title: Selecting algorithms, sensors, and linear bases for optimum spectral recovery of skylight.
abstract: In a previous work [Appl. Opt.44, 5688 (2005)] we found the optimum sensors for a planned multispectral system for measuring skylight in the presence of noise by adapting a linear spectral recovery algorithm proposed by Maloney and Wandell [J. Opt. Soc. Am. A3, 29 (1986)]. Here we continue along these lines by simulating the responses of three to five Gaussian sensors and recovering spectral information from noise-affected sensor data by trying out four different estimation algorithms, three different sizes for the training set of spectra, and various linear bases. We attempt to find the optimum combination of sensors, recovery method, linear basis, and matrix size to recover the best skylight spectral power distributions from colorimetric and spectral (in the visible range) points of view. We show how all these parameters play an important role in the practical design of a real multispectral system and how to obtain several relevant conclusions from simulating the behavior of sensors in the presence of noise.
authors.affiliation: Departamento de Optica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain. migangel@ugr.es
authors.forename: Miguel A
authors.initials: MA
authors.lastname: López-Alvarez
authors.forename: Javier
authors.initials: J
authors.lastname: Hernández-Andrés
authors.forename: Eva M
authors.initials: EM
authors.lastname: Valero
authors.forename: Javier
authors.initials: J
authors.lastname: Romero
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D016247:Information Storage and Retrieval / Q000379:methods; D008029:Lighting; D016014:Linear Models; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000379:methods*; D013472:Sunlight; D014159:Transducers