@techreport{Imai2002_1,
        Abstract = {This report provides a comparative study of the spectral and colorimetric accuracy of various transformations from multi-band digital signals to spectral reflectance. The multiband channels were obtained by multi-channel visible-spectral imaging (MVSI) using a monochrome CCD and two different filtering systems. In the first system we used a liquid-crystal tunable filter (LCTF) capturing 31 narrow-band channels. We also used a filter wheel with a set of 6 glass filters imaging with and without an extra Wratten absorption filter giving a total of 12 channels. Four different mathematical methods were tested to derive reflectance spectra from digital signals: pseudo-inverse, eigenvector analysis, modified-discrete sine transformation (MDST) and non-negative least squares (NNLS). We also considered two different approaches to sampling the digital signals; in one approach we averaged the digital counts.},
        Address = {Rochester, New York, United States},
        Author = {Francisco H. Imai and Lawrence A. Taplin and Ellen A. Day},
        Institution = {Rochester Institute of Technology, College of Science, Center for Imaging Science,Munsell Color Science Laboratory},
        Keywords = {Art-Si-Dual RGB Image Capture; Art-SI},
        Month = {},
        Number = {},
        Title = {Comparison of the accuracy of various transformations from multi-band images to reflectance spectra},
        Url = {http://art-si.org/PDFs/Art-SI_Summer2002.pdf},
        Year = {2002}}