A three-dimensional measurement method for modulating Gray code information at periodic edges

A three-dimensional measurement and Gray code technology, applied in measurement devices, instruments, optical devices, etc., can solve the problems of low spatial phase unwrapping accuracy, slow time phase unwrapping speed, etc. high effect

Active Publication Date: 2022-07-15
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0004] In view of the above-mentioned defects, the purpose of the present invention is to propose a three-dimensional measurement method for modulating Gray code information at the edge of the period, so as to solve the problems of low spatial phase unwrapping accuracy and slow time phase unwrapping speed

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  • A three-dimensional measurement method for modulating Gray code information at periodic edges
  • A three-dimensional measurement method for modulating Gray code information at periodic edges
  • A three-dimensional measurement method for modulating Gray code information at periodic edges

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[0054] The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "top", "bottom", "left", " The orientation or position relationship indicated by "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is Based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present in...

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Abstract

The object of the present invention is to propose a three-dimensional measurement method for modulating Gray code information on a periodic edge, comprising the following steps: Step A: According to the total number of phases and the coding rule of the Gray code, the total number of steps is converted into a Gray code, and the Gray code is converted into a Gray code. The code is modulated on the periodic edge; Step B: generate a sinusoidal fringe pattern with N modulated Gray codes on the periodic edge according to the requirements of the N-step phase shift method; Step C: The projector projects the generated N sinusoidal fringe patterns on the surface of the object to be measured; Step D: Calculate the wrapped phase and mean intensity for N sinusoidal fringe patterns collected by the camera according to the N-step phase shift method; Step E: Use the edge extraction algorithm to extract the edge coordinates of all periodic edges; Step F: For each pixel of the wrapped phase , and the absolute phase is obtained by pixel-by-pixel unwrapping; Step G: Reconstructing a three-dimensional point cloud according to triangulation ranging to build a three-dimensional model of the object to be measured.

Description

technical field [0001] The invention relates to the technical field of optical three-dimensional measurement, in particular to a three-dimensional measurement method for modulating Gray code information on a periodic edge. Background technique [0002] Structured light measurement technology has the advantages of non-contact, full-field lossless measurement, high precision, and fast speed. It has been widely used in industrial inspection, machine vision, cultural relic digitization, medicine and other fields. In the existing structured light measurement system, a structured light 3D measurement system composed of a camera and a projector is widely used because of its simple structure and high efficiency of point cloud reconstruction. In a typical single-camera structured light three-dimensional measurement system, the projection device projects the fringe pattern onto the surface of the measured object during the measurement process, and at the same time, the camera is used ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 郑卓鋆高健张揽宇庄逸钟邓海祥陈云陈新
Owner GUANGDONG UNIV OF TECH
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