Assertion failed (K.size() == Size(3, 3) && (D.empty() || D.total() == 4)) in initUndistortRectifyMap

Question

I have an OpenCV-3.3.1 code that receives fisheye images and the camera_info.

I\'m using the cv::fisheye::undistortImage(input_img, output_img, K, D); functi