Open AccessOptical filter for highlighting spectral features Part I: design and development of the filter for discrimination of human skin with and without an application of cosmetic foundation
Author(s) -
Ken Nishino,
Mutsuko Nakamura,
Masayuki Matsumoto,
Osamu Tanno,
Shigeki Nakauchi
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.006020
Subject(s) - trichromacy , filter (signal processing) , object (grammar) , optics , computer vision , computer science , subspace topology , artificial intelligence , multispectral image , optical filter , spectral power distribution , face (sociological concept) , spectral sensitivity , physics , color vision , wavelength , social science , sociology
Light reflected from an object's surface contains much information about its physical and chemical properties. Changes in the physical properties of an object are barely detectable in spectra. Conventional trichromatic systems, on the other hand, cannot detect most spectral features because spectral information is compressively represented as trichromatic signals forming a three-dimensional subspace. We propose a method for designing a filter that optically modulates a camera's spectral sensitivity to find an alternative subspace highlighting an object's spectral features more effectively than the original trichromatic space. We designed and developed a filter that detects cosmetic foundations on human face. Results confirmed that the filter can visualize and nondestructively inspect the foundation distribution.