Title:
PUPIL DETECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/251146
Kind Code:
A1
Abstract:
Provided is a pupil detection device capable of easily increasing the pupil detection accuracy irrespective of the state of a subject. A pupil detection device 1 is provided with: a light source 3A having a first central wavelength and provided at an opening 8 of a camera 2; a light source 3B having a second central wavelength and provided outside the light source 3A; and a control device 4. The camera 2 has: an optical element 9 provided with a division element 9A that allows light having the first central wavelength to pass therethrough and and allows transmission of linearly polarized light having a predetermined angle, and a division element 9B that allows light having the second central wavelength to pass therethrough and allows transmission of linearly polarized light having an angle different from the predetermined angle; and an imaging element 6 in which polarizers that allow transmission of linearly polarized light beams having four different angles are attached to respective pixels adjacent to each other. The control device 4 calculates a luminance corresponding to light having the first central wavelength on the basis of the luminances of the adjacent pixels to obtain a bright pupil image, calculates a luminance corresponding to light having the second central wavelength on the basis of the luminances of the adjacent pixels to obtain a dark pupil image, and calculates the position of a pupil image of a subject on the basis of a differential image obtained by comparing the bright pupil image with the dark pupil image.
Inventors:
EBISAWA YOSHINOBU (JP)
Application Number:
PCT/JP2021/020053
Publication Date:
December 16, 2021
Filing Date:
May 26, 2021
Export Citation:
Assignee:
UNIV SHIZUOKA NAT UNIV CORP (JP)
International Classes:
G06T7/00; A61B3/113; G06T1/00; G06T7/70
Domestic Patent References:
| WO2017013913A1 | 2017-01-26 | |||
| WO2017077676A1 | 2017-05-11 |
Foreign References:
| JP2018126492A | 2018-08-16 | |||
| JP2014151025A | 2014-08-25 | |||
| JPH11169345A | 1999-06-29 | |||
| JPH02138673A | 1990-05-28 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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