LIGHT DISTRIBUTION CONTROLLING DEVICE, VEHICLE LAMP SYSTEM, AND LIGHT DISTRIBUTION CONTROLLING METHOD

A light distribution controlling device generates a processed image by adding a pixel line of a luminance value higher than a predetermined threshold to an end, in a width direction of a vehicle, of an image that is based on a first imaging device; extracts, from the processed image, a processing region that includes a front vehicle; generates an extracted image by subjecting the processing region to an extracting process of extracting a high-luminance pixel with use of the threshold; and sets a shaded portion to overlap the front vehicle based on a pair of high-luminance pixels included in the extracted image and determines a light distribution pattern that includes the shaded portion.