# US 12,192,436 B2 · Interocular distance measurement method and correction method

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- Number: US 12,192,436 B2
- Document ID: US12192436B2
- Status: Granted
- Kind: B2
- Application number: 17/922,076
- Filed: 2021-04-15
- Published: 2023-06-01
- Granted: 2025-01-07
- Earliest claimed: 2020-04-28
- Assignees: KYOCERA Corporation
- Applicants: Kyocera Corporation
- Inventors: Kaoru Kusafuka
- Web page: https://patentgrep.com/patent/US12192436B2

## CPC

- H04N 13/366: using viewer tracking
- G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)}
- G02B 27/0179: {Display position adjusting means not related to the information to be displayed}
- G02B 30/32: characterised by the geometry of the parallax barriers, e.g. staggered barriers, slanted parallax arrays or parallax arrays of varying shape or size
- G03B 35/24: using apertured or refractive resolving means on screens or between screen and eye
- G06T 7/70: Determining position or orientation of objects or cameras (camera calibration G06T7/80)
- H04N 13/31: using parallax barriers
- H04N 13/327: Calibration thereof
- H04N 13/363: using image projection screens (volumetric display H04N13/388)
- H04N 13/371: for tracking viewers with different interocular distances; for tracking rotational head movements around the vertical axis
- G02B 2027/0134: {of stereoscopic type}
- G02B 2027/0181: {Adaptation to the pilot/driver}
- G02B 2027/0187: {slaved to motion of at least a part of the body of the user, e.g. head, eye}
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

An interocular distance measurement method is implementable by a three-dimensional display device including a display, a barrier, a detector, and a controller. The display displays a parallax image. The barrier provides parallax between eyes of a user. The detector detects a position of a face of the user. The method includes displaying an image, detecting a first position, detecting a second position, and calculating an interocular distance. The displaying an image includes displaying an image for interocular distance measurement. The detecting a first position includes detecting a first position of the face of the user in response to an instruction from the user. The detecting a second position includes detecting a second position of the face of the user in response to an instruction from the user. The calculating an interocular distance includes calculating an interocular distance of the user based on the first and the second positions.

## Claims

### Claim 1

An interocular distance measurement method implementable by a three-dimensional display device, the display device including
a display configured to display a parallax image projected toward a first eye and a second eye of a user through an optical system,
a barrier configured to define a traveling direction of image light of the parallax image to provide parallax between the first eye and the second eye,
a detector configured to detect a position of a face of the user, and
a controller,
the interocular distance measurement method comprising:
displaying an image for interocular distance measurement in a viewable section of the display determined based on a reference value of an interocular distance;
detecting a first position of the face of the user in response to an instruction from the user, the instruction being based on an image viewable with the first eye;
detecting a second position of the face of the user in response to an instruction from the user, the instruction being based on an image viewable with the second eye; and
calculating an interocular distance of the user through correction of the reference value based on the first position and the second position.

### Claim 2 (depends on 1)

The interocular distance measurement method according to claim 1, wherein
the displaying includes switching an image displayed in the viewable section alternately between a first image and a second image, and the first image and the second image have a difference between the first image and the second image.

### Claim 3 (depends on 2)

The interocular distance measurement method according to claim 2, wherein
the instruction based on the image viewable with the first eye is provided in response to the difference viewable with the first eye being minimum.

### Claim 4 (depends on 2)

The interocular distance measurement method according to claim 2, wherein
the instruction based on the image viewable with the second eye is provided in response to the difference viewable with the second eye being minimum.

### Claim 5

A correction method implementable by a three-dimensional display device, the display device including
a display configured to display a parallax image projected toward a first eye and a second eye of a user through an optical system,
a barrier configured to define a traveling direction of image light of the parallax image to provide parallax between the first eye and the second eye,
a detector configured to detect a position of a face of the user, and
a controller,
the correction method comprising:
displaying an image for interocular distance measurement in a viewable section of the display determined based on a reference value of an interocular distance;
detecting a first position of the face of the user in response to an instruction from the user, the instruction being based on an image viewable with the first eye;
detecting a second position of the face of the user in response to an instruction from the user, the instruction being based on an image viewable with the second eye;
calculating an interocular distance of the user through correction of the reference value based on the first position and the second position; and
correcting the display based on the interocular distance of the user.

### Claim 6 (depends on 5)

The correction method according to claim 5, wherein
the displaying includes switching an image displayed in the viewable section alternately between a first image and a second image, and the first image and the second image have a difference between the first image and the second image.

### Claim 7 (depends on 6)

The correction method according to claim 6, wherein
the instruction based on the image viewable with the first eye is provided in response to the difference viewable with the first eye being minimum.

### Claim 8 (depends on 6)

The correction method according to claim 6, wherein the instruction based on the image viewable with the second eye is provided in response to the difference viewable with the second eye being minimum.