Patent ID: 11906439
Assignee: TOSHIBA DIGITAL SOLUTIONS CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical inspection method comprising:
emitting a light beam having a first wavelength and a light beam having a second wavelength different from the first wavelength in a single direction toward an imaging unit in accordance with light beam directions from a subject, with a light beam intensity of the first wavelength and a light beam intensity of the second wavelength being in a complementary relationship, and acquiring image data including information of a first image related to the light beam having the first wavelength and information of a second image related to the light beam having the second wavelength with the imaging unit; and
comparing the information of the first image and the information of the second image to extract unevenness information of the subject,
wherein the complementary relationship is a relationship in a certain pixel of the imaging unit, in which:
when the light beam intensity of the first wavelength is increased, the light beam intensity of the second wavelength is weakened in the same certain pixel, or
when the light beam intensity of the second wavelength is increased, the light beam intensity of the first wavelength is weakened in the same certain pixel.