Patent ID: 8419632

Claim:
A body-insertable apparatus to be inserted into a subject, the body-insertable apparatus comprising: an illumination unit that illuminates an inside of the subject; an imaging device comprising: an effective pixel region on which an optical image of the inside of the subject illuminated by the illumination unit is formed; and an optical black region at which the optical image is shielded, wherein the effective pixel region has a predetermined size; and a light adjustment control unit that adjusts an amount of light from the illumination unit to the effective pixel region based on pixel values of the effective pixel region of an image signal and pixel values of the optical black region of the image signal, wherein the light adjustment control unit comprises: a measured light value calculating unit that calculates a measured light value from the effective pixel region of the image signal; a target value storage unit that stores a target value for adjusting the amount of light emitted by the illumination unit; a black level detecting unit that acquires a black level index of a black level of the image signal based on one or more pixel values contained in the optical black region; and a light adjustment computing unit that adjusts the amount of light from the illumination unit based on the measured light value calculated by the measured light value calculating unit, the target value stored in the target value storage unit, and the black level index acquired by the black level detecting unit.