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Gray code based phase development method in three-dimensional scanning system

A phase unwrapping and three-dimensional scanning technology, applied in the field of phase unwrapping, can solve the problems of increasing the difficulty of finding fringes, prone to "pulling lines, and independence between pixels"

Inactive Publication Date: 2007-03-14
HAIAN COUNTY SHENLING ELECTRICAL APPLIANCE MFG +1
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Problems solved by technology

The triangulation method has a clear principle and good real-time performance, but the density of the measurement points is not high. If thinner fringes are used for projection, it will be more difficult to find fringes, so we use the phase method for processing
When using the traditional phase resolution method, due to the non-independence between pixels, it is easy to appear "pull line" phenomenon at the physical discontinuity area and noise point

Method used

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  • Gray code based phase development method in three-dimensional scanning system
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  • Gray code based phase development method in three-dimensional scanning system

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Embodiment Construction

[0032] The specific implementation manners of the present invention will be further described below in conjunction with the drawings. According to the above method, the operation of phase unwrapping is realized by programming in C++ through VC++6.0 platform in Windows operating system. This example is to perform phase acquisition, phase unwrapping and phase compensation on a motorcycle fender with a partly reflective area in the lower left corner in the 3D scanning system, and finally obtain accurate and complete full-field phase information.

[0033] According to the requirements of space binary coding, design a total of seven gradually dichotomized projection grating images and four grating phase shift images with 90° phase shift, project them onto the measured object, and then take them back to the computer by CCD, according to the four phase shifts Figure, using the phase shift method, according to The folded phase map with the phase value in the range of -π~π can be obt...

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Abstract

The related phase expand method based on Gray code in 3D scanning system comprises: according to space binary coding requirements, designing seven gradual-dimidiating projection grating graphs and four grating 90deg phase shift graphs; projecting to the target, using CCD to take photo back to a computer; obtaining the folding-phase graph between -pi ~ pi; cutting the projection graph as threshold, Gray coding, and dividing accurate period to expand the folding-phase graph and obtain the only phase value; finally, to the failed area, traverse comparing and compensating phase for expand.

Description

technical field [0001] The invention mainly relates to a method for phase unwrapping using a three-dimensional scanning system based on Gray codes in reverse engineering. The invention belongs to the technical field of three-dimensional information reconstruction. Background technique [0002] When the grating is projected onto the surface of the object, the phase of the periodic grating is modulated by the height profile of the object surface, forming a deformed grating, which carries the three-dimensional information of the object. Accurately obtaining the phase information modulated by the height of the object and performing phase unwrapping is the core of the fringe image automatic analysis technology, which plays a key role in finally obtaining the three-dimensional information of the object. Reverse Engineering (Reverse Engineering, RE) technology is a new technology that appeared in the field of advanced manufacturing in the late 1980s. It generally includes four bas...

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Application Information

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IPC IPC(8): G01B11/24G01B11/25G03B21/00
Inventor 达飞鹏李红岩
Owner HAIAN COUNTY SHENLING ELECTRICAL APPLIANCE MFG
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