1,721,047 research outputs found
SUPER-RESOLUTION IMAGES ON MOBILE SMARTPHONE AIMED AT 3D MODELING
Full text linkIn these last years have been calculated several general algorithms to process the images acquired by mobile devices. Nevertheless, they don't always work at their full effectiveness due the numerous constraints and external issues. The latest generation smartphones, pushed by higher user expectations, have increasingly performing camera functions, in particular way, about the always increasing resolution, with a large number of pixels to process or two cameras for stereo view. Considering that pixels in an image sensor synthetizes the number of incoming photons, taking a photograph with a digital camera means to applying a low-pass filter to a scene where the tiny textures, such as characters that measure a few pixels, are observed blurry. This happens when using digital zoom or when the visibility is compromised or during the night artificial lights. For all these reasons the conventional image converter resolution algorithms (as bilinear interpolation algorithm) don't work with the high-frequency information of a scene once lost. All these aspects are more relevant if we are taking photos to carry out a 3D scenario. Indeed, the 3D model will have an higher geometric accuracy if the image resolution will be higher. Super-Resolution algorithms (SRa) are classified into two categories: (1) approaches that reconstruct a high-resolution image from itself and (2) approaches that register multiple low-resolution images to interpolate sub-pixel information. In this paper we verify the geometric accuracy of a 3D model, when using the Morpho Super-ResolutionTM algorithm, also in critical condition. This algorithm doesn't require pixel shift, indeed, some cameras have a functionality named pixel shift, which captures multiple images while shifting the image sensor
Smart Monitoring of Civil Infrastructures
No full textIn this presentation, I will show a case study of smart monitoring applied on pavement road
to detect the distresses and verify the real state of life of the infrastructures. The methodology
used is based on the photogrammetric technique that allow us to carry out a 3D model that
has the follow features: low cost process, low time process, user friendly, repeatability. These
features consent to make a planning with frequently acquisition to guarantee a reliability
monitoring. It works with the comparison between the dense clouds of the 3D models acquired
in different moment: the mean square distance between the dense clouds shows where there
has been a new distress or an increasing of an old distress. The study identifies low-cost
but accurate strategies and techniques to collect road condition data mainly using simple and
readily available devices such as smartphones and drone
Crowd sourcing and low cost strategies of survey for documentation and analysis of museum collections
No full textIn these last years, there has been an increasing use of the
Structure from Motion (SfM) techniques applied to Cultural
Heritage. The accessibility of SfM software can be especially
advantageous to users in non-technical fields or to those
with limited resources. Thanks to SfM using, everyone can
make with a digital camera a 3D model applied to an object
of both Cultural Heritage, and physically Environment, and
work arts, etc. One very interesting and useful application
can be envisioned into museum collection digitalization.
In the last years, a social experiment has been conducted
involving young generation to live a social museum using
their own camera to take pictures and videos. Students
of university of Catania and Palermo were involved into
a national event #digitalinvasion (2015-2016 editions)
offering their personal contribution: they realized 3D models
of the museums collection through the SfM techniques. In
particular at the National Archaeological Museum Salinas
in Palermo, it has been conducted an organized survey to
recognize the most important part of the archaeological
collection. It was a success: in both #digitalinvasion National
Event 2015 and 2016 the young students of Engineering
classes carried out, with Photoscan Agisoft, more than
one hundred 3D models some of which realized by phone
camera and some other by reflex camera and some other
with compact camera too. The director of the museum has
been very impressed from these results and now we are
going to collaborate at a National project to use the young
generation crowdsourcing to realize a semi-automated
monitoring system at Salinas Archaeological Museum
Architectural perspectives in the cathedral of Palermo : image-based modeling for cultural heritage understanding and enhancement
Full text linkPalermo off ers a repertoire of both artistic
and architectural solid perspective of great beauty and
in large quantity. This paper addresses the problem of
the 3D survey of these works and their related study
through the use of image-based modelling (IBM) techniques.
We propose, as case studies, the use of IBM
techniques inside the Cathedral of Palermo. Indeed, the
church houses a huge and rich sculptural repertoire, dating
back to 16th century, which constitutes a valid field
of IBM techniques application.
The aim of this study is to demonstrate the e ffectiveness
and potentiality of these techniques for geometric
analysis of sculptured works. Indeed, usually the survey
of these artworks is very diffi cult due the geometric complexity,
typical of sculptured elements. In this study,
we analysed cylindrical and planar geometries as well as
carrying out an application of perspective return.peer-reviewe
3d image based modelling using google earth imagery for 3d landscape modelling
No full textIn recent years SfM technique experiments have been innumerable and increasingly refined under metric profiles. The techniques rely on photographic datasets of the objects or landscapes which can require in most cases time consuming and expensive surveys. Recently however there have been increases in the available 3D data of sites worldwide on the Google Earth (GE) platform. This paper presents a unique experimentation that considers integrating readily available datasets from GE and images taken during surveys on ground level for 3D replication without the use of expensive aerial surveys. This will enable practitioners the ability to more easily create 3D models of cultural heritage significance. This paper utilizes the methodology using a church with cultural and architectural significance to the city of Palermo: Santa Caterina D’Alessandria d’Egitto. It aims at verifying the process’ reliability using three chunks of data on the same object; 2 from Ground level cameras and one from GE
3D MODELING of A COMPLEX BUILDING: From MULTI-VIEW IMAGE FUSION to GOOGLE EARTH PUBLICATION
Full text linkThis paper presents a pipeline that aims at illustrating the procedure to realize a 3D model of a complex building integrating the UAV and terrestrial images and modifying the 3D model in order to publish to Google Earth in an interactive modality so as to provide better available models for visualization and use. The main steps of the procedure are the optimization of the UAV flight, the integration of the different UAV and ground floor images and the optimization of the model to be published to GE. The case study has been identified in a building, The Eremo di Santa Rosalia Convent in Sicily which hash more staggered elevations and located in the hills of the hinterland and of which, the online platform only indicate the position on Google Maps (GM) and Google Earth (GE) with a photo from above and a non-urban road whose GM path is not corresponding with the GE photo. The process highlights the integration of the models and showcases a workflow for the publication of the combined 3D model to the GE platform
A GAMING APPROACH for CULTURAL HERITAGE KNOWLEDGE and DISSEMINATION
Full text linkIn these last years, video games have become one of the most popular entertainment for children/teenagers/adults thanks to their appealing and seductive features and, in this context, the Serious Games (SG) have become an important research field. The most popular SGs in Cultural Heritage (CH) used the historical building like scenario where the game is playing. In this paper we show the procedure to achieve a CH video game where the Cultural Heritage is the main actor and not the scenario of the game. Furthermore, the game is not a SG but an Action-Adventure Game (AAG) or Survival Game (SuG), in a largest heading it can be classified as Entertainment Games (EGs). The novelty of this study is not only in the original application of the CH within the AAG sector but also consists of the experimentation of the Virtual Reality (VR) algorithm and of the application of Augmented Reality (AR) within the VR scenario used in the form of an avatar. Furthermore, in this paper we overcome the technical problems due to the different size of the environment and the work art
#InvasioniDigitali3D: un'esperienza di crowdsourcing per la digitalizzazione museale
No full textLo STUDIO PROPONE UNA METODOLOGIA DI CROWDSOURC!NG PER LA DIGITALIZZAZIONE MUSEALE, SPERIMENTATA NELL'AMBITO DELLE #lNVASIONIDIGlTALI, UN PROGETTO INNOVATIVO NELLA COMUNICAZIONE E DISSEMINAZIONE CULTURALE DIGITALE , INCLUSIVA E PARTECIPATA. DURANTE L'EVENTO DELLE INVASIONI SONO STATI REALIZZATI I MODELLI TRIDIMENSIONALI (TECNICHE
SFM) DELLE COLLEZIONI O DI PARTI ARCHITETTONICHE DI ALCUNI SITI ATTRAVERSO IL CONTRIBUTO DELLE NUOVE GENERAZIONI (STUDENTI UNIVERSITARI). L'OBIETTIVO È QUELLO DIMOSTRARE CHE IL VISITATORE PUÒ DIVENTARE IL CO-CREATORE DELLA DIGITALIZZAZIONE MUSEALE
Photogrammetric UAV technologies aimed at monitoring of infrastructures
No full textThe research has three key concept: the first one is the application of data analysis using limited
data sets to understand historical and future road maintenance interventions; the second one
is the application of image based 3D modelling and analysis of pavement distresses; the third
one is the application of deep learning to detect and pinpoint pavement distresse
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