Face Finder: Filtering a Large Face Database Using Scars, Marks and Tattoos
Facial marks (e.g. moles, freckles, and scars) are soft biometric traits that have limited utility in uniquely identifying individuals. However, facial marks can still play a crucial role both in filtering a large face gallery, as well as in distinguishing between ambiguous face comparisons such as identical twins. This paper demonstrates that facial marks can indeed be used to speed up face matching and assist in individualizing identical twins. The facial mark detection process consists of two main stages: landmark detection using Active Shape Model (ASM) to represent face images in a common coordinate system, and a scale space extrema detection method to detect facial marks.