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Colour gamut expansion with spectral imaging

Papathanasiou Athanasios

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Summary

Latest developments in hyperspectral imaging devices, such as operational speed, size, accuracy and convenient use, has led to a broader range of applications involving such technologies. Colour reproduction is a critical procedure since colour is used in a wide big variety of applications in order to communicate information. Colour capturing is the first and propablyprobably most crucial step in colour pipeline procedures. In order to achieve good performance on colour processing and rendering, consistent primary raw data are required. In this thesis, the colour capturing capabilities of image acquisition devices are discussed and evaluated. By performing experiments based on standardisedsed methods we were able to compare the amount of digital colour inputs to the total chromaticities an average person sees. A spectral-based solution modification has beenis proposed for benefit improving the conventional colour capturing systems such as trichromatic colour cameras. This modification setup achieves higher scores, in terms of shape matching and common area coverage, of the transformed camera colour space versus the standarised human colour space. AlsoMoreover, Aa new procedure for calculating hyperspectral imager’s colour gamut has also been proposed. By using this method, it is possible to measure a hyperspectral device colour spacethe colour space of a hyperspectral device and optimise it in order to match perfectly the human-observable colour space. Finally, the results presented here made clear the dominance of the hyperspectral imaging procedure -as opposed to the conventional colour cameras- in capturing and interconnecting colour.

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