Design method of optical pattern, an area array projection device and depth camera

Abstract

The invention discloses a design method of an optical pattern. The method comprises the following steps of generating a first regular pattern, wherein the first pattern includes a plurality of first spot particles which are arranged according to a fixed transverse and longitudinal spacing; randomly moving each first spot particle in the first pattern and acquiring a second pattern; and rearranging the first spot particles in the second pattern according to a preset rule and acquiring a first optical pattern, wherein the first optical pattern is a light source arrangement pattern and is used for forming a composite optical pattern after the first optical pattern and a second optical pattern are combined; and the second optical pattern is the pattern formed through beam expansion of a single beam of light via a diffractive optical component. The invention also discloses an area array projection device and a depth camera. Through the above mode, the uniform composite optical pattern possessing high irrelevance can be acquired; and simultaneously the projection device made through using the design method possesses advantages of a small size, low power consumption and uniform transmission.

Description

technical field [0001] The invention relates to the field of optics, in particular to an optical pattern design method, an area array projection device and a depth camera. Background technique [0002] Depth cameras are currently widely used in somatosensory games, robotics and UAV vision systems due to their advantages such as high precision and fast acquisition speed. The depth camera includes a projection module, which generally consists of a single laser light source, a lens, and a diffractive optical element (Diffractive Optical Elements, DOE). The depth camera projects a fixed structured light speckle pattern to the target space through its projection module, and the style of the structured light speckle pattern is often determined by the DOE. [0003] As the application fields of depth cameras become more and more extensive, in addition to robots, drones and other equipment, depth cameras will gradually be integrated into devices such as tablets and mobile phones, wh...

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Problems solved by technology

[0003] As the application fields of depth cameras become more and more extensive, in addition to robots, drones and other equipment, depth cameras will gradually be integrated into devices such as tablets and mobile phones, which requires depth cameras to have a smaller size, more Low power consumption and stronger performance, while projection modules using a single laser light source often cannot meet this requirement

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