title: Spectral sharpening of color sensors: diagonal color constancy and beyond.
abstract: It has now been 20 years since the seminal work by Finlayson et al. on the use of spectral sharpening of sensors to achieve diagonal color constancy. Spectral sharpening is still used today by numerous researchers for different goals unrelated to the original goal of diagonal color constancy e.g., multispectral processing, shadow removal, location of unique hues. This paper reviews the idea of spectral sharpening through the lens of what is known today in color constancy, describes the different methods used for obtaining a set of sharpening sensors and presents an overview of the many different uses that have been found for spectral sharpening over the years.
authors.affiliation: Information and Communications Technologies Department, Universitat Pompeu Fabra, Roc Boronat 138, Barcelona 08018, Spain. javier.vazquez@upf.edu.
authors.forename: Javier
authors.initials: J
authors.lastname: Vazquez-Corral
authors.affiliation: Information and Communications Technologies Department, Universitat Pompeu Fabra, Roc Boronat 138, Barcelona 08018, Spain. marcelo.bertalmio@upf.edu.
authors.forename: Marcelo
authors.initials: M
authors.lastname: Bertalmío
mesh_terms: D003116:Color; D055095:Optics and Photonics / Q000295:instrumentation*; D013057:Spectrum Analysis / Q000295:instrumentation*