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Method for realizing real-time three-dimensional shape measurement by using unequal step phase shifting cross grating

An orthogonal grating and three-dimensional surface technology, applied in the field of optical three-dimensional sensing, can solve the problem of low precision of three-dimensional reconstruction and achieve high measurement accuracy

Inactive Publication Date: 2010-02-24
SICHUAN UNIV
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the defect of low accuracy of three-dimensional reconstruction for decoding a frame of stripes, and propose a real-time three-dimensional surface measurement method using non-equal-step phase-shifted orthogonal gratings in three-dimensional sensing technology measurement

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  • Method for realizing real-time three-dimensional shape measurement by using unequal step phase shifting cross grating
  • Method for realizing real-time three-dimensional shape measurement by using unequal step phase shifting cross grating
  • Method for realizing real-time three-dimensional shape measurement by using unequal step phase shifting cross grating

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings and working principles.

[0016] The optical path of real-time three-dimensional surface shape measurement with non-equal-step phase-shifted orthogonal grating is similar to that of traditional phase measurement profilometry. figure 1 is the projection light path of the PMP method, P 1 and P 2 are the entrance pupil and exit pupil of the projection system, I 2 and I 1 are the entrance and exit pupils of the imaging system. The imaging optical axis is perpendicular to the reference plane, and the included angle with the projection optical axis is θ, they intersect at point O on the reference plane, d is the distance between the optical center of the detector and the optical center of the projection device, l is the detector light The distance from the center to the reference plane.

[0017] A group of non-equal-step phase-shift gratings is designed by comput...

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Abstract

The invention provides a method for measuring three-dimensional shapes and deformation of objects in real time by using unequal step phase shifting cross grating in the three-dimensional sensor technology. The invention is characterized by using computers to design the unequal step phase shifting cross grating of codes, adopting an optical projection means to image a face structured tuned templateof the grating on the surface of an object by projection, using a pick-up device to record the deforming fringe pattern of the object, subsequently processing the deforming fringes by a Fourier transform spectrum filtering method and unequal step phase shifting phase measuring profilometry, accurately restoring the three-dimensional shape of the object and obtaining such digital information as deformation of the object and the like by further analyzing the data processing results. The method can be used for measurement study of the characteristics of the object surface with the characteristicof diffuse reflection. The method has the advantages of high measurement precision, quick response and good capability of obtaining the three-dimensional shape data and the like of the object in realtime.

Description

1. Technical field [0001] The invention relates to the optical three-dimensional sensing technology, in particular to the real-time three-dimensional surface shape measurement of the object by using the non-equal-step phase-shifting orthogonal grating based on the phase measurement profilometry method. 2. Technical background [0002] Three-dimensional surface measurement is of great significance in the fields of machine vision, biomedicine, industrial inspection, rapid prototyping, film and television special effects, and product quality control. Optical three-dimensional sensing technology has been widely researched and applied due to its advantages of non-contact, high precision, large-area measurement, and easy automatic control. Existing optical three-dimensional sensing methods mainly include: triangulation, Moiré Topography (MT for short), Fourier Transform Profilometry (FTP for short), Spatial Phase Detection (Spatial Phase Detection, SPD for short), Phase Measuring...

Claims

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Application Information

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IPC IPC(8): G01B11/25
Inventor 曹益平何宇航苏显渝向立群陈文静张启灿刘元坤
Owner SICHUAN UNIV
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