Control apparatus for vehicle headlight, vehicle headlight system

A control apparatus for a vehicle headlight in which a light distribution pattern is variable comprising:

• a first sensor configured to detect at least a first position indicating a position of a first light-emitting portion of a forward vehicle;
• a second sensor configured to detect a right end position and a left end position of the forward vehicle as seen from an own vehicle, a first distance indicating a relative distance between the right end position and the own vehicle, and a second distance indicating a relative distance between the left end position and the own vehicle, and
• a controller configured to connect each of the first sensor, the second sensor, and the vehicle headlight, and configured to control the operation of the vehicle headlight;
• wherein, when the difference between the first position and the right end position is equal to or less than a first reference value or when the difference between the first position and the left end position is equal to or less than a second reference value, the controller obtains a second position indicating a position of a second light-emitting portion of the forward vehicle that is not detected by the first sensor on the basis of the first position, the right end position, the left end position, the first distance, and the second distance, sets a light distribution pattern having a dimming range corresponding to the position of the forward vehicle by using the first position and the second position, and generates a control signal corresponding to the light distribution pattern and supplies it to the vehicle headlight.