CREER,LIRE,ECRIRE ET SEUILLER UNE IMAGE RAW(ALLOCATION DYNAMIQUE ...)

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

unsigned char ** allocation(int NBL, int NBC)
{
	int i, j;
	unsigned char **image;

	image = (unsigned char**)calloc(NBL,sizeof(unsigned char **));
	if (image == NULL)
		return(NULL);

	for (i=0;i<NBL;i++)
	{
		image[i] = (unsigned char*)calloc(NBC,sizeof(unsigned char));
		if (image[i] == NULL)
		{
			for (j=0;j<i;j++)
				free(image[j]);

			free(image);
			return(NULL);
		}
	}

	return(image);
}

void desallocation(unsigned char **image, int NBL)
{
	int i;

	if (image == NULL)
		exit(0);

	for (i=0;i<NBL;i++)
		free(image[i]);

	free(image);
}

void LireImageRAW(unsigned char** image, int NBL, int NBC)
{
	char nom_image[256];
	FILE * fic_image;
	int i, j;

	getchar();
	printf("Nom de l'image a ouvrir : \n");
	gets(nom_image);

	fic_image = fopen(nom_image,"rb");

	if (fic_image == NULL)
	{
		printf("Erreur a l'ouverture de l'image ...\n");
		exit(0);
	}
	else
		printf("Image ouverte avec succes ...\n");

	for(i=0;i<NBL;i++)
		for(j=0;j<NBC;j++)
			fread(&image[i][j],1,1,fic_image);

	fclose(fic_image);
}

void EcrireImageRAW(unsigned char** image, int NBL, int NBC)
{
	char nom_image[256];
	FILE * fic_image;
	int i, j;

	getchar();
	printf("Nom de l'image a ecrire : \n");
	gets(nom_image);

	fic_image = fopen(nom_image,"wb");

	if (fic_image == NULL)
	{
		printf("Erreur a la creation de l'image ...\n");
		exit(0);
	}
	else
		printf("Image cree avec succes ...\n");

	for(i=0;i<NBL;i++)
		for(j=0;j<NBC;j++)
			fwrite(&image[i][j],1,1,fic_image);

	fclose(fic_image);
}

void SeuilImageRAW(unsigned char** image, int NBL, int NBC, int seuil)
{
	int i, j;

	for(i=0;i<NBL;i++)
		for(j=0;j<NBC;j++)
		{
			if (image[i][j] < seuil)
				image[i][j] = 0;
			else
				image[i][j] = 255;
		}
}

int main()
{
	unsigned char ** image;
	int NBL, NBC, seuil;

	printf("Nombre de lignes de l'image :\n");
	scanf("%d",&NBL);
	printf("Nombre de colonnes de l'image :\n");
	scanf("%d",&NBC);

	image = allocation(NBL,NBC);

	if (image != NULL)
	{
		LireImageRAW(image,NBL,NBC);

		printf("Seuil a appliquer : \n");
		scanf("%d",&seuil);

		SeuilImageRAW(image,NBL,NBC,seuil);
		EcrireImageRAW(image,NBL,NBC);
		desallocation(image,NBL);
	}
	else
	{
		printf("Erreur lors de l'allocation memoire! Sortie du programme.\n");
		return 1;
	}


	return 0;
}   

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