Hyperspectral imaging is a chemical imaging technique based on reflectance spectroscopy (the light reflected by materials). The principle of hyper spectral imaging is based on the collection of a large number of images in contiguous spectral bands. This sequence of images provides a huge set of data that is called a file cube or image cube in which each spot is identified by two spatial coordinates, x and y identifying a pixel of the sample surface, and a spectral coordinate, the wavelength of the band. This device makes the collection of reflectance spectra in each point of the field of view for the visible range (it is complementary to another device for the Near infrared range). The Visible range includes the electronic transitions of some inorganic and organic pigments and dyes that can be spatially resolved in a few minutes by the acquisition of a reflection image cube.
Fields of application
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Cultural heritage
archaeological object and site, architecture, art, decorative arts, manuscript, musical instrument, painting, papyrus, photo, sculpture, textile
Materials
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inorganic
dyes, pigment
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organic
dyes
TOOLS
Measurements are performed using a SOC710 hyperspectral camera produced by Surface Optics Corporation, San Diego (USA). The system utilizes a whiskbroom line scanner producing a 696x520 pixels hypercube covering the range of 400-1000 nm with 128 spectral bands. The spectra are defined by one point approximately every 4.5 nm. The spatial resolution can be continuously...