opencv常用操作

1. Vec3d操作三通道图像像素中每个通道

cv::Mat obj_points(4,4,CV_32FC3);
Vec3d point;
for (int i = 0; i < obj_points.rows; i++)
    {
        for (int j = 0; j < obj_points.cols; j++)
        {
            point = obj_points.at(i, j);
            point[0] = 0;
            point[1] = 1;
            point[2] = 2;
        }
    }