Method of automatically adjusting leveling of pixel light headlamp for vehicle

A method of automatically adjusting leveling of a pixel light headlamp for a vehicle, the method automatically adjusting leveling of a headlamp equipped with a digital micromirror device (DMD) optical system, the method comprising:

• a test light emission operation of emitting test light to a target located ahead of the vehicle in a state in which the vehicle is stopped;
• an image information acquisition operation of acquiring a test light image formed on a surface of the target by the test light, as image information, using a camera provided in the vehicle;
• a comparison operation of comparing the acquired image information of the test light image with reference information that is input to a controller;
• and
• a leveling correction operation of, when the image information is different from the reference information, controlling, by the controller, an operation of a leveling actuator until the image information are configured to be identical to the reference information,
• wherein the acquired image information related to an outer circumference of the test light image formed by the test light has a rectangular shape in which an upper side and a lower side that face each other and a left side and a right side that face each other are connected, and
• wherein the image information of the test light image, acquired using the camera when the target is in a base state in which the target stands vertically to a ground surface and then has no slope in a forward and backward direction while the target stands in parallel to the vehicle and then has no slope in a left and right direction, is an image in which two respective facing sides are in parallel to each other and have an identical length,
• wherein the image information compared with the reference information of the controller in the comparison operation includes:
• first information about coordinate values of a single point specified in the image information acquired when the target is the base state;
• second information about a distance from a source center of the headlamp to the test light image on the target which is in the base state;
• third information about a left and right slope of the target which is in the base state;
• and
• fourth information about a forward and backward slope of the target which is in the base state.