A structured light projection module and depth camera

Abstract

The invention provides a structured light projection module and a depth camera. The structured light projection module comprises a light source array, a lens, and a diffraction optical element, the light source array comprises a plurality of sub-light sources arranged in a two-dimensional pattern mode for emitting array light beams corresponding to the two-dimensional pattern; the lens is used forreceiving and converging the array light beams; the diffraction optical element is used for receiving the array light beams which are emitted after being converged by the lens, and projecting a structured light spot patterned light beam; wherein the structured light spot pattern is composed of a plurality of spot blocks corresponding to the two-dimensional pattern through the laying and arranging, each spot block is composed of spots with the same diffraction level formed after the plurality of sub-light sources are diffracted by the diffraction optical element, and the edges of the spot blocks are non-linear and are mutually coupled. The structured light spot pattern has very high incorrelation, and meanwhile, the randomness of spot distribution at the connection position of the adjacentsub-spot patterns is improved; and density distribution, non-correlation degree and other key indexes are well unified.

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. [0003] The structured light projection module is the core device in the depth camera based on structured light technology. It mainly uses the light source to emit light beams and modulates the optical elements to emit structured light patterns. The size, energy consumption and Performance determines the size, power consumption and performance of the depth camera. Structured light spot (speckle) pattern is currently a widely used and mature projection scheme. Its principle is mainly to use laser light...

AI Technical Summary

Problems solved by technology

[0005] However, in the current scheme, it is difficult to achieve better unity in key indicators such as the power consumption of the structured light projection module, the density distribution of the projection pattern, and the degree of irrelevance.

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