Dynamic three-dimensional measurement method and system for single color fringe pattern

Abstract

The invention discloses a dynamic three-dimensional measurement method and system for a single color fringe pattern. The method comprises the following steps: S1, projecting three uniform red, green and blue intensity patterns with consistent intensity; shooting a projected uniform intensity pattern, and collecting red, green and blue uniform intensity patterns; S2, calculating a coupling strength coefficient between color channels; S3, projecting a color fringe pattern to the to-be-measured object and shooting the color fringe pattern; S4, decoupling gray fringe patterns of three channels in the color fringe pattern; S5, decomposing the decoupled color fringe pattern to obtain three background-free fringe patterns and three background patterns; S6, solving a modulation degree ratio by using the background image to obtain a color-normalized background-free fringe pattern; S7, demodulating the background-free fringe pattern after color normalization, and obtaining a demodulation phase; and S8, unwrapping the demodulation phase, solving an unwrapped phase, and reconstructing a three-dimensional shape. According to the method, three gray fringe patterns are coded on one color fringe pattern, and a gray phase shift fringe pattern meeting the demodulation requirement of a phase shift method is obtained through projection and decoupling.

Description

technical field [0001] The invention belongs to the technical field of optical three-dimensional measurement, and in particular relates to a dynamic three-dimensional measurement method and system for a single color fringe image. Background technique [0002] In recent decades, dynamic three-dimensional shape measurement technology has been widely used in various fields, such as industrial inspection, machine vision and intelligent monitoring. In order to realize the 3D shape measurement of dynamic objects, multi-camera stereo vision methods and fringe projection 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, so it has been widely developed and applied. Fringe projection profilometry mainly includes three processes: phase demodulation, phase unw...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the measurement speed and accuracy of the existing dynamic three-dimensional shape measurement technology are limited by the demodulation method, the purpose of the present invention is to propose a demodulation phase method and system with both speed and accuracy to meet the requirements of dynamic three-dimensional shape measurement. needs

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