Three-dimensional reconstruction system and method, mobile device, eye protection method, AR device

Patent metadata

Field	Value
Publication number	US-11346946-B2
Application number	US-201816102532-A
Country	US
Kind code	B2
Filing date	Aug 13, 2018
Priority date	Jan 3, 2018
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

A three-dimensional reconstruction system includes an infrared light source array including a plurality of infrared sub-light sources, and each of the infrared sub-light sources emitting an infrared light, and different infrared sub-light sources being coherent light sources, an infrared detector configured to receive an infrared light reflected from a target object, the reflected infrared light being a reflected light of an interference beam emitted by the coherent light source, a calculation circuit, configured to calculate a reference distance between a reflection point on the target object and the infrared sub-light source according to the reflected infrared light and the infrared light emitted by the infrared sub-light source, and a three-dimensional reconstruction circuit, configured to perform reconstruction of a three-dimensional image on the target object according to the plurality of reference distances.

First claim

What is claimed is:

1. A three-dimensional reconstruction system, comprising:
an infrared light source array comprising a plurality of infrared sub-light sources, and each of the infrared sub-light sources emitting an infrared light, and different infrared sub-light sources being coherent light sources;
an infrared detector configured to receive an infrared light reflected from a target object, wherein the reflected infrared light is a reflected light of an interference beam emitted by the coherent light sources;
a calculation circuit configured to calculate a plurality of reference distances between a reflection point on the target object and the infrared sub-light sources according to the reflected infrared light and the infrared light emitted by the infrared sub-light sources;
a three-dimensional reconstruction circuit configured to perform a reconstruction of a three-dimensional image on the target object according to the plurality of reference distances; and
a light source control circuit configured to control each of the infrared sub-light sources to emit an infrared light of a preset phase such that the interference beam is enhanced in a target region on the target object and weakened to be zero in a non-target region on the target object or beyond the target object.

2. The three-dimensional reconstruction system according to claim 1 , wherein the interference beam is enhanced at the reflection point.

3. The three-dimensional reconstruction system according to claim 1 , wherein the infrared light source array further comprises a collimating lens disposed at a light emitting side of the infrared sub-light sources.

4. The three-dimensional reconstruction system according to claim 1 , wherein the infrared detector comprises an infrared photosensitive device.

5. The three-dimensional reconstruction system according to claim 1 , wherein the three-dimensional reconstruction circuit is further configured to obtain the reference distance between each location of the target object and the infrared sub-light source by traversing all locations of the target object to perform a reconstruction of the three-dimensional image on the target object according to the plurality of reference distances.

6. A three-dimensional reconstruction method, comprising:
emitting coherent infrared lights using a plurality of infrared sub-light sources in an infrared light source array, and different infrared sub-light sources being coherent light sources, wherein emitting the coherent infrared lights using the plurality of infrared sub-light sources in the infrared light source array comprises controlling each of the infrared sub-light sources in the infrared light source array to emit an infrared light of a preset phase such that an interference beam emitted by the coherent light sources is enhanced in a target region on an target object and weakened to be zero in a non-target region on the target object or beyond the target object;
receiving an infrared light reflected from the target object using an infrared detector, wherein the reflected infrared light is a reflected light of the interference beam emitted by the coherent light sources;
calculating a plurality of reference distances between a reflection point on the target object and the infrared sub-light sources according to the reflected infrared light and the infrared light emitted by the infrared sub-light sources; and
performing reconstruction of a three-dimensional image on the target object according to the plurality of reference distances.

7. The three-dimensional reconstruction method according to claim 6 , wherein the interference beam is enhanced at the reflection point.

8. The three-dimensional reconstruction method according to claim 6 , further comprising using a collimating lens to convert the infrared light emitted from the infrared sub-light sources into a plane wave.

9. The three-dimensional reconstruction method according to claim 6 , wherein the infrared detector comprises an infrared photosensitive device.

10. A mobile device having an eye protection function, comprising:
a three-dimensional reconstruction system, a processing circuit, and a warning circuit, wherein the three-dimensional reconstruction system comprises:
an infrared light source array comprising a plurality of infrared sub-light sources, each of the infrared sub-light sources emitting an infrared light, and different infrared sub-light sources being coherent light sources;
an infrared detector configured to receive an infrared light reflected from a target object, wherein the reflected infrared light is a reflected light of an interference beam emitted by the coherent light sources;
a calculation circuit configured to calculate a plurality of reference distances between a reflection point on the target object and the infrared sub-light sources according to the reflected infrared light and the infrared light emitted by the infrared sub-light sources;
a three-dimensional reconstruction circuit configured to perform a reconstruction of a three-dimensional image on the target object according to the plurality of reference distances; and
a light source control circuit configured to control each of the infrared sub-light sources to emit an infrared light of a preset phase such that the interference beam is enhanced in a target region on the target object and weakened to be zero in a non-target region on the target object or beyond the target object;

the three-dimensional reconstruction system being configured to obtain a three-dimensional image of a human face according to a reference distance between a plurality of reflection points of the human face and an infrared sub-light source;
the processing circuit being configured to acquire a relative position relationship between a human eye and a mobile device based on the three-dimensional image of the human face and determining whether the relative position relationship satisfies a preset result; and
the warning circuit being configured to issue a prompt when the relative position relationship between the human eye and the mobile device satisfies the preset result.

11. The mobile device according to claim 10 , wherein the preset result comprises: a distance between the human eye and the mobile device is less than a preset distance.

12. The mobile device according to claim 10 , wherein the preset result comprises: an angle between the human eye and the mobile device is greater than a preset angle.

13. An eye protection method applied to a mobile device, comprising:
obtaining a three-dimensional image of a human face according to a reference distance between a plurality of reflection points of the human face and an infrared sub-light source using a three-dimensional reconstruction method, wherein the three-dimensional reconstruction method comprises:
emitting coherent infrared lights using a plurality of infrared sub-light sources in an infrared light source array, and different infrared sub-light sources being coherent light sources, wherein emitting the coherent infrared lights using the plurality of infrared sub-light sources in the infrared light source array comprises controlling each of the infrared sub-light sources in the infrared light source array to emit an infrared light of a preset phase such that an interference beam emitted by the coherent light sources is enhanced in a target region on a target object and weakened to be zero in a non-target region on the target object or beyond the target object;
receiving an infrared light reflected from the target object using an infrared detector, wherein the reflected infrared light is a reflected light of the interference beam emitted by

Assignees

• Beijing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Lu Yuanjie
• Zhang Xuebing
• Li Xi
• Chu Minglei

Classifications

• G01S17/89 Primary

  for mapping or imaging · CPC title

• G01S17/08 Primary

  for measuring distance only (indirect measurement G01S17/46; active triangulation systems G01S17/48) · CPC title

• G01S7/4815

  using multiple transmitters · CPC title