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Correcting Color-Measurement Error Caused by Stray Light in Image Scanners

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All optical systems suffer from stray light due to undesired reflections plus light scattering from surface imperfections, dust, other particles and similar causes. This unwanted light flux can cause serious errors in imaging colorimetry and densitometry. Although minimizing stray-light error has heretofore required complex and expensive optomechanical scanner designs, simpler designs are sometimes preferred because of cost, or for remote detection applications. In this paper, we show that a color error of ΔEL*a*b* = 10 or more is to be expected due to stray light alone in a simple imaging colorimeter, and that this error may easily be corrected with inexpensive signal processing technology. Line scanners, densitometers, imaging radiometers, and online web-product inspection scanners can also benefit substantially.
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Document Type: Research Article

Publication date: January 1, 1998

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  • CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. Participants represent disciplines ranging from psychophysics, optical physics, image processing, color science to graphic arts, systems engineering, and hardware and software development. While a broad mix of professional interests is the hallmark of these conferences, the focus is color. CICs traditionally offer two days of short courses followed by three days of technical sessions that include three keynotes, an evening lecture, a vibrant interactive (poster) papers session, and workshops. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper; there are also Best Paper and Best Student Paper awards.

    Please note: for Purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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