1,720,961 research outputs found
Tristimulus space transformations and luminance-coefficient computation in RGB colour mixing
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Spectrophotometric Scanner for Imaging of Paintings and Other Works of Art
No full textA spectrophotometric scanner has been assembled
for applications concerning the conservation of paintings
and of other works of art with plane surface. Its optical
components, that are a lens, a spectrometer and a
monochrome matrix CCD digital camera, are arranged in
axial configuration.
A frame of the camera allows the image acquisition
of a strip of the scene collecting the reflectance spectra of
its pixels. The full image is saved as ordered collection of
the reflectance spectra of subsequent strips.
The scanner needs only optical geometrical
alignment and the usual wavelength calibration.
Evaluation of the fidelity of the color reproduction gives
very good results. Measurements of the scanner contrast
transfer function (CTF) has been carried out for the
estimation of its spatial resolution
Dalla macchina fotografica allo scanner ottico spettrofotometrico per la spettroscopia d’immagine nei beni artistici e culturali
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Scanner spettrofotometrico per la digitalizzazione di quadri e altre opere d'arte di superficie piana
No full textProposta di una stazione a camera digitale e sfera d'integrazione per la misurazione del colore
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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