Title:
STRUCTURE LIGHT DETECTION DEVICE AND DETECTION METHOD, IDENTITY RECOGNITION DEVICE AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/223002
Kind Code:
A1
Abstract:
The present application is applicable to the field of optical and electronic technologies, and provides a structure light detection device for detecting whether a diffractive optical element in a light source module is damaged or detached, so as to avoid the presence of unsafe zero-order diffracted light in the structure light generated by the light source module, or to prevent the light emitted by the light source of the light source module from being directly emitted without being modulated by the diffractive optical element. The structure light detection device comprises a sensing module and an image analysis module. The sensing module acquires light beams reflected after the structure light emitted by the light source module is projected onto a target object, so as to obtain at least one structure light image. The image analysis module analyzes the brightness of different regions in the at least one structure light image to determine whether the diffractive optical element is damaged or detached. The present application further provides a structure light detection method, an identity recognition device and an electronic device. The present application can effectively detect whether there is unsafe zero-order diffracted light in the structure light, and whether direct irradiation of the light source occurs.
Inventors:
TIAN PUYAN (CN)
Application Number:
PCT/CN2018/088473
Publication Date:
November 28, 2019
Filing Date:
May 25, 2018
Export Citation:
Assignee:
SHENZHEN FUSHI TECH CO LTD (CN)
International Classes:
G01M11/00
Foreign References:
| CN107884157A | 2018-04-06 | |||
| CN107608167A | 2018-01-19 | |||
| CN107860558A | 2018-03-30 |
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