Bonjour,

Je ne comprends pas pourquoi mon code ne modifie pas le vecteur encoded_message_pixels ? J'ai mis des commentaires en rouge dans le code ci-dessous pour que vous localisié le problème.

merci de m'aider au plus vite !!! avant que je détruise mon ordi

Code : Sélectionner tout - Visualiser dans une fenêtre à part
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
#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;
}
Merci d'avance.