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Projection grating phase shift generation dynamic three-dimensional measurement method and system

A three-dimensional measurement and phase shift technology, applied in measurement devices, optical devices, instruments, etc., can solve problems such as low measurement efficiency, and achieve the effects of improving stability, balancing contradictory relationships, and enriching measurement information

Active Publication Date: 2022-04-12
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, this solution requires continuous sampling of multiple frames of images of the measured object, and the sampling process must ensure that the measured object is still to avoid introducing dynamic errors, so the measurement efficiency is low

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  • Projection grating phase shift generation dynamic three-dimensional measurement method and system
  • Projection grating phase shift generation dynamic three-dimensional measurement method and system
  • Projection grating phase shift generation dynamic three-dimensional measurement method and system

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Embodiment Construction

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0060] This embodiment provides a preferred implementation of a projected grating phase shift generation method, such as figure 1 shown, including

[0061] S1. Project the sinusoidal grating to the measured object, and collect the distorted sinusoidal grating at high speed;

[0062] S2. Perform Fourier transform analysis on the obtained distorted sinusoidal grating signal, and extract positive and negative frequency sidelobe signals of the distorted sinusoida...

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Abstract

The invention belongs to the field of moving object surface topography dynamic 3D reconstruction, and particularly relates to a projection grating phase shift generation dynamic 3D measurement method and system, and the method comprises the steps: carrying out the sinusoidal grating projection and sampling of a moving object; fourier spectrum analysis is carried out on the single-frame transient sampling image, and a multi-frame phase shift image sequence is generated; performing high-precision phase solution and phase unwrapping on the phase shift grating sequence by using a phase shift algorithm and a phase unwrapping algorithm to obtain the three-dimensional morphology of the object at the sampling moment; performing 360-degree constant-speed rotation dynamic scanning on the object to obtain three-dimensional shape information of the object at different scanning angles; and carrying out image splicing on the scanned three-dimensional features through a three-dimensional image splicing method so as to obtain 360-degree panoramic dynamic three-dimensional reconstruction information of the measured object. According to the invention, a multi-frame phase shift image sequence is obtained from a single-frame transient sampling image in an image generation mode, so that the measurement precision is effectively improved, and the balance between the measurement efficiency and the measurement precision is realized.

Description

technical field [0001] The invention specifically relates to a method and system for dynamic three-dimensional measurement generated by projected grating phase shift, belonging to the field of three-dimensional dynamic measurement. Background technique [0002] As a non-contact measurement method, structured light projection 3D measurement has great application value in the fields of part shape detection, industrial reverse design or biomedicine. In recent years, with the rapid development of related software and hardware technologies such as computers, sensors, and intelligent algorithms, structured light projection 3D measurement technology has continuously made major breakthroughs, and is constantly developing in the direction of high precision and high efficiency. [0003] Dynamic 3D measurement is an important application field of structured light projection 3D reconstruction. However, the contradiction between accuracy and efficiency is a major challenge. From the per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
Inventor 邓钦元侯杰付蔚黄学达张焱
Owner CHONGQING UNIV OF POSTS & TELECOMM
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