Patent Document ID: 10007836
Application ID: 14780974
Patent Status: 1

Claim One:
1. A bird detection device in combination with a photographic device, the combination comprising: a captured image input operatively connected to the photographic device and that receives a captured image from the photographic device, wherein the photographic device comprises an image capturing unit and a drive unit, the drive unit connected to the image capturing unit to drive the image capturing unit to swivel at a constant speed over an image capturing area covered by the image capturing unit; a bird candidate image extraction unit configured to extract a bird candidate image from the captured image, the bird candidate image being a candidate for a bird image, the bird candidate image extraction unit including a difference extraction unit operatively connected to the captured image input, the difference extraction unit i) detecting a movement of an object in captured images received at the captured image input by calculating an amount of shift in an image caused by the swiveling of the image capturing unit, ii) correcting the captured images by the calculated amount of shift, and iii) extracting a difference between the corrected images; and a bird detection determination unit operatively connected to the bird candidate image extraction unit to receive the bird candidate image, and from the bird candidate image determine whether a bird has been detected, based on a time required for the bird candidate image to move in accordance with a size of the bird candidate image in the captured image, wherein the bird detection determination unit determines whether a bird has been detected, based on a degree of change in a shape of the bird candidate image per predetermined time.