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Fast color fringe pattern phase demodulation algorithm and system

A phase demodulation and color fringe technology, which is applied in the field of fast color fringe image phase demodulation algorithm and system, can solve the problems that efficiency and accuracy cannot be taken into account at the same time, and is beneficial to dynamic three-dimensional measurement, realizing color imbalance correction, fast The effect of phase demodulation

Pending Publication Date: 2021-11-16
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] Aiming at the problem that the existing dynamic three-dimensional shape measurement technology is limited by the phase demodulation method, and the efficiency and accuracy cannot be taken into account at the same time, the purpose of the present invention is to propose a highly robust phase demodulation method, which can quickly solve the demodulation phase , to meet the needs of dynamic measurement

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  • Fast color fringe pattern phase demodulation algorithm and system
  • Fast color fringe pattern phase demodulation algorithm and system
  • Fast color fringe pattern phase demodulation algorithm and system

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[0062] In order to make the purpose and technical solution of the present invention clearer and easier to understand. The present invention will be further described in detail below in conjunction with the drawings and embodiments. The specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0063] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular ori...

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Abstract

The invention discloses a fast color fringe pattern phase demodulation algorithm and system, and the method comprises the steps: firstly carrying out the pre-calibration of a measurement system through a calibration flat plate, and solving a coupling strength coefficient; secondly, using the system to respectively project a uniform intensity graph and a color fringe graph to an object to be measured, after the two graphs are respectively decoupled, using the uniform intensity graph to solve a background item and a modulation degree, and performing background removal and color normalization on the color fringe graph to obtain three background-free and color-normalized fringe patterns; adopting a phase shift method to solve demodulation phases of the three fringe patterns; and finally, unwrapping the obtained demodulation phase to obtain an unwrapped phase. The phase shift method demodulation of the single color fringe pattern is realized after background item calibration, the robustness of the demodulation of the traditional gray phase shift method is reserved, the fast phase demodulation is realized, and the requirement of dynamic three-dimensional shape measurement is met.

Description

technical field [0001] The invention belongs to the technical field of optical three-dimensional measurement, and in particular relates to a fast color fringe image phase demodulation algorithm and system. Background technique [0002] In recent decades, dynamic three-dimensional shape measurement technology has been widely used in various fields, such as machine vision, industrial automatic inspection, product quality control, physical profiling, biomedicine and film and television special effects production, etc. In order to realize fast 3D measurement of dynamic objects, multi-camera stereo vision methods and fringe profilometry are usually used. Among them, stereo vision has low measurement accuracy due to the uncertainty of stereo matching, and multi-camera increases the measurement cost. The fringe projection profilometry has the advantages of non-contact, full field and high precision, and has been widely developed and applied. The fringe projection profilometry met...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
CPCG01B11/25G01B11/2504G01B11/2527
Inventor 赵宏朱倩
Owner XI AN JIAOTONG UNIV
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