Spectral Estimation of Fluorescent Objects Using Visible Lights and an Imaging Device

摘要

A method is proposed for estimating the spectral radiancernfactor of fluorescent objects by using visible lights and an imagingrndevice. We use neither an ultraviolet light (black light) nor arnmonochromator, but use an easy imaging system consisting of arnmulti-band camera and two ordinary visible light sources. Thernimaging system can provide fluorescent characteristics at everyrnpixel of an object surface. The camera outputs are modeled usingrnthe Donaldson matrix with the two factors of reflected radiancernand luminescent radiance. An algorithm is then presented forrnestimating both radiance factors from two sets of spectral imagesrnof the camera outputs, captured under two light sources. Thisrnsolution method is based on use of two sets of observations underrnthe known illuminant spectra to obtain two unknown components.rnThe feasibility of the proposed method is examined in experimentsrnusing fluorescent paints in detail. The light sources of anrnincandescent lamp and an artificial sun lamp are selected as a setrnof suitable light sources. The accuracy of the estimated radiancernfactors is confirmed.