4 February 2013 On the spectral quality of scanner illumination with LEDs
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Abstract
Document scanner illumination has evolved along with general illumination technologies. LEDs have become more and more popular as the illumination sources for document scanning. LED technologies provide a wide range of choices both in terms of structural design and spectral compositions. In this report, we examine some popular LED technologies used for document scanner. We evaluate the color rendering performance of scanner models with different illumination technologies by examining their rendering of the Macbeth ColorChecker™ in sRGB. We found that more phosphors in phosphor conversion types of white LEDs may not be necessarily advantageous in terms of scanner color rendering performance. Also CIS type of scanner may be sensitive to the peak wavelength shift and can be particularly problematic when the peaks are out of certain range.
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Chengwu Cui, Chengwu Cui, } "On the spectral quality of scanner illumination with LEDs", Proc. SPIE 8653, Image Quality and System Performance X, 86530G (4 February 2013); doi: 10.1117/12.2006004; https://doi.org/10.1117/12.2006004
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