A super-grayscale and real-time computer-generated Moiré profilometry using video grating projection

Abstract By using the time-division multiplexing characteristics of the projector and the integral exposure characteristics of the charge coupled device (CCD) camera, a super-grayscale and real-time computer-generated Moiré profilometry based on video grating projection is proposed. The traditional...

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Autores principales:	Hongmei Li, Yiping Cao, Yingying Wan, Chengmeng Li, Cai Xu, Hechen Zhang, Haihua An
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/44b78a1470104333931b162ef87aab68
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spelling	oai:doaj.org-article:44b78a1470104333931b162ef87aab682021-12-02T18:09:03ZA super-grayscale and real-time computer-generated Moiré profilometry using video grating projection10.1038/s41598-021-99420-82045-2322https://doaj.org/article/44b78a1470104333931b162ef87aab682021-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-99420-8https://doaj.org/toc/2045-2322Abstract By using the time-division multiplexing characteristics of the projector and the integral exposure characteristics of the charge coupled device (CCD) camera, a super-grayscale and real-time computer-generated Moiré profilometry based on video grating projection is proposed. The traditional digital static grating is of 256-grayscale at most. If an expected super-grayscale grating with a maximum grayscale of 766 is designed and divided into three 256-grayscale fringe patterns with balanced grayscale as far as possible, they can be synthesized into a repeated playing video grating instead of the traditional static grating. When the video grating is projected onto the measured object, as long as the exposure time is set to three times the refresh cycle of the video grating, the super-grayscale deformed patterns in the 766-grayscale can be captured with a 10-bit CCD camera, so that the deformed patterns are realistic. The digital error in computer-generated Moiré profilometry is effectively reduced. In addition, this method can expand the linear range of the deformed pattern by 20% in computer Moiré profilometry. Therefore, the proposed method has the perspectives of high accuracy and real-time measurement. Theoretical analysis and experimental results demonstrate the validity and capability of the proposed method.Hongmei LiYiping CaoYingying WanChengmeng LiCai XuHechen ZhangHaihua AnNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hongmei Li Yiping Cao Yingying Wan Chengmeng Li Cai Xu Hechen Zhang Haihua An A super-grayscale and real-time computer-generated Moiré profilometry using video grating projection
description	Abstract By using the time-division multiplexing characteristics of the projector and the integral exposure characteristics of the charge coupled device (CCD) camera, a super-grayscale and real-time computer-generated Moiré profilometry based on video grating projection is proposed. The traditional digital static grating is of 256-grayscale at most. If an expected super-grayscale grating with a maximum grayscale of 766 is designed and divided into three 256-grayscale fringe patterns with balanced grayscale as far as possible, they can be synthesized into a repeated playing video grating instead of the traditional static grating. When the video grating is projected onto the measured object, as long as the exposure time is set to three times the refresh cycle of the video grating, the super-grayscale deformed patterns in the 766-grayscale can be captured with a 10-bit CCD camera, so that the deformed patterns are realistic. The digital error in computer-generated Moiré profilometry is effectively reduced. In addition, this method can expand the linear range of the deformed pattern by 20% in computer Moiré profilometry. Therefore, the proposed method has the perspectives of high accuracy and real-time measurement. Theoretical analysis and experimental results demonstrate the validity and capability of the proposed method.
format	article
author	Hongmei Li Yiping Cao Yingying Wan Chengmeng Li Cai Xu Hechen Zhang Haihua An
author_facet	Hongmei Li Yiping Cao Yingying Wan Chengmeng Li Cai Xu Hechen Zhang Haihua An
author_sort	Hongmei Li
title	A super-grayscale and real-time computer-generated Moiré profilometry using video grating projection
title_short	A super-grayscale and real-time computer-generated Moiré profilometry using video grating projection
title_full	A super-grayscale and real-time computer-generated Moiré profilometry using video grating projection
title_fullStr	A super-grayscale and real-time computer-generated Moiré profilometry using video grating projection
title_full_unstemmed	A super-grayscale and real-time computer-generated Moiré profilometry using video grating projection
title_sort	super-grayscale and real-time computer-generated moiré profilometry using video grating projection
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/44b78a1470104333931b162ef87aab68
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A super-grayscale and real-time computer-generated Moiré profilometry using video grating projection

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