如何在opencv中将矩阵转换为图像

Question

我想将矩阵转换为图像，因为它在标题中称矩阵称为B，所以我可以在for循环中对它进行一些修改 这是我的代码：

 Mat   image1 = imread("C://images//IntImage300915163313.bmp");
 //allocate new image
 int dim1[3] = {1000,1000,3};
 Mat B(3,dim1, CV_64F, Scalar::all(-1));
 for (int j1 = 0; j1 < 800; j1++)
 {
     for (int j2 = 0; j2 < 600; j2++)
     { 
     // compute indeces for corresponding pixels
         jj1 =  round( ((double)phi/stepphi)+700.0);
         jj2 =  round( ((double)theta/steptetha)+500.0);


         B.at<double>(1200-jj1,jj2,0) =  image1.at<double>(j1,j2);
         B.at<double>(1200-jj1,jj2,1) =  image1.at<double>(j1,j2);
         B.at<double>(1200-jj1,jj2,2) =  image1.at<double>(j1,j2);
     }
 }

目前循环停在j1 = 799且j2 = 443因此我认为存在问题导致我影响图像类型为矩阵类型