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Structural light projection module for projecting unrelated pattern

A technology of structured light projection and structured light pattern, applied in diffraction grating, optics, photography, etc., can solve the problem of uncorrelated structured light patterns, and achieve the effect of improving accuracy

Active Publication Date: 2019-03-26
SHENZHEN ORBBEC CO LTD
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Problems solved by technology

[0004] The present invention proposes a diffractive optical element, a structured light projection module and its depth camera to solve the problem of irrelevant structured light patterns

Method used

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  • Structural light projection module for projecting unrelated pattern
  • Structural light projection module for projecting unrelated pattern
  • Structural light projection module for projecting unrelated pattern

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be emphasized that the following descriptions are only exemplary and not intended to limit the scope of the present invention and its application.

[0019] For the structured light projection module that projects speckle (speckle, structured light) patterns and the depth camera based on this module, the density of the speckle pattern will affect the accuracy of the depth image finally output by the depth camera. In addition to the density, the speckle pattern The degree of uncorrelation also has an important impact on the accuracy. The degree of irrelevance of the speckle pattern generally refers to arbitrarily selecting a small area of ​​a certain pixel area in the pattern (such as 7x7 or 11x11 pixels, etc.), and the speckle arrangement features in this area have unique sex.

[0020] Therefore, when designi...

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Abstract

The invention discloses a diffraction optical element for projecting a unrelated pattern. First patterned light beams are received, and the first patterned light beams are diffracted so as to projecta second patterned light beam. The second patterned light beam is formed by combining and arranging the plurality of first patterned light beams, and combined arrangement is periodically arranged along a first direction and a second direction. And the first direction and the second direction are not vertical to each other. Through designing the performance of the diffractive optical element, a structured light pattern which is projected to the outside world is periodically arranged along two directions. And the two directions are not vertical to each other. Spot patterns have highly irrelevantperformance along multiple directions so that precision is increased.

Description

technical field [0001] The invention relates to the field of manufacturing electronic and optical components, in particular to a diffractive optical element for projecting irrelevant patterns, a structured light projection module and a depth camera. Background technique [0002] The depth camera can obtain the depth information of the target to realize 3D scanning, scene modeling, and gesture interaction. Compared with the currently widely used RGB camera, the depth camera is gradually being valued by all walks of life. The combination of computers and other devices can realize somatosensory games to achieve the effect of two-in-one game and fitness. With the rapid popularization of mobile terminals such as mobile phones and tablets, there is an urgent need to embed depth cameras into mobile terminals. Mobile terminals with depth cameras can achieve more accurate and reliable face recognition and gesture interaction than ordinary RGB cameras. , and even functions such as AR...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/42
CPCG02B27/4205G02B5/18G03B15/02G02B27/48G01B11/2513G01B11/25G02B27/425
Inventor 许星王兆民黄源浩
Owner SHENZHEN ORBBEC CO LTD
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