In vivo measurement of skin microrelief using photometric
stereo in the presence of interreflections

Sohaib, Ali; Farooq, Abdul; Atkinson, Gary; Smith, Lyndon; Smith, Melvyn; Warr, Robert

Abstract

This paper proposes and describes an implementation of a novel photometric stereo based technique for in vivo assessment of three-dimensional (3D) skin topography
in the presence of interreflections. The proposed method illuminates skin with red, green, and blue colored lights and uses the resulting variation in surface gradients to
mitigate the effects of interreflections. Experiments were carried out on Caucasian, Asian and African American subjects to demonstrate the accuracy of our method
and to validate the measurements produced by our system. Our method produced significant improvement in 3D surface reconstruction for all Caucasian, Asian and African American skin types. The results also illustrate the differences in recovered skin topography due to non-diffuse Bidirectional reflectance distribution function
(BRDF) for each color illumination used, which also concur with the existing multispectral BRDF data available for skin.

• Journal Article Type: Article
• Publication Date: Jan 1, 2013
• Deposit Date: Jan 22, 2013
• Publicly Available Date: Feb 25, 2016
• Journal: Journal of the Optical Society of America A
• Print ISSN: 1084-7529
• Publisher: Optical Society of America
• Peer Reviewed: Peer Reviewed
• Keywords: in vivo, skin microrelief, photometric stereo, interreflections
• Public URL: https://uwe-repository.worktribe.com/output/935882
• Contract Date: Feb 25, 2016