EP-4738074-A1 - SYNCHRONIZATION SYSTEM AND SYNCHRONIZATION METHOD OF COORDINATE SYSTEM

EP4738074A1EP 4738074 A1EP4738074 A1EP 4738074A1EP-4738074-A1

Abstract

A synchronization system and a synchronization method of a coordinate system are provided. The synchronization method includes: communicatively connecting a first head-mounted display to a first mobile device, wherein the first mobile device includes a first light source, and the first mobile device and the first head-mounted display correspond to a first coordinate system; outputting a first light based on a first mode by the first light source; identifying the first mobile device according to the first light by a second head-mounted display, wherein the second head-mounted display corresponds to a second coordinate system; and using the first mobile device as a reference point to synchronize the second coordinate system with the first coordinate system by the second head-mounted display.

Inventors

HSU, YUHUI
HSIEH, CHENG-HAN
Chou, Su-Kang

Assignees

HTC Corporation

Dates

Publication Date: 20260506
Application Date: 20250109

Claims (15)

A synchronization system of a coordinate system, comprising: a first mobile device, comprising a first light source; a first head-mounted display, communicatively connected to the first mobile device, wherein the first mobile device and the first head-mounted display correspond to a first coordinate system; and a second head-mounted display, corresponding to a second coordinate system, wherein the first light source outputs a first light based on a first mode, wherein the second head-mounted display identifies the first mobile device according to the first light, and uses the first mobile device as a reference point to synchronize the second coordinate system with the first coordinate system.
The synchronization system according to claim 1, further comprising: a second mobile device, comprising a second light source, wherein the second light source outputs a second light based on a second mode different from the first mode, wherein the second head-mounted display identifies the first mobile device and the second mobile device according to the first light and the second light respectively to generate an identification result, wherein the second head-mounted display selects the first mobile device from the first mobile device and the second mobile device as the reference point according to the identification result.
The synchronization system according to claim 1, wherein in response to the first light source stopping outputting the first light based on the first mode, the second head-mounted display stops synchronizing the second coordinate system with the first coordinate system.
The synchronization system according to claim 1, wherein the second head-mounted display periodically synchronizes the second coordinate system with the first coordinate system according to the first light.
The synchronization system according to claim 1, wherein the second head-mounted display is communicatively connected to at least one of the first head-mounted display and the first mobile device, and obtains the first coordinate system from the at least one of the first head-mounted display and the first mobile device.
The synchronization system according to claim 1, wherein during a period when the first light source outputs the first light based on the first mode, the second head-mounted display and the first head-mounted display perform content sharing.
The synchronization system according to claim 6, wherein the second head-mounted display and the first head-mounted display perform the content sharing through a cloud server.
The synchronization system according to claim 1, wherein the first light source comprises an infrared light-emitting diode.
A synchronization method of a coordinate system, comprising: communicatively connecting a first head-mounted display to a first mobile device, wherein the first mobile device comprises a first light source, and the first mobile device and the first head-mounted display correspond to a first coordinate system; outputting a first light based on a first mode by the first light source; identifying the first mobile device according to the first light by a second head-mounted display, wherein the second head-mounted display corresponds to a second coordinate system; and using the first mobile device as a reference point to synchronize the second coordinate system with the first coordinate system by the second head-mounted display.
The synchronization method according to claim 9, further comprising: outputting a second light based on a second mode different from the first mode by a second light source of a second mobile device; identifying the first mobile device and the second mobile device according to the first light and the second light respectively to generate an identification result by the second head-mounted display; and selecting the first mobile device from the first mobile device and the second mobile device as the reference point according to the identification result by the second head-mounted display.
The synchronization method according to claim 9, further comprising: in response to the first light source stopping outputting the first light based on the first mode, stopping synchronizing the second coordinate system with the first coordinate system by the second head-mounted display.
The synchronization method according to claim 9, further comprising: periodically synchronizing the second coordinate system with the first coordinate system according to the first light by the second head-mounted display.
The synchronization method according to claim 9, further comprising: communicatively connecting the second head-mounted display to at least one of the first head-mounted display and the first mobile device, and obtaining the first coordinate system from the at least one of the first head-mounted display and the first mobile device.
The synchronization method according to claim 9, further comprising: during a period when the first light source outputs the first light based on the first mode, performing content sharing by the second head-mounted display and the first head-mounted display.
The synchronization method according to claim 14, wherein the second head-mounted display and the first head-mounted display perform the content sharing through a cloud server.

Description

BACKGROUND Technical Field The disclosure relates to an extended reality (XR) technology, and particularly relates to a synchronization system and synchronization method of a coordinate system. Description of Related Art In a traditional XR system, if a plurality of XR devices need to share map information, the XR system needs to establish a reliable communication channel between the XR devices. When the application environment of the XR system lacks reliable communication methods, the XR devices will not be able to share map information. On the other hand, the XR system may be positioned through markers in the field. Taking ArUco markers as an example, different ArUco markers may have different shapes or sizes. Users need to consider ambient light sources to dispose the ArUco markers in the appropriate position. To perform positioning by detecting the ArUco markers, users need to input relevant information about the position of ArUco markers into each XR device in advance. Therefore, the way of performing positioning using the ArUco markers is very inconvenient for users. SUMMARY The disclosure provides a synchronization system and a synchronization method of a coordinate system, which may automatically synchronize a coordinate system of a head-mounted display (HMD). A synchronization system of a coordinate system of the disclosure includes a first mobile device, a first head-mounted display, and a second head-mounted display. The first mobile device includes a first light source. The first head-mounted display is communicatively connected to the first mobile device. The first mobile device and the first head-mounted display correspond to a first coordinate system. The second head-mounted display corresponds to a second coordinate system. The first light source outputs a first light based on a first mode. The second head-mounted display identifies the first mobile device according to the first light, and uses the first mobile device as a reference point to synchronize the second coordinate system with the first coordinate system. In an embodiment of the disclosure, the synchronization system further includes a second mobile device. The second mobile device includes a second light source. The second light source outputs a second light based on a second mode different from the first mode. The second head-mounted display identifies the first mobile device and the second mobile device according to the first light and the second light respectively to generate an identification result. The second head-mounted display selects the first mobile device from the first mobile device and the second mobile device as the reference point according to the identification result. In an embodiment of the disclosure, in response to the first light source stopping outputting the first light based on the first mode, the second head-mounted display stops synchronizing the second coordinate system with the first coordinate system. In an embodiment of the disclosure, the second head-mounted display periodically synchronizes the second coordinate system with the first coordinate system according to the first light. In an embodiment of the disclosure, the second head-mounted display is communicatively connected to at least one of the first head-mounted display and the first mobile device, and obtains the first coordinate system from at least one of the first head-mounted display and the first mobile device. In an embodiment of the disclosure, during a period when the first light source outputs the first light based on the first mode, the second head-mounted display and the first head-mounted display perform content sharing. In an embodiment of the disclosure, the second head-mounted display and the first head-mounted display perform the content sharing through a cloud server. In an embodiment of the disclosure, the first light source includes an infrared light-emitting diode. A synchronization method of a coordinate system of the disclosure includes: communicatively connecting a first head-mounted display to a first mobile device, wherein the first mobile device includes a first light source, and the first mobile device and the first head-mounted display correspond to a first coordinate system; outputting a first light based on a first mode by the first light source; identifying the first mobile device according to the first light by a second head-mounted display, wherein the second head-mounted display corresponds to a second coordinate system; and using the first mobile device as a reference point to synchronize the second coordinate system with the first coordinate system by the second head-mounted display. In an embodiment of the disclosure, the synchronization method further includes: outputting a second light based on a second mode different from the first mode by a second light source of a second mobile device; identifying the first mobile device and the second mobile device according to the first light and the second light re