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#include <stdlib.h>
#include <stdio.h>
#include <cv.h> // open cv general include file
#include <highgui.h> // open cv GUI include file
#include <iostream> // standard C++ I/O
#include <vector>
using namespace cv; // OpenCV API is in the C++ "cv" namespace
using namespace std;
unsigned long hashe (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 grayscale, encoded_swap, encoded_message, decoded_message; // image object
int key, flag=0, n=0, swap, l=0, k=0;
bool keepProcessing = true;;
vector<int> params; // file saving compression parameters
const string windowName1 = "decoded_message"; // window name
//const string windowName2 = "decoded_message"; // window name
unsigned char * password = new unsigned char[128] ;
vector <Point2i> pl;
cout << "Enter your password.\n";
cin >> password;
if ((argc == 4) && !(grayscale= imread (argv[1], CV_LOAD_IMAGE_GRAYSCALE)).empty() && !(encoded_swap= imread (argv[2], CV_LOAD_IMAGE_GRAYSCALE)).empty() )
{
if ( (grayscale.rows == encoded_swap.rows) && (grayscale.cols == encoded_swap.cols))
{
cout << "The two images are the same size.\n";
int hv = hashe (password);
RNG r(hv);
int row = encoded_swap.rows;
int col = encoded_swap.cols;
int n = row*col;
vector<int> swap_tab;
vector<int> encoded_message_pixels;
Mat encoded_s = encoded_swap.clone();
Mat grays = grayscale.clone();
encoded_message = encoded_s - grays;
decoded_message = encoded_message.clone();
namedWindow(windowName1, 0);
// we initialise the decoded_message
for (int i=0; i<row; i++)
{
for (int j=0; j<col; j++)
{
decoded_message.at<uchar>(i,j) = 0;
}
}
// we get the encoded message
for (int i=0; i<row; i++)
{
for (int j=0; j<col; j++)
{
if(encoded_message.at<uchar>(i,j) == 1)
{
encoded_message.at<uchar>(i,j) = 0;
}
else
{
encoded_message.at<uchar>(i,j) = 255;
}
}
}
// we get the list of swaping
for(int s=0; s<col*row; s++)
{
swap_tab.push_back(r(col*row));
}
// We write out the list of swaping
cout << "The 10 first swaping numbers are:\n";
for(int h=0; h<10; h++)
{
cout << swap_tab[h] << " ";
}
cout << "\n" ;
// we put the encoded message in an array for easier manipulation
for (int i=0; i<row; i++)
{
for (int j=0; j< col; j++)
{
encoded_message_pixels.push_back(encoded_message.at<uchar>(i,j));
}
}
// we write out the 100 first elements of the encoded_message_pixels before swaping back
cout << "The 100 first encoded message pixels before swaping back are:\n";
for (int i=0; i<100; i++)
{
cout << encoded_message_pixels[i] << " ";
}
cout << "\n" ;
// decoding of the message we swap the pixels backward the list! C'EST ICI QUE SA BUGUE: CE CODE NE FAIT STRICTEMENT RIEN, IL NE MODIFIE PAS LE CONTENU DE encoded_message_pixels
for (int h=col*row-1; h=0; h--)
{
int ss;
ss = encoded_message_pixels[swap_tab.at(h)];
encoded_message_pixels[swap_tab.at(h)] = encoded_message_pixels[h];
encoded_message_pixels[h] = ss;
}
//we write out the 100 first elements of the encoded_message_pixels after swaping back ET ICI ON OBTIENT LA MEME LISTE, QU'AVANT JE NE COMPRENDS RIEN, SUREMENT UNE ERREUR DANS L'INITIALISATION DU VECTEUR, JE SUIS DEBUTANT...
cout << "The 100 first encoded message pixels after swaping back are:\n";
for (int i=0; i<100; i++)
{
cout << encoded_message_pixels[i] << " ";
}
cout << "\n" ;
// we get the decoded message
for (int i=0; i<row; i++)
{
for (int j=0; j< col; j++)
{
decoded_message.at<uchar>(i,j) = encoded_message_pixels[l++];
}
}
// display the decoded message in window
imshow(windowName1, decoded_message );
//save out decoded message to file decoded_message.png
params.push_back(CV_IMWRITE_PNG_COMPRESSION);
params.push_back(95);
imwrite(argv[3], decoded_message, params);
while (keepProcessing)
{
// start event processing loop (very important, in fact essential for GUI)
key=waitKey(20);
// get any keyboard input given by the user and process it
if (key == 'x')
{
// if user presses "x" then exit
std::cout << "Keyboard exit requested : exiting now - bye!" << std::endl;
keepProcessing = false;
}
}
// all OK : main returns 0
return 0;
}
else
{
return -1;
}
}
// not OK : main returns -1
return -1;
} |
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