EUROGRAPHICS Workshop on Graphics and Cultural Heritage - Short and Project Papers 2014

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https://diglib.eg.org/handle/10.2312/7751

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Browsing EUROGRAPHICS Workshop on Graphics and Cultural Heritage - Short and Project Papers 2014 by Subject "Digitizing and Scanning"

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    Cloud-based 3D Reconstruction of Cultural Heritage Monuments using Open Access Image Repositories
    (The Eurographics Association, 2014) Hadjiprocopis, Andreas; Wenzel, Konrad; Rothermel, Mathias; Ioannides, Marinos; Fritsch, Dieter; Klein, Michael; Johnsons, Paul S.; Weinlinger, Guenther; Doulamis, Anastasios; Protopapadakis, Eftychios; Kyriakaki, Georgia; Makantasis, Kostas; Fellner, Dieter W.; Stork, Andre; Santos, Pedro; Reinhard Klein and Pedro Santos
    A large number of photographs of cultural heritage items and monuments is publicly available in various Open Access Image Repositories (OAIR) and social media sites. Metadata inserted by camera, user and host site may help to determine the photograph content, geo-location and date of capture, thus allowing us, with relative success, to localise photos in space and time. Additionally, developments in Photogrammetry and Computer Vision, such as Structure from Motion (SfM), provide a simple and cost-effective method of generating relatively accurate camera orientations and sparse and dense 3D point clouds from 2D images. Our main goal is to provide a software tool able to run on desktop or cluster computers or as a back end of a cloud-based service, enabling historians, architects, archaeologists and the general public to search, download and reconstruct 3D point clouds of historical monuments from hundreds of images from the web in a cost-effective manner. The end products can be further enriched with metadata and published. This paper describes a workflow for searching and retrieving photographs of historical monuments from OAIR, such as Flickr and Picasa, and using them to build dense point clouds using SfM and dense image matching techniques. Computational efficiency is improved by a technique which reduces image matching time by using an image connectivity prior derived from low-resolution versions of the original images. Benchmarks for two large datasets showing the respective efficiency gains are presented.
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    Community-driven Generation of 3D and Augmented Web Content for Archaeology
    (The Eurographics Association, 2014) Ritsos, Panagiotis D.; Wilson, Andrew T.; Miles, Helen C.; Williams, Lee F.; Tiddeman, Bernard; Labrosse, Frédéric; Griffiths, Seren; Edwards, Ben; Möller, Katharina; Karl, Raimund; Roberts, Jonathan C.; Reinhard Klein and Pedro Santos
    Heritage sites (such as prehistoric burial cairns and standing stones) are prolific in Europe; although there is a wish to scan each of these sites, it would be time-consuming to achieve. Citizen science approaches enable us to involve the public to perform a metric survey by capturing images. In this paper, discussing work-in progress, we present our automatic process that takes the user's uploaded photographs, converts them into 3D models and displays them in two presentation platforms - in a web gallery application, using X3D/X3DOM, and in mobile augmented reality, using awe.js.