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Vector[m].at<uchar>(j, i) = (uchar)Sv[i*heigh + j]; Maybe that's right.

I provided code of the function

I save elments of Mat in uchar vector, and then work with them,when realize LSB.

I realize LSB watermarking algorithm. I load JPEG image,split it to 3 channels,transfer it to unsigned char vector, add watermark, transfer back to 3 one-color Mat and then merge them. Is this plan correct?

It's strange, but it doesn't help:(

Help me, please. I have 3 color components. When I merging them(function merge()) and then read matrix to image and save them on disk(function imread()), I get grayscale JPEG image instead of color JPEG image. What should I do to get color image?

This is all code:

string start = "P0ch@t0k";
string finish = "K5k1R9z@";
int allength = start.length() + finish.length() + length;
int* Cypher = new int[allength * 8];//зашифрованный текст в бинарном виде
Cypher = ModVisioner(text, start, finish, length);

string Cyphertext;
for (int i = 0; i < allength; i++)
{
    int Temp[8];
    for (int j = 0; j < 8; j++)
    {
        Temp[j] = Cypher[i * 8 + j];

    }
    Cyphertext.push_back(Binary2Decimal(Temp));

}
cout << Cyphertext << endl;
string Cv;
for (int m = 0; m < 3; m++)
{


    for (int i = 0; i < widt; i++)
    {

        for (int j = 0; j < heigh; j++)
        {
            Cv.push_back(Matvector[m].at<uchar>(j, i));



        }
    }
}

string Sv;//вектор изображения с ЦВЗ
vector<int*>v;
for (int m = 0; m < allength; m++)//текст в двоичной форме
{
    int* b = new int[8];
    for (int i = 0; i < 8; i++)
    {
        b[i] = Cypher[m * 8 + i];
    }
    v.push_back(b);

}

for (int i = 0; i < contsize; i++)
{

    int* P = new int[8];//замена младшего бита
    P = Decimal2Binary((uchar)Cv[i]);
    if ((i % 2 == 0) && (i < allength * 2))
    {
        int k = i / 16;
        int l = (i % 16) / 2;
        P[7] = v[k][l];


    }
    else
    {
        P[7] = rand() % 2;
    }
    Sv.push_back(Binary2Decimal(P));
}
Mat Vector1(heigh, widt, CV_8UC1);
Mat Vector2(heigh, widt, CV_8UC1);
Mat Vector3(heigh, widt, CV_8UC1);
vector<Mat> Vector;
Vector.push_back(Vector1);
Vector.push_back(Vector2);
Vector.push_back(Vector3);
for (int m = 0; m < 3; m++)
{
    for (int i = 0; i < widt; i++)
    {

        for (int j = 0; j < heigh; j++)
        {
            Vector[m].at<uchar>(j, i) = Sv[i*heigh + j];



        }
    }


}

Mat FResult(heigh, widt, CV_8UC3);
merge(Vector, FResult);
imwrite("merged.jpg", FResult);
namedWindow("Display window", WINDOW_AUTOSIZE);
imshow("Display window", FResult);
waitKey(0);
destroyWindow("DisplayWindow");

This is code:

 int l = label1->Text->Length;
                 int* codes = new int[l];
                 for (int i = 0; i <l; i++)
                 {
                     int a = label1->Text[i];
                     codes[i] = label1->Text[i];
                 }
                 System::String^ start = "p0ChAT0K";
                 System::String^ finish = "J93K@dfa";
                 System::String^ Result = label1->Text;
                 length = start->Length + finish->Length + Result->Length;
                 bool* Cypher = new bool[length * 8];//зашифрованный текст в бинарном виде
                 if (radioButton2->Checked)
                 {
                     Cypher = ModVisioner(codes, start, finish, l);
                 }
                 int textsize = length * 8;
                 int contsize = 3 * widt*heigh;
                 if (textsize * 2<contsize)//внедрение в каждый второй младший бит
                 {
                     label2->Text = "Good Image";
                 }
                 else
                 {
                     label2->Text = "Bad Image";
                 }

                 vector<int>Cv;
                 for (int m = 0; m < 3; m++)
                 {


                     for (int i = 0; i < widt; i++)
                     {

                         for (int j = 0; j < heigh; j++)
                         {
                             uchar temp1 = Matvector[2 - m].at<uchar>(j, i);
                             Cv.push_back(temp1);


                         }
                     }
                 }

                 vector<int>Sv;//вектор изображения с ЦВЗ
                 vector< bool*>v;
                 for (int m = 0; m < length; m++)//текст в двоичной форме
                 {
                     bool* b = new bool[8];
                     for (int i = 0; i<8; i++)
                     {
                         b[i] = Cypher[m * 8 + i];
                     }
                     v.push_back(b);
                     delete b;
                 }


                 for (int i = 0; i < contsize; i++)
                 {

                     bool* P = new bool[8];//замена младшего бита
                     P = Decimal2Binary(Cv[i]);
                     if ((i % 2 == 0) && (i<length * 2))
                     {
                         int k = i / 16;
                         int l = (i % 16) / 2;
                         P[7] = v[k][l];


                     }
                     else
                     {
                         P[7] = rand() % 2;
                     }
                     Sv.push_back(Binary2Decimal(P));
                     delete P;
                 }


                 Mat Vector1 = cvCreateMat(heigh, widt, CV_8UC1);
                 Mat Vector2 = cvCreateMat(heigh, widt, CV_8UC1);
                 Mat Vector3 = cvCreateMat(heigh, widt, CV_8UC1);
                 vector<Mat> Vector;
                 Vector.push_back(Vector1);
                 Vector.push_back(Vector2);
                 Vector.push_back(Vector3);
                 for (int m = 0; m < 3; m++)
                 {
                     for (int i = 0; i < widt; i++)
                     {

                         for (int j = 0; j < heigh; j++)
                         {
                             Vector[2 - m].at<uchar>(j, i) = Sv[i*heigh + j];



                         }
                     }

                 }

                 Mat FResult = cvCreateMat(heigh, widt, CV_8UC1);
                 merge(Vector, FResult);//error here
                 imwrite("merged.jpg", FResult);
                 return FResult;

It is a code of steganoalgorithm LSB in OpenCV. before merging channels it works well. Please,help me and tell me why this exception is happens.