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Here's a method I'm using to copy data from a 'cv::Mat' to a 'System::Drawing::Bitmap'. If I remember right, it is inspired by EmguCV's way to deal with this problem, but I'm not sure. I just slightly edited this code to simplify it, so no guarantee it will work.

System::Drawing::Bitmap^ MatToBitmap(const cv::Mat& img)
{
    if (img.type() != CV_8UC3)
    {
        throw gcnew NotSupportedException("Only images of type CV_8UC3 are supported for conversion to Bitmap");
    }

    //create the bitmap and get the pointer to the data
    PixelFormat fmt(PixelFormat::Format24bppRgb);
    Bitmap ^bmpimg = gcnew Bitmap(img.cols, img.rows, fmt);

    BitmapData ^data = bmpimg->LockBits(System::Drawing::Rectangle(0, 0, img.cols, img.rows), ImageLockMode::WriteOnly, fmt);

    byte *dstData = reinterpret_cast<byte*>(data->Scan0.ToPointer());

    unsigned char *srcData = img.data;

    for (int row = 0; row < data->Height; ++row)
    {
        memcpy(reinterpret_cast<void*>(&dstData[row*data->Stride]), reinterpret_cast<void*>(&srcData[row*img.step]), img.cols*img.channels());
    }

    bmpimg->UnlockBits(data);

    return bmpimg;
}

Here's a method I'm using to copy data from a 'cv::Mat' cv::Mat to a 'System::Drawing::Bitmap'. System::Drawing::Bitmap. If I remember right, it is inspired by EmguCV's way to deal with this problem, but I'm not sure. I just slightly edited this code to simplify it, so no guarantee it will work.

System::Drawing::Bitmap^ MatToBitmap(const cv::Mat& img)
{
    if (img.type() != CV_8UC3)
    {
        throw gcnew NotSupportedException("Only images of type CV_8UC3 are supported for conversion to Bitmap");
    }

    //create the bitmap and get the pointer to the data
    PixelFormat fmt(PixelFormat::Format24bppRgb);
    Bitmap ^bmpimg = gcnew Bitmap(img.cols, img.rows, fmt);

    BitmapData ^data = bmpimg->LockBits(System::Drawing::Rectangle(0, 0, img.cols, img.rows), ImageLockMode::WriteOnly, fmt);

    byte *dstData = reinterpret_cast<byte*>(data->Scan0.ToPointer());

    unsigned char *srcData = img.data;

    for (int row = 0; row < data->Height; ++row)
    {
        memcpy(reinterpret_cast<void*>(&dstData[row*data->Stride]), reinterpret_cast<void*>(&srcData[row*img.step]), img.cols*img.channels());
    }

    bmpimg->UnlockBits(data);

    return bmpimg;
}