# US 11,122,246 B2 · Multiple observer improvement for a virtual environment

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- Number: US 11,122,246 B2
- Document ID: US11122246B2
- Status: Granted
- Kind: B2
- Application number: 16/632,148
- Filed: 2018-07-18
- Published: 2020-05-28
- Granted: 2021-09-14
- Earliest claimed: 2017-07-19
- Assignees: Euclideon Holographics Pty Ltd
- Applicants: Euclideon Holographics Pty Ltd
- Inventors: Bruce Robert Dell
- Web page: https://patentgrep.com/patent/US11122246B2

## CPC

- G02B 27/017: {Head mounted}
- G02B 30/22: of the stereoscopic type
- G02B 30/24: involving temporal multiplexing, e.g. using sequentially activated left and right shutters
- G06F 3/012: {Head tracking input arrangements}
- G06F 3/04815: Interaction with a metaphor-based environment or interaction object displayed as three-dimensional [3D], e.g. changing the user viewpoint with respect to the environment or object
- H04N 9/3147: {Multi-projection systems (video walls G06F3/1446)}
- H04N 9/3194: {including sensor feedback}
- H04N 13/117: the virtual viewpoint locations being selected by the viewers or determined by viewer tracking
- H04N 13/334: using spectral multiplexing
- H04N 13/337: using polarisation multiplexing
- H04N 13/363: using image projection screens (volumetric display H04N13/388)
- H04N 13/368: for two or more viewers
- G02B 2027/0114: {comprising dichroic elements}
- G02B 2027/0134: {of stereoscopic type}
- G02B 2027/0178: {Eyeglass type (eyeglass details G02C)}
- G02B 2027/0187: {slaved to motion of at least a part of the body of the user, e.g. head, eye}
- G03B 21/00: Projectors or projection-type viewers; Accessories therefor (devices for changing pictures G03B23/00)
- G06F 3/1423: {controlling a plurality of local displays, e.g. CRT and flat panel display}
- G09G 2354/00: Aspects of interface with display user
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- 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)
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A virtual reality imaging system for two or more users including: at least one screen for presenting images of a virtual environment to two or more users; an imaging assembly, including two or more sets of projectors corresponding to the two or more users for producing images on the at least one screen; a tracking system that is configured to track each of the two or more users; a computer that is programmed to produce stereo 3D images of the virtual environment corresponding to tracking data from the tracking system for phone providing different views of the same virtual environment; stereo 3D glasses arranged to provide stereo 3D images; and an image separation arrangement whereby each user sees images emanating from a corresponding one of the sets of projectors only.

## Claims

### Claim 1

A virtual reality imaging system for two or more users, the imaging system comprising:
at least one screen that presents images of a virtual environment to two or more users;
an imaging assembly, including two or more sets of projectors corresponding to the two or more users, that produces images on the at least one screen;
a tracking system that tracks each of the two or more users;
a computer that is programmed to respond to the tracking system and control the imaging assembly to produce stereo 3D images of the virtual environment corresponding to tracking data from the tracking system for each of the two or more users for each user to perceive different views of the same virtual environment appropriate to their position;
stereo 3D glasses configured to be worn by each of the two or more users in order for the users to perceive the stereo 3D images; and
an image separation system that presents images from the two or more sets of projectors to corresponding ones of the two or more users such that each user sees images emanating from a corresponding one of said sets of projectors only.

### Claim 2 (depends on 1)

The imaging system of claim 1, wherein the image separation system includes two or more filters for separating images from the two or more sets of projectors wherein the different viewing filters have different visible light spectral transmission characteristics.

### Claim 3 (depends on 2)

The imaging system of claim 2, wherein the filters comprise interference filters.

### Claim 4 (depends on 3)

The imaging system of claim 3, wherein the filters comprise films of dichroic material.

### Claim 5 (depends on 3)

The imaging system of claim 3, wherein the filters of the image separation system comprise corresponding viewer and projector interference filters,
wherein a viewer interference filter is mounted to the stereo 3D glasses for the user and projector interference filters are mounted to projectors of the corresponding set of projectors.

### Claim 6 (depends on 1)

The imaging system of claim 1, wherein the stereo 3D glasses comprise first and second visible light filter windows and the image separation system comprises a polarization filter.

### Claim 7 (depends on 1)

The imaging system of claim 1, wherein the stereo 3D glasses comprise first and second visible light filter windows and the image separation system comprises an active shutter filter.

### Claim 8 (depends on 1)

The imaging system of claim 1, further comprising a table wherein the least one screen comprises a translucent tabletop of the table.

### Claim 9 (depends on 8)

The imaging system of claim 8, wherein said projectors are arranged below the screen for projecting on an underside thereof.

### Claim 10 (depends on 8)

The imaging system of claim 8, wherein the table is rectangular and has four corners,
wherein the tracking system comprises four sensors that are located respectively at the four corners of the table.