Search results for "SCANNER"
showing 10 items of 170 documents
Colorimetric Characterization of a Positive Film Scanner Using an Extremely Reduced Training Data Set
2011
International audience; In this work, we address the problem of having an accurate colorimetric characterization of a scanner for traditional posi- tive film in order to guarantee the accuracy of the color informa- tion during the digitization of a movie. The scanning of a posi- tive film is not an usual task, however it can happen for cultural heritage purpose. Art-movies, are often created and stored as positive-film in museums. One of the problems one can face for a colorimetric characterization is to have a reasonable number of measurements from an item. In this work we succeeded in having a reasonable accuracy with just a few number of measurement (typically 4 to 7 ∆Ea∗b units with 2 t…
Robust technique for 3D shape reconstruction
2017
Abstract In this paper a robust and simple scheme is presented for three dimensional (3D) shape reconstruction of real object. A novel composite pattern technique is proposed for projecting the light pattern on the object of interest. The proposed scheme reduces the number of patterns by combining the primary color coded channels into one composite format. Our approach uses both spatial and temporal intensity variation for calibration and construction phase. Gamma calibration is considered with the propose scheme. High quality depth map is obtained from the linear light reflected by the shape of object without complex calculations. Experimental results demonstrated that proposed technique i…
Un “laboratorio” di conoscenza nel Mediterraneo. Il Castello Utveggio a Palermo.
2009
Il presente studio approfondisce le tematiche, su esposte, ponendo l’attenzione sull’edificio storico “Il Grande Albergo Castello Utveggio”, che - per scelta di luogo e di destinazione d’uso, eccezionale per avvenimenti tecnici e costruttivi finalizzati a realizzarlo - presenta caratteristiche peculiari di identità di luogo fortemente correlato con la città di Palermo, con il paesaggio della Conca d’Oro e con il territorio. Posto sulla sommità del Primo Pizzo nel settore meridionale del Monte Pellegrino a 346 m s.l.m., è rivolto verso la città e il porto, fu progettato dall’architetto Giovan Battista Santangelo e realizzato nei primi decenni del ‘900.
Rilievo integrato per la conoscenza e documentazione del complesso termale dell'area archeologica di Tindari (ME)
2018
The aim of this study is to survey the Roman baths integrated in the so-called Insula IV of the archaeological area of Tindari (ME) for a better understanding of the site and for its enhancement. It is a structure that represents one of the oldest and best preserved thermal buildings with retrograde path in Sicily. Taking into account the typological, structural and decorative peculiarities that characterize the site, it was necessary to operate through integrated digital survey methods (laser scanning and SFM), obtaining a 3D model which describes the building in its entirety. The thermal building was inserted in the first century AD in a residential block dating back to the Hellenistic pe…
Integration of large-area optical imagers for biometric recognition and touch in displays
2021
In recent years there has been an increasing interest to integrate optical sensing in mobile displays, for instance, for biometric fingerprint scanning functionality. There are several routes to incorporate optical fingerprint functionality within the full display area, each with their own benefits and challenges. Here we investigate the different integration routes using large-area, ultra-thin imagers based on organic photodiodes.
Geomatic applications tourban park in palermo
2015
Over the last few years topographical techniques have developed an exponential trend towards simplifying and speeding, both survey operations and analysis of data collected reaching at the same time ever higher levels of accuracy. Among the technologies that are increasingly taking the field in this context is part of the Mobile Mapping System (MMS) that, on any mobile platform, combines sensors and measurement systems designed to provide a 3D position of the platform and, at the same time, capable to acquire geographic data without the aid of control points on the ground. The study reported concerns the verification of the reliability metrics and a qualitative MMS in order to evaluate its …
Analisi e comparazione di modelli di superficie di reperti archeologici realizzati tramite laser scanner e fotogrammetria
2009
La ricerca svolta si è posta come obiettivo quello di verificare l’accuratezza di modelli di superficie (Digital Surface Model – DSM) di reperti archeologici realizzati attraverso procedure fotogrammetriche. La sperimentazione è stata condotta su alcuni reperti, già oggetto di studio in precedenti ricerche, conservati presso il museo Archeologico Regionale di Palermo. In questo lavoro vengono presentati i primi risultati relativi al rilievo della metopa di “Europa rapita dal Toro”. I DSM, generati con due differenti software di fotogrammetria, sono stati messi a confronto con il DSM ottenuto con un laser scanner a triangolazione ottica. Tale modello è stato considerato come riferimento per …
A Scan-to-BIM Approach for the Management of Two Arab-Norman Churches in Palermo (Italy)
2023
The paper shows the results of the research activities carried out by the Department of Engineering at the University of Palermo (Italy), which assessed the application of the Heritage Building Information Modelling (HBIM) methodology through a Scan-to-BIM approach to two local churches belonging to the medieval period. This project was motivated by a renewed interest from the city administrators towards the conservation of cultural heritage dating back to the Arab-Norman domination in Sicily since one of the two buildings was included in the UNESCO World Heritage Sites list in 2015. The morpho-typological style of the churches has been acquired by high-detailed 3D surveys, which provided t…
Digital Correlation Method Based on Micro-geometrical Texture Pattern for Strain Field Measurement
2011
International audience; Image correlation methods are widely used in experimental mechanics to obtain displacement field measurements. Currently, these methods are applied using digital images of the initial and deformed surfaces sprayed with black or white paint. Speckle patterns are then captured and the correlation is performed with a high degree of accuracy to an order of 0.01 pixels. In 3D, however, stereo-correlation leads to a lower degree of accuracy. Correlation techniques are based on the search for a sub-image (or pattern) displacement field. The work presented in this paper introduces a new correlation-based approach for 3D displacement field measurement that uses an additional …
Rilievi e indagini diagnostiche non distruttive per l’individuazione delle cripte - La Cattedrale di Ragusa
2014
I diversi operatori, che si occupano di Beni Storici e Culturali, si avvalgono sempre più spesso delle soluzioni tecnologiche avanzate offerte dalla moderna Geomatica, facendo ricorso ad integrazioni delle sue discipline, per meglio studiare, indagare e monitorare un bene di interesse storico. Oggi si tentano nuove integrazioni con altre discipline che, tradizionalmente, non riguardano il campo del rilievo propriamente detto. Questo è, ad esempio, il caso dello studio condotto sulla Cattedrale di San Giovanni a Ragusa, nel quale si è partiti dal rilievo laser scanning di una porzione della chiesa e del suo pregiatissimo pavimento, sotto il quale secondo uno schizzo dei primi anni del XIX se…