Advances in Visual Computing

2021 ◽  
Keyword(s):  
Visual Computing

scholarly journals HIGH RESOLUTION 3D ACQUISITION AND MODELLING IN CULTURAL HERITAGE KNOWLEDGE AND RESTORATION PROJECTS: THE SURVEY OF THE FOUNTAIN OF NEPTUNE IN BOLOGNA

2019 ◽  
Vol XLII-2/W11 ◽  
pp. 573-578 ◽  
Author(s):  
V. A. Girelli ◽  
M. A. Tini ◽  
M. Dellapasqua ◽  
G. Bitelli
Keyword(s):  
Information System ◽  
Laser Scanning ◽  
3D Model ◽  
Ad Hoc ◽  
Complex Object ◽  
Visual Computing ◽  
Precision Level ◽  
3D Acquisition ◽  
The University ◽  
User Friendly

<p><strong>Abstract.</strong> In 2016, the Municipality of Bologna (Italy) has undertaken the restoration of one of the symbols of the entire city, the Fountain of Neptune, in evident state of degradation. The works have touched upon all the aspects of this complex object and the project has seen involved the Municipality and the University of Bologna, the Istituto Superiore per la Conservazione e il Restauro (ISCR) (Rome) and the Visual Computing Lab of the CNR – ISTI (Pisa), in a modern and highly multi-disciplinary approach.</p><p>One of the key elements of the project was made up by the creation of an information system ad hoc developed to permit, in an innovative, efficient and user-friendly way, the collection, sharing, management and analysis of all the information and data related to diagnostics and restoration actions. The base of the information system is a very detailed 3D model of the monument, realized by means of the most modern techniques for objects 3D modelling (laser scanning, digital photogrammetry and 3D scanning) integrated together with the aim to obtain a photo-textured 3D model characterized by a sub-millimetre precision level in the geometric description and a high perceptive fidelity of colour reproduction.</p><p>The surveying activities and data processing, performed by the DICAM Geomatics group of the University of Bologna (with the collaboration of the MCM Company of Rome), are described in the paper, with considerations on the problems encountered and the procedures and solutions adopted. The information system has been developed by CNR-ISTI.</p>

The Role of the Information Channel in Visual Computing

2020 ◽  
pp. 464-490
Author(s):  
Miquel Feixas ◽  
Mateu Sbert
Keyword(s):  
Information Theory ◽  
Communication Channel ◽  
Probability Distributions ◽  
Global Illumination ◽  
Three Dimensional ◽  
Information Channel ◽  
Visual Computing ◽  
The Social ◽  
Shared Information

Around seventy years ago, Claude Shannon, who was working at Bell Laboratories, introduced information theory with the main purpose of dealing with the communication channel between source and receiver. The communication channel, or information channel as it later became known, establishes the shared information between the source or input and the receiver or output, both of which are represented by random variables, that is, by probability distributions over their possible states. The generality and flexibility of the information channel concept can be robustly applied to numerous, different areas of science and technology, even the social sciences. In this chapter, we will present examples of its application to select the best viewpoints of an object, to segment an image, and to compute the global illumination of a three-dimensional virtual scene. We hope that our examples will illustrate how the practitioners of different disciplines can use it for the purpose of organizing and understanding the interplay of information between the corresponding source and receiver.

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