Online 4d Reconstruction Using Multi-Images Available Under Open Access

Abstract

ABSTRACT:The advent of technology in digital cameras and their incorporation into virtually any smart mobile device has led to an explosion of the number of photographs taken every day. Today, the number of images stored online and available freely has reached unprecedented levels. It is estimated that in 2011, there were over 100 billion photographs stored in just one of the major social media sites. This number is growing exponentially. Moreover, advances in the fields of Photogrammetry and Computer Vision have led to significant breakthroughs such as the Structure from Motion algorithm which creates 3D models of objects using their twodimensional photographs. The existence of powerful and affordable computational machinery not only the reconstruction of complex structures but also entire cities. This paper illustrates an overview of our methodology for producing 3D models of Cultural Heritage structures such as monuments and artefacts from 2D data (pictures, video), available on Internet repositories, social media, Google Maps, Bing, etc. We also present new approaches to semantic enrichment of the end results and their subsequent export to Europeana, the European digital library, for integrated, interactive 3D visualisation within regular web browsers using WebGl and X3D. Our main goal is to enable historians, architects, archaeologists, urban planners and affiliated professionals to reconstruct views of historical structures from millions of images floating around the web and interact with them.

Across Space and Time

“…In these cases, the creation of the 3D model usually takes place via VR or CAD modelling (Koller et al 2006;Ioannides et al 2013). Technical workflows for the creation of these models displayed minimal variations for more than a decade (Begand 2004;Masuch 1999), but output quality and tools have undergone rapid change.…”

Reutilización de pares fotogramétricos de elementos arquitectónicos para la obtención de modelos 3D y ortofotografías a partir de técnicas SFM

“…Quizás uno de los casos que, por su repercusión, marcó un hito en el reaprovechamiento de fotografías convencionales antiguas fuese el modelado de los destruidos Budas de Bamiyan (Grün, Remondino y Zhang 2004), encontrando múltiples aplicaciones más recientes que se valen tanto de fotografías individuales como de fotogramas extraídos de grabaciones de vídeo (Angulo 2013; De Reu, Plets, Verhoeven, De Smedt, Bats, Cherretté, De Maeyer, Deconynck, Herremans, Laloo, Van Meirvenne y De Clercq 2013; Aparicio, Carmona, Fernández y Martín 2014; López-Romero 2014) y que incluso han cristalizado en proyectos que pretenden el aprovechamiento sistemático de las fotografías disponibles en la red (Ioannides, Hadjiprocopi, Doulamis, Doulamis, Protopapadakis, Makantasis, Santos, Fellner, Stork, Balet, Julien, Weinlinger, Johnson, Klein y Fritsch 2013). A modo de ejemplo, las siguientes figuras muestran dos modelos resultantes de procesar fotografías de turistas obtenidas de la web (figura 2) y de un vídeo (figura 3).…”

Historical Photogrammetry and Terrestrial Laser Scanning for the 3d Virtual Reconstruction of Destroyed Structures: A Case Study in Italy

“…The current technologies make possible also the virtual metric reconstruction of ancient structures; this digital product, referred to details and, sometimes, the entire buildings geometry, can be used to plan interventions, for architectural research, for the historical cataloguing, up to supporting a real anastylosis of the object. Considering that most of the world significant sites have been photographed under many different viewing conditions, the opportunities offered by photogrammetry are significantly enlarged by using non-metric images, available also on the Internet, especially nowadays thanks to the wide use of social networks that further facilitate sharing of amateur images (Gruen et al, 2004;Ioannides et al, 2013;Maiwald et al, 2017;Snavely, 2007).…”