US Patent 9779313 Vehicle vision system with trailer angle detection

A vehicular vision system includes a camera and an image processor operable to process captured image data. When the vehicle is towing a trailer, and based at least in part on image processing of image data captured by the camera during maneuvering of the vehicle and the trailer, the vision system estimates a length of the trailer. Image data captured during maneuvering of the vehicle and the trailer includes image data captured when the vehicle is maneuvered with the trailer at an angle relative to the vehicle. The vision system, responsive at least in part to image processing of captured image data, determines a trailer angle of the trailer that is towed by the vehicle, and is operable to determine a path of the trailer responsive to a steering angle of the vehicle and the determined trailer angle of the trailer and the estimated length of the trailer.