FILE * fd, struct SigSet *S)
{
char tag[1024];
struct ClassSig *C;
C = I_NewClassSig(S);
while (gettag(fd, tag)) {
if (eq(tag, "endclass:"))
break;
if (eq(tag, "classnum:"))
get_classnum(fd, C);
if (eq(tag, "classtype:"))
get_classtype(fd, C);
if (eq(tag, "classtitle:"))
get_classtitle(fd, C);
if (eq(tag, "subclass:"))
get_subclass(fd, S, C);
}
return 0;
}
static int get_classnum(FILE * fd, struct ClassSig *C)
{
fscanf(fd, "%ld", &C->classnum);
return 0;
}
static int get_classtype(FILE * fd, struct ClassSig *C)
{
fscanf(fd, "%d", &C->type);
return 0;
}
static int get_classtitle(FILE * fd, struct ClassSig *C)
{
char title[1024];
*title = 0;
fscanf(fd, "%[^\n]", title);
I_SetClassTitle(C, title);
return 0;
}
static int get_subclass(FILE * fd, struct SigSet *S, struct ClassSig *C)
{
struct SubSig *Sp;
char tag[1024];
Sp = I_NewSubSig(S, C);
while (gettag(fd, tag)) {
if (eq(tag, "endsubclass:"))
break;
if (eq(tag, "pi:"))
get_subclass_pi(fd, Sp);
if (eq(tag, "means:"))
get_subclass_means(fd, Sp, S->nbands);
if (eq(tag, "covar:"))
get_subclass_covar(fd, Sp, S->nbands);
}
return 0;
}
static int get_subclass_pi(FILE * fd, struct SubSig *Sp)
{
fscanf(fd, "%lf", &Sp->pi);
return 0;
}
static int get_subclass_means(FILE * fd, struct SubSig *Sp, int nbands)
{
int i;
for (i = 0; i < nbands; i++)
fscanf(fd, "%lf", &Sp->means[i]);
return 0;
}
static int get_subclass_covar(FILE * fd, struct SubSig *Sp, int nbands)
{
int i, j;
for (i = 0; i < nbands; i++)
for (j = 0; j < nbands; j++)
fscanf(fd, "%lf", &Sp->R[i][j]);
return 0;
}
int I_SetSigTitle(struct SigSet *S, const char *title)
{
if (title == NULL)
title = "";
if (S->title)
free(S->title);
S->title = G_store(title);
return 0;
}
const char *I_GetSigTitle(const struct SigSet *S)
{
if (S->title)
return S->title;
else
return "";
}
int I_SetClassTitle(struct ClassSig *C, const char *title)
{
if (title == NULL)
title = "";
if (C->title)
free(C->title);
C->title = G_store(title);
return 0;
}
const char *I_GetClassTitle(const struct ClassSig *C)
{
if (C->title)
return C->title;
else
return "";
}
int I_WriteSigSet(FILE * fd, const struct SigSet *S)
{
const struct ClassSig *Cp;
const struct SubSig *Sp;
int i, j, b1, b2;
fprintf(fd, "title: %s\n", I_GetSigTitle(S));
fprintf(fd, "nbands: %d\n", S->nbands);
for (i = 0; i < S->nclasses; i++) {
Cp = &S->ClassSig[i];
if (!Cp->used)
continue;
if (Cp->nsubclasses <= 0)
continue;
fprintf(fd, "class:\n");
fprintf(fd, " classnum: %ld\n", Cp->classnum);
fprintf(fd, " classtitle: %s\n", I_GetClassTitle(Cp));
fprintf(fd, " classtype: %d\n", Cp->type);
for (j = 0; j < Cp->nsubclasses; j++) {
Sp = &Cp->SubSig[j];
fprintf(fd, " subclass:\n");
fprintf(fd, " pi: %g\n", Sp->pi);
fprintf(fd, " means:");
for (b1 = 0; b1 < S->nbands; b1++)
fprintf(fd, " %g", Sp->means[b1]);
fprintf(fd, "\n");
fprintf(fd, " covar:\n");
for (b1 = 0; b1 < S->nbands; b1++) {
fprintf(fd, " ");
for (b2 = 0; b2 < S->nbands; b2++)
fprintf(fd, " %g", Sp->R[b1][b2]);
fprintf(fd, "\n");
}
fprintf(fd, " endsubclass:\n");
}
fprintf(fd, "endclass:\n");
}
return 0;
}