Dot matrix projection module and depth camera

Abstract

The invention discloses an optical lattice projection module and a depth camera. Including: a light source, used to provide a preset first speckle pattern; a collimator lens, arranged on the light output side of the light source, to receive the first speckle pattern and modulate the first speckle pattern to collimate the first Speckle pattern; Daman grating, the Damman grating is arranged on the light-emitting side of the collimating lens, to receive the collimated first speckle pattern and copy and expand it to obtain a second speckle pattern; projection lens, the The projection lens is arranged on the light exit side of the Damman grating to receive the second speckle pattern and project the second speckle pattern to the target scene to be measured according to a predetermined ratio. Using Damman grating for dot matrix replication expansion can make the diffraction intensity uniformity of the light dot matrix projection module better. Therefore, the depth camera has a relatively uniform depth measurement index, which provides a higher degree of freedom and cooperation for subsequent application development. More precise base parameter values.

Description

technical field [0001] The invention relates to the technical field of three-dimensional depth measurement, in particular to an optical lattice projection module and a depth camera. Background technique [0002] The 3D depth measurement technology can collect the depth coordinate information of the scene target, providing additional data processing freedom for the back-end development. With the popularization of mobile terminal devices and intelligent interactive devices, three-dimensional depth measurement technology has increasingly become the core technology of the new generation of human-computer interaction, and has a wide range of applications in industrial inspection, security retail, somatosensory games, mobile payment and biomedicine. Application prospects. [0003] Speckle structured light technology is a widely used 3D depth measurement solution. It uses coded random, pseudo-random or regularly arranged spot light clusters to project to a specific space scene, a...

AI Technical Summary

Problems solved by technology

However, the intensity uniformity between DOE diffraction orders in the current commonly used projection modules is still insufficient. The projected light spots often have a large difference in intensity between the central area and the edge area, which affects the overall depth acquisition accuracy of the scene, especially in measurement. When objects are far or close, the influence of intensity non-uniformity is more prominent, which greatly restricts the development of 3D depth measurement technology

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