Measurement of surface form of Johannesteijsmania altifrons leaf using phase-shift fringe projection

► Fringe projection method was used to measure the surface form of a folded leaf. ► The proposed method was verified using a zigzag object in the shape of the leaf. ► The optical method enables measurement with a maximum error of 7.5%. ► The 3-D surface data can be used to model folded structures in...

Full description

Saved in:
Bibliographic Details
Published in:Measurement : journal of the International Measurement Confederation 2013-02, Vol.46 (2), p.855-865
Main Authors: Bharathi, S., Ratnam, M.M., Choong, K.K.
Format: Article
Language:English
Subjects:
3-D surface form
Algorithms
CCD cameras
Contact
Deformation
Fringe projection
Leaf
Phase-shift
Projection
Structural design
Thin walled
Three dimensional
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:► Fringe projection method was used to measure the surface form of a folded leaf. ► The proposed method was verified using a zigzag object in the shape of the leaf. ► The optical method enables measurement with a maximum error of 7.5%. ► The 3-D surface data can be used to model folded structures in nature. The design of thin-walled structures based on naturally occurring folded structures, such as the Johannesteijsmania altifrons leaf, is relatively unexplored. The main advantage of this particular type of folded leaf is that it is supported by a single main stem, which can be exploited in structural designs if the 3-D surface form is known. Since the leaf can deform if the surface form is measured using conventional contact methods, the non-contact phase-shifting fringe projection method was applied to determine the 3-D surface form of the leaf. The potential of the phase-shifting fringe projection method for reconstructing the 3-D surface of naturally occurring folded structures such as J. altifrons leaf has not been attempted in the past. The objective of this work is to investigate the potential of using this technique to measure the 3-D surface of the life folded leaf in its natural environment. Three fringe patterns were projected onto the leaf with phase-shifts of 0,2π/3 and 4π/3, captured using a CCD camera and processed to obtain a phase map. The 3-D data of the leaf surface were successfully reconstructed from the phase map using a phase-unwrapping algorithm.
ISSN:0263-2241
1873-412X
DOI:10.1016/j.measurement.2012.10.009