Operation method of adaptive driving beam headlamp system

An operation method of an adaptive driving beam (ADB) headlamp system installed on a driving vehicle, the ADB headlamp system including a processing unit, a headlamp for producing a high beam pattern, and a camera for capturing a sequence of images, the method comprising steps of:

• as the processing unit receives the sequence of images from the camera, determining, by the processing unit, whether a nearby vehicle is in the sequence of images;
• when it is determined that a nearby vehicle is in the sequence of images, determining, by the processing unit, whether the nearby vehicle is in a first condition moving in a direction opposite to a moving direction of the driving vehicle and approaching the driving vehicle, or is in a second condition moving ahead of the driving vehicle in the moving direction of the driving vehicle;
• calculating, by the processing unit, a set of coordinates (X, Y) of the nearby vehicle in a Cartesian coordinate system defined by the driving vehicle;
• calculating, by the processing unit, a relative velocity of the nearby vehicle relative to the driving vehicle;
• calculating, by the processing unit, a moving area into which the nearby vehicle is projected to move based on at least the set of coordinates and the relative velocity of the nearby vehicle, and based on whether the nearby vehicle is in the first condition or the second condition;
• and
• controlling, by the processing unit, the headlamp to dim a part of the high beam pattern that corresponds with the moving area;
• wherein, in the step of calculating a moving area:
• when it is determined that the nearby vehicle is in the first condition, the moving area is calculated as an area extending from the set of coordinates along a direction substantially toward the driving vehicle;
• and
• when it is determined that the nearby vehicle is in the second condition, the moving area is calculated as an area expanding from the set of coordinates in all directions;
• wherein the step of calculating a moving area is to calculate the moving area further based on a camera calibration parameter that is positively correlated to a distance between the driving vehicle and the nearby vehicle, and a lateral velocity calibration parameter that is related to a lateral component of the relative velocity of the nearby vehicle in an X-axis of the Cartesian coordinate system.