Patent ID: 11869225
Assignee: MAXELL, LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 13:
14. A three-dimensional authentication method in a three-dimensional authentication device including an imaging device that images an authentication target as a subject and an authentication controller that authenticates the authentication target imaged by the imaging device, the method comprising:
modulating, by a modulator including a first pattern, light intensity with the first pattern;
converting, by an image sensor, a light beam after the modulating into imaging data;
performing, to the imaging data, a reconstruction process and acquiring an image, the reconstruction process being reconstructed an image of the subject based on cross-correlation operation between the imaging data and pattern data having a second pattern, repeating the reconstruction process while changing a focus distance, acquiring the focus distance having a highest contrast in a predetermined measurement region as a distance from the imaging device to the subject in the measurement region;
changing, by a space control unit, a spacing between the modulator and the image sensor;
verifying authentication image data against registration image data stored in advance, setting a verified result as an image authentication result, the authentication image data being an image of the acquired authentication target; and
verifying authentication distance data against registration distance data stored in advance, and setting a verified result as a distance authentication result, the authentication distance data being a distance of the acquired authentication target.