Patent ID: 8752961

Claim:
A fundus photographing apparatus comprising: an imaging unit configured to capture a fundus image of a subject's eye via a photographing optical system; wherein the photographing optical system is configured to: capture a first fundus image of the subject's eye at a first point in time; and capture a second fundus image of the subject's eye at a second point in time different from the first point in time; a matching area determination unit configured to: obtain a position of a first matching area from the first fundus image; and search in a specific area relative to the first matching area to obtain a position of a third matching area from the first fundus image; obtain a position of a second matching area from a second fundus image; search in a specific area relative to the second matching area to obtain a position of a fourth matching area from the second fundus image; a correlation value calculation unit configured to: calculate a first correlation values between the first fundus image and the second fundus image captured by the imaging unit based on the position of the first matching area and the position of the second matching area; calculate a second correlation values between the first fundus image and the second fundus image captured by the imaging unit based on the position of the third matching area and the position of the fourth matching area; and determine a final correlation value based on the first correlation value and the second correlation value; and an image generation unit configured to add the first fundus image and the second fundus image based on the final correlation value.