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Structured light projection module and depth camera

A structured light projection and module technology, applied in optics, photography, optical components, etc., can solve problems such as reducing the uniformity of speckle patterns, achieve uniform density distribution, high-precision 3D measurement, and satisfy the effects of irrelevance

Active Publication Date: 2018-02-16
SHENZHEN ORBBEC CO LTD
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

However, in order to improve the calculation accuracy, that is, to ensure uniform spot density distribution, the arrangement of VCSEL array chips and the randomness of sub-spot patterns will reduce the uniformity of the final projected spot pattern

Method used

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  • Structured light projection module and depth camera
  • Structured light projection module and depth camera
  • Structured light projection module and depth camera

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Embodiment Construction

[0046] Embodiments of the present invention will be described in detail below. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0047] figure 1 It is a schematic diagram of a depth camera based on structured light technology. The depth camera includes a structured light projection module 11 and an acquisition module 12. The structured light projection module is used to project a structured light pattern into the spatial projection area A, and the acquisition module is used to acquire structured light images on objects in its acquisition area B , generally the projection area A is not lower than the collection area B, so as to ensure that the objects in the collection area corresponding to the collection module can be covered by the structured light pattern. In addition, the depth camera also includes a processor for receiving the structured light image collected by the collect...

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Abstract

The present invention discloses a structured light projection module and a depth camera. The structured light projection module comprises: a light source comprising a plurality of sub light sources arranged to a two-dimensional array and configured to emit a two-dimensional patterning light beam being consistent to the two-dimensional array; a diffractive optical element configured to receive thetwo-dimensional patterning light beam, and project a plurality of two-dimensional patterning light beams which are not overlapped with one another, wherein each two-dimensional patterning light beam correspondingly generates one copied pattern, and the plurality of copied patterns which are not overlapped with one another form spot patterns with uniform density distribution. The structured light projection module can project combined spot patterns with uniform density distribution in a condition that irrelevance can be met.

Description

technical field [0001] The invention relates to a structured light projection module and a depth camera. Background technique [0002] 3D imaging technology is the core of the new generation of human-computer interaction technology. With the rigid demand of mobile terminal equipment for 3D imaging technology, depth cameras will be widely used in mobile terminal equipment, which also makes depth cameras move towards low power consumption. , high performance, and small volume. The structured light projection module is the core device in the depth camera based on structured light technology, and its main components are light source and diffractive optical element (DOE). Diffractive Optical Elements (DOE) have the function of modulating light beams, such as splitting incident light beams to generate outgoing light beams with specific structured patterns. A typical solution is to use a laser emitter to emit a single beam and then pass through a collimator lens and a diffractive...

Claims

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Application Information

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IPC IPC(8): G02B27/42G03B35/00G03B15/02
CPCG02B27/425G03B15/02G03B35/00
Inventor 许星
Owner SHENZHEN ORBBEC CO LTD
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