Glare measuring system

A glare measuring system comprising:

• a camera that is supported to be rotatable within a flat plane;
• and
• a computer that calculates an equivalent veiling luminance based on a luminance distribution of an image picked up by the camera and calculates a value of glare based on the equivalent veiling luminance and an average luminance of the captured image, wherein
• the camera has a lens mounted thereon and picks up the image through the lens in a position that is rotated within the flat plane at intervals of an angle corresponding to an angle of view of the lens, thereby imaging all directions within the flat plane,
• a glare measurement direction and a glare imaging range are set within the flat plane the glare measurement direction being at a center of the glare imaging range and being different from a center of the angle of view,
• each of the pickup images is imaged through the lens, and
• the computer converts each of the pickup images that cover the glare imaging range into a converted image in which an imaging direction is the glare measurement direction, and combines the converted images to generate a combined image in which the glare measurement direction is at a center of the combined image, calculates the equivalent veiling luminance based on the luminance distribution of the combined image and calculates the value of glare in the glare measurement direction based on the equivalent veiling luminance and an average luminance of the combined image.