Compact type speckle projection module and depth camera

Abstract

The invention relates to the field of 3D topography measurement. The embodiment of the invention provides a compact type speckle projection module and a depth camera. The speckle structure light projection module comprises an array light source and a holographic function unit. The array light source is used for sending laser beams corresponding to a first speckle pattern. The holographic functionunit comprises at least one piece of holographic optical element, and used for executing the following functions that the laser beams are modulated into collimating beams corresponding to the first speckle pattern, the collimating beams are modulated and spread to form a second speckle pattern and the second speckle pattern is projected to a to-be-measured scene object, wherein the holographic optical elements of the holographic function unit are formed by machining and manufacturing through laser interference exposure. And therefore, the holographic function unit composed of holographic optical elements formed by the machining through laser interference exposure is used, no ghost lines interference problem is achieved and stray background light is reduced, better optical modulation effectis realized, and meanwhile the compactness and lightness structure of the module are further guaranteed.

Description

technical field [0001] The invention relates to the field of 3D shape measurement, in particular to a speckle structured light projection module and a 3D depth camera. Background technique [0002] 3D shape measurement technology can collect the depth coordinate information of objects in the scene, providing additional data processing freedom for back-end development. With the popularity of mobile terminal devices and intelligent interactive devices, 3D 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. prospect. [0003] Speckle structured light technology is currently a widely used 3D data acquisition solution. It uses coded random, pseudo-random or regularly arranged spot light clusters as optical probes, and projects them into the space scene. By comparing the spot disp...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the embodiments of the present invention is to provide a speckle structured light projection module and a 3D depth camera to solve the modulation caused by the DOE design based on the etching process in the speckle structured light projection module in the prior art The technical problem that the effect and the compact structure cannot be achieved at the same time

Images