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 includes 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. The structured light spot pattern is formed by at least two sub-structure light spot patterns through staggering and overlapping; the sub-structure light spot pattern is formed by spreading and arranging a plurality of sub-spot patterns generated by a part of light sources in the plurality of sub-light sources, and each sub-spot pattern is composed of spots ofdifferent diffraction orders formed by diffraction of a single sub-light source through the diffraction optical element. According to the invention, on the basis that the distribution of the structured light patterns is uniform, the density distribution of the structured light patterns is improved, and meanwhile, the structure has very high non-correlation.

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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