int Parity_check(Image **I, int algo_tab[], int i, int j);
void Parity_encode(Image **I, unsigned char *msg);
void Parity_decode(Image **I, unsigned char *msg);
void Change_LSB(unsigned char *x);
void GetOneChar(unsigned char x, unsigned char *a, int i);
void bit_in_tab(unsigned char *byte, int tab[]);
uint8_t Get_msg_size(Image **I);