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The Revealing Flashlight: Interactive Spatial Augmented Reality for Detail Exploration of Cultural Heritage Artifacts

Published: 01 June 2014 Publication History

Abstract

Cultural heritage artifacts often contain details that are difficult to distinguish due to aging effects such as erosion. We propose the revealing flashlight, a new interaction and visualization technique in spatial augmented reality that helps to reveal the detail of such artifacts. We locally and interactively augment a physical artifact by projecting an expressive 3D visualization that highlights its features, based on an analysis of its previously acquired geometry at multiple scales. Our novel interaction technique simulates and improves the behavior of a flashlight: according to 6-degree-of-freedom input, we adjust the numerous parameters involved in the expressive visualization—in addition to specifying the location to be augmented. This makes advanced 3D analysis accessible to the greater public with an everyday gesture, by naturally combining the inspection of the real object and the virtual object in a colocated interaction and visualization space.
The revealing flashlight can be used by archeologists, for example, to help decipher inscriptions in eroded stones, or by museums to let visitors interactively discover the geometric details and meta-information of cultural artifacts. We confirm its effectiveness, ease of use, and ease of learning in an initial preliminary user study and by the feedback of two public exhibitions.

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      Anselm Grundhöfer

      For most people today, the term augmented reality (AR) is directly linked to cell-phone-based video augmentation applications. However, it should not be forgotten that other AR systems exist that augment the real world directly, such as projection-based spatial AR applications. Using well-established algorithms from computer vision and image processing, those systems can be used for various applications. The authors of this paper present the revealing flashlight, which is a novel visual interaction tool based on projection-based spatial augmented reality. This not only has the potential to enhance the attractiveness of cultural heritage artifacts, but can also be used as an inspection tool for archaeologists. Compared to similar methods, the presented approach offers electromagnetic and optical, finger-based interaction techniques and uses a pre-scanned, registered high-resolution geometry to generate the visual augmentations in a convincing fashion. Online Computing Reviews Service

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      Published In

      cover image Journal on Computing and Cultural Heritage
      Journal on Computing and Cultural Heritage   Volume 7, Issue 2
      Special Issue on Interacting with the Past
      July 2014
      160 pages
      ISSN:1556-4673
      EISSN:1556-4711
      DOI:10.1145/2635823
      Issue’s Table of Contents
      Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than the author(s) must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected].

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      Association for Computing Machinery

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      Publication History

      Published: 01 June 2014
      Accepted: 01 February 2014
      Revised: 01 November 2013
      Received: 01 July 2013
      Published in JOCCH Volume 7, Issue 2

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      Author Tags

      1. Spatial interaction techniques
      2. expressive visualization
      3. spatial augmented reality
      4. tangible interaction

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