LIGHT DISTRIBUTION CHARACTERISTIC MEASUREMENT APPARATUS AND LIGHT DISTRIBUTION CHARACTERISTIC MEASUREMENT METHOD

摘要

In connection with a light distribution characteristic measurement apparatus for measuring light distribution characteristics by imaging a light source by an imaging unit, and a light distribution characteristic measurement method appropriate for the same, a dark portion is more accurately measured and evaluated. The light distribution characteristic measurement device includes: a processing means; an imaging unit that is arranged to be spaced apart from a light source by a predetermined distance; a prevention member for preventing light from the light source from entering a telescreen of the imaging unit; and a movement mechanism for consecutively changing a location relationship of the imaging unit to the light source while a difference between the light source and the imaging unit is maintained. The processing means calculates an amount of calibration from a pixel value of a region of image data imaged by the imaging unit, which corresponds to the prevention member, and calculates light distribution characteristics of the light source on the basis of a relative location of the imaging unit to the light source and calibrated image data obtained by calibrating the image data by the calculated amount of calibration.