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 first sub-light source array and a second sub-light source array that can be independently controlled, the first / second sub-light source array comprises a plurality of sub-sources arranged in a first / second two-dimensional pattern for emitting a first / second array beam corresponding to the first / second two-dimensional pattern, the lens is used for receiving and converging the first and / or second sub-array light beam(s); the diffraction optical element is used for receiving the first and / or second sub-array light beam(s) which are / is emitted after being converged bythe lens and projecting the first and / or second structured light spot patterned light beam(s) corresponding to the first and / or second sub-array light beam(s), and the sub-structured light spot pattern is formed by spreading and arranging a plurality of sub-spot patterns generated by the plurality of sub-light sources. According to the invention, the non-correlation degree and the density of the structured light pattern are uniformly distributed, the structure light spot pattern with different projection areas and different densities can be generated, and the application is wider.

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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