Patent ID: 11881005
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 6:
7. An image processing method performed by an image processing device, the method comprising:
inputting a first invisible light image of only a background in which a subject is not included and a second invisible light image in which the subject and the background are included;
calculating a difference between a pixel value of each pixel of the second invisible light image and a pixel value of a corresponding pixel of the first invisible light image; and
determining whether the pixel is in a subject region or a background region in accordance with whether the difference is equal to or greater than a predetermined threshold, and extracting the subject region from the second invisible light image, wherein the first and second invisible light images are images captured in an environment in which an invisible light irradiation device is disposed so that invisible light is radiated to the background and the invisible light is not radiated to the subject.