#ifndef HEADER_H
#define HEADER_H

/* Written by Waqas Akram, Justin Romberg, & Charles Gamiz, May 1997 */

#include <stdlib.h>
#include <stdio.h>
#include <math.h>

extern int **IMAGE;
extern double **GRADIENT;
extern double intThresh;
extern double intStd;
extern int *sizeI;
extern int COUNT;


/* structure for a pixel */
struct pixel
{
  int m;
  int n;
  struct pixel *next;
};


/* structure for an entire region */
struct region
{
  int num_pixels;
  int num_edge;
  double mean;
  double std;
  double SumOfSquares;
  double SumOfValues;
  struct pixel * pixel_list;
  struct pixel * edge_list;
  char ** visit;
  char ** member;
  struct region * next;
};


struct pixel * create_pixel(int, int);
struct region * create_region();

int ** ReadStartFile(FILE *, int *);
int ** ReadImageFile(FILE *, int *);
double **ReadGradientFile(FILE *);
void WriteImageFile(char *, int **, int*);

void DumpRegion(struct region *);
void AddPixel(struct region *, struct pixel *);

struct pixel * merge_check(struct region *, int, int, 
		    struct pixel *);
struct region * grow_region(struct pixel *);

int ** create_mask(int **, struct pixel *, int);
int ** create_visit(char **);

#endif