Bonjour, je n'arrive pas à retrouver le message original avec mon décodeur.
voici le code:

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#include <cv.h>   	// open cv general include file
#include <highgui.h>	// open cv GUI include file
#include <iostream>
#include <fstream>
#include <cstring>
#include <sstream>
#include <stdlib.h>
 
 
 
using namespace cv; // OpenCV API is in the C++ "cv" namespace
using namespace std;
unsigned long
    djb2(unsigned char *str)
    {
        unsigned long hash = 5381;
        int c;
 
        while (c = *str++)
            hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
 
        return hash;
    }
int main(int argc, char** argv )
{
 
 
	Mat encodedImg;  // inputobject
	Mat originalImg;	 //original object
   	Mat outputImg(Size(640,480),CV_8U);
	Mat invertedImg;
	Mat noisecarrierImg;
	std::vector<int>params;
	// check that command line arguments are provided and image reads in OK
 
  if(argc != 4)
	  cout<<"invalid argument"<<endl;
 
 
	//prompt the user for a character string password
	string password;
	cout <<"Set the password:"<<endl;
	cin >> password;
 
	//hash function: transform an ascii to a 64bit integer
 
	unsigned long b=djb2((unsigned char *)password.c_str());
 
 
	//random nunmber generator seed
	RNG random(b);
 
 
 
 
	//generate an  array structure of boolean
	if((encodedImg=imread(argv[1], CV_LOAD_IMAGE_COLOR)).empty())
	{
		cout<<"impossible to load file"<<endl;
		return 0;
	}
	originalImg=imread(argv[2],CV_LOAD_IMAGE_COLOR);
 
	bool* list=new bool [3*encodedImg.rows*encodedImg.cols];
 
	for(int a=0; a<encodedImg.rows*encodedImg.cols*3; a++)
	  {
 
			  list[a] = false;
 
	  }
	//generate noise carrier image
		noisecarrierImg=encodedImg.clone();
	for (int k=0; k<3; k++)
	{
		for(int i=0; i<encodedImg.rows; i++)
	  {
		  for(int j=0; j<encodedImg.cols; j++) 
		  {
	noisecarrierImg.at<Vec3b>(i,j)=originalImg.at<Vec3b>(i,j)[k]+random.gaussian(15.0);
		  }
		}
	}
	//select a random location in the colored carrier image
for(int i=0; i<encodedImg.rows; i++)
	  {
		  for(int j=0; j<encodedImg.cols; j++) 
		  {
 
 
 
	int r;
	int c;
	int g;
 
	 do
	{
	c=random(encodedImg.cols);
	r=random(encodedImg.rows);
	g=random(3);
	 }
	while(list[(r*encodedImg.cols + c)*3 + g] &&  encodedImg.at<Vec3b>(r,c)[g] == 255 );
	list[(r*encodedImg.cols + c)*3 + g]=true;
 
 
 
 
      outputImg.at<uchar>(i,j)=(encodedImg.at<Vec3b>(r,c)[g] -noisecarrierImg.at<Vec3b>(r,c)[g])*255);
 
		  }
	}
 
	 invertedImg=outputImg.clone();
	 for(int i=0; i<outputImg.rows; i++)
	  {
		  for(int j=0; j<outputImg.cols; j++)
		  {
 
		if(outputImg.at<uchar>(i,j)==0)
		  outputImg.at<uchar>(i,j)=255;
		  if(outputImg.at<uchar>(i,j)==1)
		  outputImg.at<uchar>(i,j)=0;
		  }
	 }
 
 
 
 
	imwrite(argv[3], invertedImg, params);
 
}