A Separation Method of Superimposed Phase Shift Grating Based on Derivation

Abstract

The invention discloses a derivation-based separation method of a superimposed phase-shift grating, including a first projector, a second projector and a camera; the separation method includes: (1) designing a projected phase-shift grating, wherein the first The fringe direction of the phase-shift grating projected by the projector is perpendicular to the phase-shift grating projected by the second projector; (2) Based on the designed phase-shift grating, the measured object is projected at the same time, forming a Superimposed phase-shifted gratings, and the superimposed phase-shifted gratings are collected by the camera; (3) The superimposed phase-shifted grating separation method based on derivation processes and separates the four superimposed phase-shifted gratings, and solves to obtain the corresponding main phase. Through the separation method of the present invention, the independent main phase information of the two perspective projections of the measured object is successfully obtained, and the grating separation is completed. At the same time, relatively complete main phase information of the measured object is obtained, and the measured object based on structured light vision The three-dimensional measurement can be realized.

Description

technical field [0001] The invention relates to three-dimensional measurement of structured light vision, in particular to a separation method of superimposed phase-shifting gratings in the three-dimensional measurement of double-projection structured light vision based on a derivation separation method. Background technique [0002] Optical three-dimensional measurement technology is a very important research field in both modern industry and academic research. It is an important part of the national intelligent manufacturing 2025 development strategic plan and has broad market demand and application prospects. It has a wide range of applications in manufacturing, aerospace, scientific research, cultural, medical, social security and other fields, such as product design and processing, lunar rover exploration, cultural relics protection, 3D imaging of human organs and structures, human face identification etc. However, with the development of industry, many applications ha...

AI Technical Summary

Problems solved by technology

1. Due to the self-occlusion problem caused by the contour shape of the surface of the measured object, the projection light cannot be normally projected to the measured surface where the measured object is blocked

2. Due to the limited measurement angle of view of the single camera-single projector three-dimensional measurement structure, it is impossible to obtain all-round measured information of the measured object

However, the color crosstalk between the channels of the color projector and the color CCD camera involved in color coding will directly affect the calculation of the phase and reduce the accuracy of the three-dimensional shape measurement of the object.

Yan et al. of Huazhong University of Science and Technology realized the separation of multi-projection overlapping signals by encoding the projected grating with a De Bruin sequence. However, this method is complex and depends on specific encoding signals.

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