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Proceedings Paper

Inspection of arterial-induced skin vibration by Moire fringe with two-dimensional continuous wavelet transform
Author(s): Chun-Hsiung Wang; Shih-Yung Chiu; Yu-Hsiang Hsu; Shu-Sheng Lee; Chih-Kung Lee
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Paper Abstract

A non-contact arterial-induced skin vibration inspection system is implemented. This optical metrology system is constructed with shadow Moiré configuration and the fringe analysis algorithm. Developed with the Region of Interested (ROI) capturing technique and the Two-dimensional Wavelet Transform (2D-CWT) method, this algorithm is able to retrieve the height-correlated phase information from the shadow Moiré fringe patterns. Using a commercial video camera or a CMOS image sensor, this system could monitor the skin-vibration induced by the cyclic deformation of inner layered artery. The cross-sectional variation and the rhythm of heart cycle could be continuously measured for health monitoring purposes. The average vibration amplitude of the artery at the wrist ranges between 20 μm and 50 μm, which is quite subtle comparing with the skin surface structure. Having the non-stationary motion of human body, the traditional phase shifting (PS) technique can be very unstable due to the requirement of several frames of images, especially for case that artery is continuously pumping. To bypass this fundamental issue, the shadow Moiré technique is introduced to enhance the surface deformation characteristic. And the phase information is retrieved by the means of spectrum filtering instead of PS technique, which the phase is calculated from intensity maps of multiple images. The instantaneous surface can therefore be reconstructed individually from each frame, enabling the subtle arterial-induced skin vibration measurement. The comparative results of phase reconstruction between different fringe analysis algorithms will be demonstrated numerically and experimentally. And the electrocardiography (ECG) results will used as the reference for the validity of health monitoring potential of the non-contact arterial-induced skin vibration inspection system.

Paper Details

Date Published: 26 June 2017
PDF: 8 pages
Proc. SPIE 10333, Optical Methods for Inspection, Characterization, and Imaging of Biomaterials III, 1033305 (26 June 2017); doi: 10.1117/12.2270106
Show Author Affiliations
Chun-Hsiung Wang, National Taiwan Univ. (Taiwan)
Shih-Yung Chiu, National Taiwan Univ. (Taiwan)
Yu-Hsiang Hsu, National Taiwan Univ. (Taiwan)
Shu-Sheng Lee, National Taiwan Ocean Univ. (Taiwan)
Chih-Kung Lee, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 10333:
Optical Methods for Inspection, Characterization, and Imaging of Biomaterials III
Pietro Ferraro; Simonetta Grilli; Monika Ritsch-Marte; Christoph K. Hitzenberger, Editor(s)

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