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Proceedings Paper

Development of a 3D clinical facial imager
Author(s): Stephen J. Marshall; R. C. Rixon; Don N. Whiteford; J. T. Cumming; Peter J. Wells; S. J. Powell
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Paper Abstract

A collaborative project between NEL and St George's Hospital to investigate the measurement of the human face has resulted in the development of a 3-D clinical facial imager. The system utilizes the projection moire fringe contouring method developed at NEL to acquire accurate 3-D coordinates from the surface of a patient's face. In order that data can be obtained from the full facial area, two moire measuring units are employed, positioned symmetrically to each side of the face. The phase-stepping technique is used to improve the accuracy of interpolation between fringe centers and to distinguish automatically between surface concavity and convexity. Digitization and analysis of the resulting fringe patterns is performed using CCD cameras linked to a PC-hosted transputer image processing board which also controls the operation of the measuring units. Output is in the form of a dense mesh of 3-D coordinates which are transferred to a graphics workstation for image display, manipulation, and interrogation using specially developed software. A detailed description of the facial imager is given, with particular emphasis on the design features and two-stage calibration method which ensure that the inherent accuracy of the data acquisition technique is realized and facilitate the reliable measurement of unrestrained patients.

Paper Details

Date Published: 3 September 1993
PDF: 8 pages
Proc. SPIE 1889, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine III, (3 September 1993); doi: 10.1117/12.155720
Show Author Affiliations
Stephen J. Marshall, National Engineering Lab. (United Kingdom)
R. C. Rixon, National Engineering Lab. (United Kingdom)
Don N. Whiteford, National Engineering Lab. (United Kingdom)
J. T. Cumming, National Engineering Lab. (United Kingdom)
Peter J. Wells, St. George's Hospital (United Kingdom)
S. J. Powell, St. George's Hospital (United Kingdom)

Published in SPIE Proceedings Vol. 1889:
Holography, Interferometry, and Optical Pattern Recognition in Biomedicine III
Halina Podbielska M.D., Editor(s)

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