Light diffusion type speckle projector, focusing method thereof and three-dimensional reconstruction system

Abstract

The invention provides a light diffusion type speckle projector, focusing method thereof and three-dimensional reconstruction system. The speckle projector includes at least one semiconductor laser and at least one diffraction optical component arranged in a light path of the semiconductor laser for forming a light beam having a speckle pattern after laser emitted by the semiconductor laser penetrates through the diffraction optical component. The speckle projector does not need a collimator arranged between the semiconductor laser and the diffraction optical component. Therefore, quality of the light beam having the speckle pattern projected by the speckle projector can be improved and the minimization of the speckle projector is facilitated, especially, the height dimension of the speckle projector can be reduced.

Description

technical field [0001] The invention relates to a speckle projector, in particular to a diverging light speckle projector, its focusing method and a three-dimensional reconstruction system. Background technique [0002] With the maturation of camera technology and the continuous rapid development of the camera industry, the functions of the camera module are no longer limited to ordinary photos. have been widely used. For example, the projector can project compiled light to the object or scene, and then the camera module can obtain the depth information associated with the object or scene by obtaining the light reflected by the object or scene, so as to realize 3D mapping, modeling or 3D reconstruction of objects or scenes. Usually (not all cases), the projector can be implemented as a speckle projector, which can project light with a speckle pattern to an object or scene, so that it can be received by the camera module later by the object or Light with a speckle pattern ...

AI Technical Summary

Problems solved by technology

However, limited by the existing technology, the periphery of the speckle pattern produced by the speckle projector will have deformation, and some undesirable phenomena such as uneven brightness, that is, the zero-order diffraction phenomenon of the speckle projector is relatively serious, and the speckle The brightness of the spot array is uneven, and the surrounding distortion is large, which affects the subsequent depth information processing, so that it has a great impact on the subsequent acquisition of depth information of objects or scenes.

[0004] In addition, the relative positions of the semiconductor laser 10P, the collimating mirror 20P, and the diffractive optical component 30P of the speckle projector in the prior art are relatively fixed, so that the height of the entire speckle projector cannot be reduced, so that it becomes The technical bottleneck for the continued development of the speckle projector

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