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Journal of Biomedical Optics • Open Access

Determination of optimal view angles for quantitative facial image analysis
Author(s): Byungjo Jung; Bernard Choi; Yongjin Shin; Anthony Joseph Durkin; John Stuart Nelson

Paper Abstract

In quantitative evaluation of facial skin chromophore content using color imaging, several factors such as view angle and facial curvature affect the accuracy of measured values. To determine the influence of view angle and facial curvature on the accuracy of quantitative image analysis, we acquire cross-polarized diffuse reflectance color images of a white-patched mannequin head model and human subjects while varying the angular position of the head with respect to the image acquisition system. With the mannequin head model, the coefficient of variance (CV) is determined to specify an optimal view angle resulting in a relatively uniform light distribution on the region of interest (ROI). Our results indicate that view angle and facial curvature influence the accuracy of the recorded color information and quantitative image analysis. Moreover, there exists an optimal view angle that minimizes the artifacts in color determination resulting from facial curvature. In a specific ROI, the CV is less in smaller regions than in larger regions, and in relatively flat regions. In clinical application, our results suggest that view angle affects the quantitative assessment of port wine stain (PWS) skin erythema, emphasizing the importance of using the optimal view angle to minimize artifacts caused by nonuniform light distribution on the ROI. From these results, we propose that optimal view angles can be identified using the mannequin head model to image specific regions of interest on the face of human subjects.

Paper Details

Date Published: 1 March 2005
PDF: 7 pages
J. Biomed. Opt. 10(2) 024002 doi: 10.1117/1.1895987
Published in: Journal of Biomedical Optics Volume 10, Issue 2
Show Author Affiliations
Byungjo Jung, Univ. of California/Irvine (United States)
Bernard Choi, Univ. of California/Irvine (United States)
Yongjin Shin, Chosun Univ. (South Korea)
Anthony Joseph Durkin, Univ. of California/Irvine (United States)
John Stuart Nelson, Univ. of California/Irvine (United States)

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