Patent ID: 9373047
Filing Date: 2016-06-21
CPC Classification: G06K

Claim Text:
1. A biometric authentication device comprising: a camera configured to photograph a biological body and acquire biological body information; a plurality of distance sensors each of which detects a distance to the biological body; and a processor configured to execute a process, the process including determining an accumulation value of difference values between a predetermined number of sets of said posture information at the time of the authentication and reference information, and determining that the posture of said biological body is steady when the accumulation value is less than or equal to a first predetermined value; updating said registered biological body information with the biological body information at the time of the authentication when the posture of said biological body is steady and a difference value between said posture information at the time of registration and said posture information at the time of the authentication is greater than or equal to a second predetermined value; and determining an outside light intensity indicating an intensity of an outside light, based on brightness values of pixels in an image photographed when lighting is off by said camera, wherein the processor determines to update said registered biological body information when further determining that said outside light intensity is normal, and wherein the processor sets, as said outside light intensity, a ratio of pixels having said brightness values that are greater than or equal to a fourth predetermined value with respect to all pixels in said image, and determines that said outside light intensity is normal when said outside light intensity is within a third predetermined value.