Abstract
Abstract. The spectral characteristic of the visible light reflected from any of archaeological artefact is the result of the interaction of its surface illuminated by incident light. Every particular surface depends on what material it is made of and/or which layers put on it has its spectral signature. Recent archaeometry recognises this information as very valuable data to extend present documentation of artefacts and as a new source for scientific exploration. However, the problem is having an appropriate hyperspectral imaging system available and adopted for applications in archaeology. In this paper, we present the new construction of the hyperspectral imaging system, made of industrial hyperspectral line scanner ImSpector V9 and CCD-sensor PixelView. The hyperspectral line scanner is calibrated geometrically, and hyperspectral data are geocoded and converted to the hyperspectral cube. The system abilities are evaluated for various archaeological artefacts made of different materials. Our experience in applications, visualisations, and interpretations of collected hyperspectral data are explored and presented.
Highlights
Hyperspectral images are defined as being recorded simultaneously in many, narrow, contiguous bands to provide information on the major features of the spectral reflectance of a given object
The images can be visualised as a 3-dimensional dataset with two spatial and one spectral dimension and the data set is often referred to as an image cube
Raw hyperspectral data are combined in an image cube with spatial, temporal and spectral dimension, after the imaging characteristic of the hyperspectral sensor, and they have to be transformed to geocoded hyperspectral cube for all further spatial analysis of hyperspectral data
Summary
Hyperspectral images are defined as being recorded simultaneously in many, narrow, contiguous bands to provide information on the major features of the spectral reflectance of a given object. Raw hyperspectral data are combined in an image cube with spatial, temporal and spectral dimension, after the imaging characteristic of the hyperspectral sensor (mostly push-broom scanner), and they have to be transformed to geocoded hyperspectral cube for all further spatial analysis of hyperspectral data. Because of imaging geometry of the hyperspectral sensor (push-broom scanner), only the parametric geocoding methods can be applied directly. Hyperspectral imaging is one of the most emerging archaeometric technology It brings a completely new set of information about artefacts, a complement to all other till documented by standard archaeometric procedures. Reflexiveness of the surface of archaeological artefact taken in many narrow spectral bands over a whole visible and near-IR spectrum is valuable information that characterises the surface on the way it is possible to recognise it among many others, for human sight the same, surfaces. That’s why the spectral reflexiveness is taken as spectral “signature” (Miljković, Gajski 2011)
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