Choosing Optimal Wavelengths for Colour Laser Scanners

摘要

Multiple sets of measured reflectance data were analysed torndetermine the combination of three laser wavelengths that wouldrnminimise the mean colorimetric difference between the laserrnillumination and D65. The optimum wavelengths for blue, greenrnand red lasers were found to be in the ranges 450-460, 530-540rnand 595-605 nm, close to Thornton’s ‘prime wavelengths ofrnvision’. These optima were independent of both samples andrncolour difference metrics. The results were compared with therncolorimetric performance of a commercial 3D colour laserrnscanner, in which the laser wavelengths are 473, 532 and 635 nm.rnIt was found that two additional laser wavelengths would have tornbe added to the scanner to achieve a degree of colorimetricrnaccuracy similar to the optimum three laser wavelengths. Therneffects on colour image rendering of the actual vs optimalrnwavelengths were demonstrated on a hyperspectral image.