initUndistortRectifyMap

initUndistortRectifyMap is a function in the OpenCV library, which is widely used for computer vision tasks. This function is designed to compute the undistortion and rectification transformation maps for an image. It takes several parameters, including the camera matrix, distortion coefficients, and optional parameters for rectification. The camera matrix is a 3x3 matrix that contains the intrinsic parameters of the camera, such as the focal length and the principal point. The distortion coefficients are a vector that describes the lens distortion of the camera. The optional parameters for rectification include the rotation matrix and the new camera matrix, which are used to transform the image to a new coordinate system. The function returns two maps, one for the x-coordinates and one for the y-coordinates, which can be used to undistort and rectify an image using the remap function. This function is useful for correcting the distortion and aligning the image with a reference coordinate system, which is important for tasks such as stereo vision and 3D reconstruction.