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Phase unwrapping method and device for optical dynamic three-dimensional measurement

A three-dimensional measurement and unwrapping technology, which is applied to measurement devices, optical devices, image data processing, etc., can solve problems such as increasing the unwrapping error rate, reducing the sampling frame rate, and increasing the data collection time.

Active Publication Date: 2021-09-07
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it needs to collect additional pictures, which will increase the data acquisition time and reduce the sampling frame rate, and at this time the phase error and change caused by the movement of the object will increase the unwrapping error rate

Method used

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  • Phase unwrapping method and device for optical dynamic three-dimensional measurement
  • Phase unwrapping method and device for optical dynamic three-dimensional measurement
  • Phase unwrapping method and device for optical dynamic three-dimensional measurement

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Experimental program
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Embodiment 1

[0081] refer to Figure 7 , the inventive method comprises the following steps:

[0082] Step 1: Collect a set of fixed-frequency sinusoidal fringe patterns and pictures required by the time-domain phase unwrapping method, and use the time-domain phase unwrapping method to calculate the unwrapped phase map Φ of the sinusoidal fringe pattern h (x,y), and Φ h The phase at the background point in (x,y) is set to an invalid value. The time-domain phase unwrapping method selected in this embodiment is the multi-frequency phase unwrapping method. The multi-frequency unwrapping method is a commonly used phase unwrapping method in the time domain, which has the advantages of high computational efficiency, wide application range, and strong robustness. It requires collecting at least two groups of fringe patterns with different frequencies, and the period of the fringe pattern with the lowest frequency can generally completely cover the entire measurement surface. When unwrapping, ...

Embodiment 2

[0139] An optical dynamic three-dimensional measurement phase unwrapping device includes an acquisition module and a processing module. The acquisition module is used to collect the fringe pattern and the pictures required by the time-domain phase unwrapping method, and transfer the collected fringe pattern and the pictures required by the time-domain phase unwrapping method to the processing module; The image required by the domain phase unwrapping method to obtain the unwrapped phase map.

[0140] The optical dynamic three-dimensional measurement phase unwrapping device may be computing equipment such as desktop computers, notebooks, palmtop computers, and cloud servers. The optical dynamic three-dimensional measurement phase unwrapping device may include, but not limited to, a processor and a memory.

[0141] The processor can be a central processing unit (Central Processing Unit, CPU), and can also be other general-purpose processors, digital signal processors (Digital Si...

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Abstract

The invention discloses a phase unwrapping method and device for optical dynamic three-dimensional measurement, and the method is mainly characterized in that during dynamic continuous measurement, an unwrapping phase obtained by the previous measurement is used as a reference phase to unwrap a wrapping phase obtained by the current measurement. The method disclosed by the invention is efficient, rapid and easy to implement; the number of pictures required to be acquired for continuous multiple measurements can be greatly reduced, the measurement time is remarkably shortened, and the dynamic measurement efficiency is improved; the problem of boundary phase unwrapping abnormity caused by object movement in dynamic measurement can be solved; larger phase errors can be resisted, and the influence of the phase errors caused by random noise, object motion and other factors on phase unwrapping is reduced; the method can be applied to three-dimensional shape dynamic measurement of a complex object with a discontinuous surface.

Description

technical field [0001] The invention belongs to the technical field of optical three-dimensional measurement, and in particular relates to a phase unwrapping method and device for optical dynamic three-dimensional measurement. Background technique [0002] High-efficiency, high-precision dynamic 3D shape and deformation measurement are widely demanded in aerospace, machinery manufacturing and other fields. The 3D shape measurement technology based on structured light method has been fully developed in static measurement, but its dynamic measurement There are still many problems to be solved urgently. The optical three-dimensional measurement technology based on phase measurement often needs to unwrap the wrapped phase. Commonly used methods include spatial phase unwrapping method and time domain phase unwrapping method. The spatial phase unwrapping method does not need to collect additional pictures for unwrapping, and the data acquisition speed is fast, which can improve t...

Claims

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Application Information

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IPC IPC(8): G01B11/25G06T7/60
CPCG01B11/254G06T7/60
Inventor 赵宏鲍勍慷张春伟刘发恒张天宇张振洋
Owner XI AN JIAOTONG UNIV