Colored digital Moire technique for self-occluding shading  in fringe projection profilometry

Flores Nuñez, Jorge Luis; Ordoñes, Sotero; Parra Escamilla, Geliztle Alejandra

doi:10.1117/12.2682672

Colored digital Moire technique for self-occluding shading in fringe projection profilometry

Journal

Infrared Remote Sensing and Instrumentation XXXI

Date Issued

2023

Author(s)

Flores Nuñez, Jorge Luis

Ordoñes, Sotero

Parra Escamilla, Geliztle Alejandra

Facultad de Ingeniería - CampGDL

Type

text::conference output::conference proceedings::conference paper

DOI

10.1117/12.2682672

URL

https://scripta.up.edu.mx/handle/20.500.12552/9910

Abstract

In this work, we presented a phase demodulation technique for fringe analysis in fringe projection profilometry based on digital moiré and the co-phase technique. The approach involves the use of stereo illumination and the simultaneous projection and acquisition of two π-shifted sinusoidal patterns from each projector. By taking advantage of color multiplexing, we code the sinusoidal patterns in the red and blue channels of the RGB images, so we need to project and acquire one image for each digital light projector. The phase demodulation consists of two steps: first, digitally generating the moiré pattern for each RGB image utilizing the spatial phase carrier; second, computing the analytic signals for the two moiré patterns via a third-order, low-pass Butterworth filter in the frequency domain; third, calculate the final phase by merging the two analytic signals using the co-phasing technique.