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Motion Induced Phase Error Reduction Using a Filbert Transform

NCJ Number
254091
Date Published
2018
Length
12 pages
Author(s)
Y Wang; Z. Liu; C. Jiang; S. Zhang
Agencies
NIJ-Sponsored
Publication Type
Research (Applied/Empirical), Report (Study/Research), Report (Grant Sponsored), Program/Project Description
Grant Number(s)
2016-DN-BX-0189
Annotation
Since object motion can introduce phase error and thus measurement error for phase-shifting profilometry, this article reports on a project that proposes a generic motion error compensation method, based on the authors' finding that the dominant motion-introduced phase error doubles the frequency of the projected fringe frequency, and the Hilbert transform shifts the phase of a fringe pattern by n/2.
Abstract
A Hilbert transform was applied to phase-shifted fringe patterns to generate another set of fringe patterns, calculating one phase map using the original fringe patterns and another phase map using Hilbert transformed fringe patterns. The average of these two phase maps was then used for three-dimensional reconstruction. Both simulation and experiments demonstrated that the proposed method can substantially reduce motion-introduced measurement error. (publisher abstract modified)
Date Created: July 20, 2021