#ifndef _IMAGE_
#define _IMAGE_
#include "global.h"
/*---------------------------------------------------------------------------*/
// Basic image class
// Improvements that would be useful:
// It would be nice if one could load and save in formats other
// than raw byte format
class Image {
public:
// Create a blank image with width=hsize, height=vsize
// If hsize is unspecified, creates an image of width=0, height=0
// If vsize is unspecified, creates a square image of width=height=hsize
Image (int hsize = -1, int vsize = -1);
// Copy constructor
Image (const Image& image);
// Loads an image of size hsize by vsize from the specified file
// The file is assumed to contain an image in raw byte format
Image (const char *filename, int hsize, int vsize = -1);
// Loads an image of size hsize by vsize from the specified file
// The file is assumed to contain an image in PGM format
Image (const char *filename);
// Destructor
~Image ();
// Assignment operator
Image& operator= (const Image &image);
// Alternative means of addressing pixels
Real& operator() (int i) { return value[i]; }
// Second method of addressing pixels
Real& operator() (int x, int y) { return value[y*hsize+x]; }
// Loads an image from the specified file. The file is assumed to
// contain an image in raw byte format of size hsize by vsize
void loadRaw (const char *filename);
// Saves an image to the specified file. The image is written in
// raw byte format.
void saveRaw (const char *filename);
// Load an image from a PGM file.
void loadPGM (const char *filename);
// Save an image to a PGM file.
void savePGM (const char *filename);
// Compares one image to another and returns the PSNR
Real compare_psnr (const Image *im2);
// Compares one image to another and returns the mean squared error
Real compare_mse (const Image *im2);
// Resize an image -- crop original image or pad with 0's to make fit
// new boundaries
void resize (int new_hsize, int new_vsize);
unsigned char realToChar (Real x)
{ return (x>255?255:(x
Real *value;
int hsize, vsize;
unsigned long num_of_pixels;
protected:
void PGMSkipComments (FILE* infile, unsigned char* ch);
//橡铒篑赅弪 玎泐腩忸
