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Reliability and Validity of Image-Based and Self-Reported Skin Phenotype Metrics

2021-06-18 16:12:24
John J. Howard, Yevgeniy B. Sirotin, Jerry L. Tipton, Arun R. Vemury

Abstract

With increasing adoption of face recognition systems, it is important to ensure adequate performance of these technologies across demographic groups. Recently, phenotypes such as skin-tone, have been proposed as superior alternatives to traditional race categories when exploring performance differentials. However, there is little consensus regarding how to appropriately measure skin-tone in evaluations of biometric performance or in AI more broadly. In this study, we explore the relationship between face-area-lightness-measures (FALMs) estimated from images and ground-truth skin readings collected using a device designed to measure human skin. FALMs estimated from different images of the same individual varied significantly relative to ground-truth FALM. This variation was only reduced by greater control of acquisition (camera, background, and environment). Next, we compare ground-truth FALM to Fitzpatrick Skin Types (FST) categories obtained using the standard, in-person, medical survey and show FST is poorly predictive of skin-tone. Finally, we show how noisy estimation of FALM leads to errors selecting explanatory factors for demographic differentials. These results demonstrate that measures of skin-tone for biometric performance evaluations must come from objective, characterized, and controlled sources. Further, despite this being a currently practiced approach, estimating FST categories and FALMs from uncontrolled imagery does not provide an appropriate measure of skin-tone.

Abstract (translated)

URL

https://arxiv.org/abs/2106.11240

PDF

https://arxiv.org/pdf/2106.11240.pdf


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