split_image.c
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	/***************************************************************/
	/* */
	/* FUNCTION: split_image */
	/* */
	/* PURPOSE: splits an image */
	/* */
	/* INPUT: image image to split */
	/* nbr_lin number of lines of image */
	/* nbr_col number of colums of image */
	/* */
	/* RETURN: 0 if everything is OK */
	/* -1 if memory allocation failure */
	/* */
	/* VERSION: December 1992 */
	/* */
	/* AUTHOR: Karim BOUYOUCEF */
	/* */
	/***************************************************************/
	#include <stdio.h>
	#include "fonction.h"
	#include "lt.h"

	int split_image(double **image, int nbr_lin, int nbr_col)
	{
	/************** declarations **********************************/
	auto int i, j;
	auto double tmp;

	/********* split of image ******************/
	for (i = 0; i < nbr_lin / 2; i++)
	for (j = 0; j < nbr_col / 2; j++)
	{
	tmp = image[i+nbr_lin/2][j+nbr_col/2];
	image[i+nbr_lin/2][j+nbr_col/2] = image[i][j];
	image[i][j] = tmp;

	tmp = image[i][j+nbr_col/2];
	image[i][j+nbr_col/2] = image[i+nbr_lin/2][j];
	image[i+nbr_lin/2][j] = tmp;
	}

	return(0);
	}