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Choosing Optimal Wavelengths for Colour Laser Scanners

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Multiple sets of measured reflectance data were analysed to determine the combination of three laser wavelengths that would minimise the mean colorimetric difference between the laser illumination and D65. The optimum wavelengths for blue, green and red lasers were found to be in the ranges 450-460, 530-540 and 595-605 nm, close to Thornton's ‘prime wavelengths of vision’. These optima were independent of both samples and colour difference metrics. The results were compared with the colorimetric performance of a commercial 3D colour laser scanner, in which the laser wavelengths are 473, 532 and 635 nm. It was found that two additional laser wavelengths would have to be added to the scanner to achieve a degree of colorimetric accuracy similar to the optimum three laser wavelengths. The effects on colour image rendering of the actual vs optimal wavelengths were demonstrated on a hyperspectral image.

Document Type: Research Article

Publication date: January 1, 2011

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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, and a vibrant interactive papers session. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper presentation.

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