1,721,052 research outputs found
Il disegno anatomico di Leonardo al tempo del Salvator Mundi / The Leonardo's Anatomical Drawing at the Time of Salvator Mundi
No full textThe volume includes essays and entries on Leonardo's anatomical drawings in relation to the Salvator Mundi painting kept in a Saudi Arabian collection. P.Marani is the author of one essay, three entries and, moreover, he is co-author of the Introduction and of another essay in collaboration with R.Barsanti and M.Gaian
SHAFT (SAT & HUE Adaptive Fine Tuning), a new automated solution for target-based color correction
No full textTarget-based 'color correction' is today a popular technique to have a faithful reproduction of color in many field where the digital photography is used: portraiture, fashion, furniture design, interior design and Cultural Heritage (CH). This technique, establishing the color relationship according to a set of color patches with available pre-measured spectral or colorimetric data, allows to have color corrected images using a limited set of parameters and subtle variation of color according with well-defined effects.
Following a growing success, essentially due to its flexibility and easy to use, in the last years several color correction target-based solutions appeared both commercial and open source. These solutions follows basically two different methods to calculate the transformation between measured CIEXYZ values and captured RGB values: linear transformations, or least-squares polynomial regressions.
In many cases, a simple linear transformation is sufficient to map device-dependent and device-independent spaces with adequate performance. Linear approaches are extensively employed for 'color correction' as they preserve two key properties directly related to the camera sensors linear response to the light sources: scalability and hue planes. Despite above listed benefits, linear correction may produce significant errors.
To allow better estimations an efficient option is the polynomial color correction. For fixed calibration settings, a polynomial regression can strongly reduce the mapping error allowing significant improvements to color correction. However, the use of high degree data expansions can result in unstable (rank deficient). Another major problem in the use of the polynomial regression consists in its not scale-independent feature (i.e., data scaled as result of changes in the scene radiance or exposure). This shift can be significant in several cases and this is a significant problem in outdoor captured images.
A third solution, could be found in the Adobe Camera Raw (ACR) calibration scripts coming from Bruce Fraser's calibration procedure for successive approximations. This accurate solution, however presents the problem to be completely grounded on the Adobe Photoshop software and a further problem consisting in the stop of the development in 2010.
In this paper we present a new ACR-like solution completely written in MATLAB able to be used alone or coupled with a polynomial regression, introducing several optimizations and enhancement to the original algorithm. The so-named new SHAFT differs from the original technique for the number and types of tests done along the processing and for the algorithm used to find the best variation from the original values of the selected parameters (exposure, contrast, white balance, hue and saturation on each RGB channel).
Tests of the new solution in many field related to the CH and typical problems of each class of algorithms are illustrated showing surprising results
Palladio in 3D
No full textObiettivo della ricerca è stata l'analisi di alcune metodologie di intervento su modelli digitali di Andrea Palladio in modo da poter configurare una sperimentazione scientifica nell'ambito della rappresentazione dell'architettura. In particolare sono stati presentati alcuni risultati di applicazioni tecniche per la visualizzazione di progetti palladiani attraverso le nuove tecnologie, fino all'esplorazione con proiettori stereoscopici 3D per la resa virtuale verosimile di un progetto
A TECHNIQUE FOR URBAN COLOR MAPPING STARTING FROM THE CASE STUDY OF MARCO ZANUSO'S COLLEGIO DI MILANO
Full text linkIn pursuit of a more objective approach to efficiently support the urban color design, the aim of this study is the introduction of a multiscale approach to the urban space color analysis. The paper opens with the presentation of a robust method, based on scales of perception, then it analyses the urban color at different scales, and it deepens into color corrected images. Specific features, problems and solutions are then illustrated. The Collegio di Milano complex, designed by the famous architect Marco Zanuso, was selected as a case study to prove the methodology's effectiveness on a real complex placed into a wider urban area. As a final outcome the methodology introduced proved how urban color mapping is a versatile process where the main role is played by multi-scale presence of color perception and material
Reshaping the Coliseum in Rome: an integrated data capture and modeling at heritage sites
No full textEurographics 200
Forma e colore del Colosseo. Sperimentazioni di rilievi tridimensionali e indagini colorimetriche per il restauro e la conservazione
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