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Dynamic object three-dimension measuring method

A three-dimensional measurement and object technology, applied in measurement devices, instruments, optical devices, etc., can solve the problems of low measurement accuracy and large errors, and achieve the effect of good noise suppression ability

Inactive Publication Date: 2018-09-18
XIAN UNIV OF TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a three-dimensional measurement method for dynamic objects, using the two-dimensional wavelet transform method based on the improved value function to solve the main value of the phase and the three-dimensional phase expansion to obtain the actual phase, so as to realize the three-dimensional measurement of dynamically changing objects and solve the problem of the prior art There are problems of large error and low measurement accuracy

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] The method of the present invention proposes for the first time a two-dimensional wavelet transform wavelet ridge extraction algorithm based on an improved value function to solve the principal value of the phase, and optimizes and adjusts the weight coefficient. Compared with the direct maximum mode two-dimensional wavelet transform wavelet ridge extraction algorithm and The two-dimensional wavelet transform wavelet ridge extraction method based on the value function has better noise resistance and robustness; at the same time, a three-dimensional space phase unwrapping method is proposed to achieve a small inter-frame phase change and a certain frame. 3D measurement of dynamically changing objects with large contour gradients.

[0025] Method of the present invention, implement according to the following steps:

[0026] Step 1. Base...

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Abstract

The invention discloses a dynamic object three-dimension measuring method comprising the following steps: 1, using a two-dimension wavelet transformation wavelet ridge extraction algorithm based on animproved value function to solve a phase principal value; 2, using the improved value function to adjust a weight factor; 3, unwrapping the three dimensional phases, and unwrapping the phases in a time axis direction t; Pk refers to certain pixel point of a wrapped phase of the kth frame striped image; when the Pk is wrapped by red enclosing branch-cuts and the phase cannot be unwrapped in the two-dimension direction, the phase of Pk can be calculated by using the wrapping phase of Pk-1 of the k-1th frame striped image. The dynamic object three-dimension measuring method has a better three dimensional phase unwrapping result, and has a better noise inhibition capability.

Description

technical field [0001] The invention belongs to the technical field of grating projection three-dimensional measurement and relates to a method for three-dimensional measurement of a dynamic object. Background technique [0002] In recent years, dynamic 3D surface shape measurement based on structured light projection has become a research hotspot. In the fields of continuous deformation detection of stamping plate, detection of automobile collision deformation process, deformation detection of bullet impact helmet, and kinematics analysis, etc., it is necessary to observe the dynamic change process of the object contour to provide important data for designers to improve product design and product quality. The phase-shifting method has high measurement accuracy, is insensitive to environment and noise, and has strong anti-interference ability, but at least three fringe images are required. The phase obtained by the phase shift method is obtained through the arc tangent, whi...

Claims

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Application Information

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IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 杨延西王建华马晨
Owner XIAN UNIV OF TECH
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