Panum's area measurement method, apparatus, and wearable display device

Patent metadata

Field	Value
Publication number	US-11517195-B2
Application number	US-202016809194-A
Country	US
Kind code	B2
Filing date	Mar 4, 2020
Priority date	Sep 4, 2017
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A panum's area measurement method includes: projecting a first parallax image of a spatial object to the left eye of a user under test, and projecting a second parallax image of the spatial object to the right eye of the user under test, the first parallax image comprising a first homologous point and the second parallax image comprising a second homologous point; adjusting a horizontal parallax amount between the first homologous point and the second homologous point until the user under test observes the spatial object producing a ghost; acquiring a parallax amount parameter Δne; calculating a horizontal physical spacing Δx between the first homologous point and the second homologous point based on the parallax amount parameter Δne; and calculating a panum's area range (μin, μout) of the user under test based on the horizontal physical spacing Δx.

First claim

What is claimed is:

1. A panum's area measurement method, comprising:
projecting a first parallax image of a spatial object to the left eye of a user under test, and projecting a second parallax image of a spatial object to the right eye of the user under test, the first parallax image comprising a first homologous point and the second parallax image comprising a second homologous point;
adjusting a horizontal parallax amount between the first homologous point and the second homologous point until the user under test observes the spatial object producing a ghost, acquiring a parallax amount parameter Δn e , and calculating a horizontal physical spacing Δx between the first homologous point and the second homologous point based on the parallax amount parameter Δn e ; and
calculating a panum's area range (μ in , μ out ) of the user under test based on the horizontal physical spacing Δx;
wherein the acquiring a parallax amount parameter Δn e comprises:
adjusting the horizontal parallax amount towards a positive parallax amount, acquiring an in-screen parallax amount parameter Δn ein and determining an in-screen horizontal physical spacing Δx in ; adjusting the horizontal parallax amount towards a negative parallax amount, acquiring an out-screen parallax amount parameter Δn eout , and determining an out-screen horizontal physical spacing Δx out ; and determining the panum's area range (μ in , μ out ) based on the in-screen horizontal physical spacing Δx in and the out-screen horizontal physical spacing Δx out .

2. The method according to claim 1 , further comprising:
statistically measuring panum's area ranges of users under test having the same attribute as the user under test based on attributes of the users under test, and acquiring a panum's region average value of the users under test having the same attribute; and
preparing three-dimensional display content based on the panum's area average value.

3. The method according to claim 1 , wherein the horizontal physical spacing Δx comprises the in-screen physical spacing Δx in and the out-screen horizontal physical spacing Δx out , which are calculated by the following formula:
Δ x=Δn e ξ e ′+E   (7)

wherein E denotes a pupillary distance of the user under test, and ξ e ′ denotes a pixel size of a display screen on an image plane;

ξ
e
′

=

2
⁢

(

S
e
′

+

d
e

)

M
e

⁢

⁢

tan
⁡

(

α
e

2

)

(
5
)

wherein S e ′ denotes an image distance which is generally a human eyes visibility distance of 25 cm, d e denotes a distance from the eyes to a center of a lens, M e denotes a horizontal resolution of an individual display screen in the display screen, and α e denotes a horizontal viewing angle;
wherein a critical value of the panum's area range (μ in , μ out ) is as follows:

{

β
in

=

2
⁢

⁢

arctan
⁡

(

E

2
⁢
H

)

-

μ
in

⁢
π

180

Δ
⁢

⁢

x
in

=

E
-

2
⁢
H
⁢

⁢

tan
⁡

(

β
in

2

Assignees

• Cloudminds Shenzhen Robotics Systems Co Ltd
• Cloudminds Robotics Co Ltd

Inventors

• Cui Huakun
• Wang Kai
• Lian Shiguo

Classifications

• A61B3/005

  Constructional features of the display · CPC title

• G06F3/013

  Eye tracking input arrangements (G06F3/015 takes precedence) · CPC title

• G06T2207/30041

  Eye; Retina; Ophthalmic · CPC title

• A61B5/1114

  Tracking parts of the body · CPC title

• G06T2210/41

  Medical · CPC title