Search

In recent years, Augmented Reality (AR) technology has experienced considerable progress and the combination of AR and 3D modeling opens up new opportunities regarding 3D data visualization and interaction. Consequently, the dissemination of cultural heritage can benefit from these technologies in order to display the cultural assets as realistically and interactively as possible. In this way, high-accuracy 3D models are integrated in the real world.Nevertheless, progress has also still been limited due to several factors. The paper presents a case study based on the recreation of the Queen Victoria sculpture in an AR application. Furthermore, the environment of the sculpture is simulated by panoramic images, inside the Library of Parliament in Ottawa, Canada. The main problems for the development of an AR smartphone application from panoramic images and photogrammetric 3D data are described in this paper. The characteristics of AR systems are explained in detail, analyzing all the steps involved and the available solutions considered.

The use of photogrammetry and terrestrial laser scanning for building information modelling (BIM) in the documentation and conservation of Cultural Heritage (CH) is now well established. By combining BIM with the latest visualization technologies, powerful, semi-immersive experiences can be developed to enhance the dissemination of CH. In semi-immersive experiences such as Augmented Reality (AR), digital content can be overlapped on to physical spaces, providing a new way to interact with both the physical space and the digital content. This paper discusses the translation of a digital object created using BIM, into a physical object and the utilisation of this physical object as a trigger for an AR experience. The case study looks at one of the neo- Gothic window frames from the House of Commons in the Centre Block of the Parliament Hill National Historic Site, in Ottawa, Canada. The window frame is one in a series that represents a Canadian province or territory with a stained glass feature that includes floral emblems and heraldic symbols from the respective provincial or territorial shield. The frame in this case study corresponds to the stained glass window of five provinces. Using the replica frame as a target, the user can select which stained glass windows they would like to view in the AR application. Through these combined technologies, we argue that CH can be revealed in a more interactive way and therefore more engaging manner – making even inaccessible architectural details readily available to the public.

[EN] Prehistoric rock art paintings, specifically rock-shelters exposed to environmental and anthropogenic factors, are usually faint and severely damaged, being them difficult to identify and understand by visitors. Augmented Reality (AR) supplements reality with virtual information superimposed onto the real world. This sensor-based technology in smartphones/tablets can improve the paintings experience displaying the 2D digital tracings overlapped onto the real scene (rock with faint paintings). This paper presents an AR application (app) developed in Cova dels Cavalls that shows a recreation of a possible original composition full of motifs with descriptive information to improve current guided tour user experiences. This case study aims to evaluate the rock art AR app targeting non-expert visitors as a means of improving rock art knowledge and sensibility of a fragile archaeological UNESCO Work Heritage site. To achieve this, a variety of participants with different backgrounds and interests tested the AR app on site and answered a complete questionnaire about the use of AR mobile apps. Overall, the results showed great acceptance of this AR app, mainly because in addition to adding new information interactively, it helps to identify the rock art motifs, as well as to recognise them quickly, improving their understanding., The authors gratefully acknowledge the support from the Spanish Ministerio de Economia y Competitividad to the project HAR201459873-R. The authors acknowledge the authorisation of the Conselleria d'Educacio, Investigacio, Cultura i Esports the chance to carry out research at this exceptional archaeological site.

Many human, technical, and economic resources are devoted nowadays to document cultural heritage. Nevertheless, the resources are limited and heritage in general is suffering not only from anthropogenic and natural disasters but also from varying physical and chemical conditions. This paper summarizes a wide range of recording and documentation activities carried out at the Petra Archaeological Park, in particular, at Djinn Block No. 9 to improve the level of understanding of that iconic monument. The recording and documentation considered a wide range of metric and multispectral techniques such as close-range photogrammetry, terrestrial laser scanning, multispectral photography, thermography, and remote sensing to build up scientific knowledge of the monument prior to undertaking conservation and preservation measures. The conventional 3D documentation with visible colors was accompanied by layers of multispectral information that were used to inspect and monitor the deterioration of the monument, as a step to take the right conservation and preservation initiatives. Besides the scientific documentation and conservation, dissemination is considered as a vital part of any survey to raise awareness to the society (both local and foreigners, even visitors) about its wellness (even if it is very much deteriorated). The dissemination is implemented for mobile devices (apps for mobile phones and tablets) to integrate different layers of information: 3D, history, multispectral imagery, geo-localization, geo-services, and last but not least cyber-archaeology to visualize fully textured ideal 3D reconstructions of the past periods on multiple platforms. A critical view of the different steps ranging from data acquisition, processing (geometry and spectral content), and post-processing to deliver cyber-archaeological products will be analyzed.

[EN] Augmented Reality (AR) applications have experienced extraordinary growth recently, evolving into a well-established method for the dissemination and communication of content related to cultural heritage¿including education. AR applications have been used in museums and gallery exhibitions and virtual reconstructions of historic interiors. However, the circumstances of an outdoor environment can be problematic. This paper presents a methodology to develop immersive AR applications based on the recognition of outdoor buildings. To demonstrate this methodology, a case study focused on the Parliament Buildings National Historic Site in Ottawa, Canada has been conducted. The site is currently undergoing a multiyear rehabilitation program that will make access to parts of this national monument inaccessible to the public. AR experiences, including simulated photo merging of historic and present content, are proposed as one tool that can enrich the Parliament Hill visit during the rehabilitation. Outdoor AR experiences are limited by factors, such as variable lighting (and shadows) conditions, caused by changes in the environment (objects height and orientation, obstructions, occlusions), the weather, and the time of day. This paper proposes a workflow to solve some of these issues from a multi-image tracking approach., This work has been developed under the framework of the New Paradigms/New Tools for Heritage Conservation in Canada, a project funded through the Social Sciences and Humanities Research Council of Canada (SSHRC).

[EN] Non-destructive rock art recording techniques are getting special attention in the last years, opening new research lines in order to improve the level of documentation and understanding of our rich legacy. This paper applies the principal component analysis (PCA) technique in images that include wavelengths between 400-700 nm (visible range). Our approach is focused on determining the difference provided by the image processing of the visible region through four spectral images versus an image that encompasses the entire visible spectrum. The images were taken by means of optical filters that take specific wavelengths and exclude parts of the spectrum. Simulation of rock art is prepared in laboratory. For this purpose, three different pigments were made simulating the material composition of rock art paintings. The advantages of studying the visible spectrum in separate images are analysed. In addition, PCA is applied to each of the images to reduce redundant data. Finally, PCA is applied to the image that contains the entire visible spectrum and is compared with previous results. Through the results of the four visible spectral images one can begin to draw conclusions about constituent painting materials without using decorrelation techniques., [ES] Las técnicas documentación no destructivas de arte rupestre están recibiendo especial atención en los últimos años, abriendo nuevas líneas de investigación para la mejora del nivel de documentación y comprensión de nuestro patrimonio. Este artículo aplica la técnica de análisis de componentes principales (ACP) en imágenes de longitudes de onda entre 400-700 nm (rango visible). Nuestro enfoque se centra en determinar las diferencias proporcionadas por el procesamiento de imágenes de la región del visible a través de cuatro imágenes espectrales y una imagen que abarca el espectro visible completo. Las imágenes se tomaron con filtros ópticos que recogen longitudes de onda determinadas y excluyen parte del espectro.Se preparó una simulación de pigmentos de arte ruprestre en laboratorio. Para ello se hicieron tres tipos de pigmentos diferentes simulando la composición del material de las pinturas rupestres. Se analizaron las ventajas de estudiar el espectro visible en imágenes separadas. Además, se aplicó ACP a cada una de las imágenes para reducir la información redundante. Finalmente, se realizó ACP a la imagen que abarca todo el espectro visible y se comparó con los resultados anteriores. A través de los resultados de las cuatro imágenes espectrales del visible se pueden sacar conclusiones sobre los materiales que constituyen la pintura sin aplicar técnicas de decorrelación.