Applications of low-cost 3D imaging techniques for the documentation of heritage objects

3D image recording has reached an increasing impact on the field of cultural heritage. Applications include documentation of the state of conservation and dimensions of an object, the archaeological survey of artefacts, the dissemination of museum collections and sites, and packaging designing, among others. The 3D image acquisition techniques most commonly used are laser or structured light scanning and, increasingly, close range digital photogrammetry. In this work a 3D digitization case-study is presented in order to explore the advantages and possibilities of close range digital photogrammetry respect to scanning techniques in documentation of heritage objects. Free and low-cost software used by these techniques were tested and the quality of the results obtained in each case is analyzed. The potentiality of close range digital photogrammetry to enhance the resolution of the 3D recording is also discussed.Fil: Morita, María Mercedes. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Ópticas. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones Ópticas. Universidad Nacional de La Plata. Centro de Investigaciones Ópticas; ArgentinaFil: Bilmes, Gabriel Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Ópticas. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones Ópticas. Universidad Nacional de La Plata. Centro de Investigaciones Ópticas; Argentin

Aplicaciones de técnicas de imágenes 3D de bajo costo para documentación de bienes culturales

3D image recording has reached an increasing impact on the field of cultural heritage. Applications include documentation of the state of conservation and dimensions of an object, the archaeological survey of artefacts, the dissemination of museum collections and sites, and packaging designing, among others. The 3D image acquisition techniques most commonly used are laser or structured light scanning and, increasingly, close range digital photogrammetry. In this work a 3D digitization case-study is presented in order to explore the advantages and possibilities of close range digital photogrammetry respect to scanning techniques in documentation of heritage objects. Free and low-cost software used by these techniques were tested and the quality of the results obtained in each case is analyzed. The potentiality of close range digital photogrammetry to enhance the resolution of the 3D recording is also discussed.El registro de imágenes 3D ha tenido un impacto creciente en el campo de los bienes culturales. Las aplicaciones incluyen la documentación del estado de conservación y de las dimensiones de un objeto, el estudio arqueológico de artefactos, la difusión de las colecciones de museos y sitios y el diseño de embalaje, entre otros. Las técnicas de adquisición de imágenes 3D comúnmente más usadas son el escaneo con láser y con luz estructurada y, cada vez más, la fotogrametría digital de objeto cercano. En este trabajo, se presenta un estudio de caso de digitalización 3D para explorar las ventajas y posibilidades de la fotogrametría digital de objeto cercano respecto a las técnicas de escaneo en documentación de bienes culturales. Se probaron software gratuitos y de bajo costo y se analizó la calidad de los resultados obtenidos en cada caso. También se discute la potencialidad de la fotogrametría digital de objeto cercano para optimizar la resolución.Centro de Investigaciones Óptica

Aplicaciones de técnicas de imágenes 3D de bajo costo para documentación de bienes culturales

3D image recording has reached an increasing impact on the field of cultural heritage. Applications include documentation of the state of conservation and dimensions of an object, the archaeological survey of artefacts, the dissemination of museum collections and sites, and packaging designing, among others. The 3D image acquisition techniques most commonly used are laser or structured light scanning and, increasingly, close range digital photogrammetry. In this work a 3D digitization case-study is presented in order to explore the advantages and possibilities of close range digital photogrammetry respect to scanning techniques in documentation of heritage objects. Free and low-cost software used by these techniques were tested and the quality of the results obtained in each case is analyzed. The potentiality of close range digital photogrammetry to enhance the resolution of the 3D recording is also discussed.El registro de imágenes 3D ha tenido un impacto creciente en el campo de los bienes culturales. Las aplicaciones incluyen la documentación del estado de conservación y de las dimensiones de un objeto, el estudio arqueológico de artefactos, la difusión de las colecciones de museos y sitios y el diseño de embalaje, entre otros. Las técnicas de adquisición de imágenes 3D comúnmente más usadas son el escaneo con láser y con luz estructurada y, cada vez más, la fotogrametría digital de objeto cercano. En este trabajo, se presenta un estudio de caso de digitalización 3D para explorar las ventajas y posibilidades de la fotogrametría digital de objeto cercano respecto a las técnicas de escaneo en documentación de bienes culturales. Se probaron software gratuitos y de bajo costo y se analizó la calidad de los resultados obtenidos en cada caso. También se discute la potencialidad de la fotogrametría digital de objeto cercano para optimizar la resolución.Centro de Investigaciones Óptica

Aplicaciones de técnicas de imágenes 3D de bajo costo para documentación de bienes culturales

3D image recording has reached an increasing impact on the field of cultural heritage. Applications include documentation of the state of conservation and dimensions of an object, the archaeological survey of artefacts, the dissemination of museum collections and sites, and packaging designing, among others. The 3D image acquisition techniques most commonly used are laser or structured light scanning and, increasingly, close range digital photogrammetry. In this work a 3D digitization case-study is presented in order to explore the advantages and possibilities of close range digital photogrammetry respect to scanning techniques in documentation of heritage objects. Free and low-cost software used by these techniques were tested and the quality of the results obtained in each case is analyzed. The potentiality of close range digital photogrammetry to enhance the resolution of the 3D recording is also discussed.El registro de imágenes 3D ha tenido un impacto creciente en el campo de los bienes culturales. Las aplicaciones incluyen la documentación del estado de conservación y de las dimensiones de un objeto, el estudio arqueológico de artefactos, la difusión de las colecciones de museos y sitios y el diseño de embalaje, entre otros. Las técnicas de adquisición de imágenes 3D comúnmente más usadas son el escaneo con láser y con luz estructurada y, cada vez más, la fotogrametría digital de objeto cercano. En este trabajo, se presenta un estudio de caso de digitalización 3D para explorar las ventajas y posibilidades de la fotogrametría digital de objeto cercano respecto a las técnicas de escaneo en documentación de bienes culturales. Se probaron software gratuitos y de bajo costo y se analizó la calidad de los resultados obtenidos en cada caso. También se discute la potencialidad de la fotogrametría digital de objeto cercano para optimizar la resolución.Centro de Investigaciones Óptica

Does HDR pre-processing improve the accuracy of 3D models obtained by means of two conventional SfM-MVS software packages? the case of the corral del veleta rock glacier

La precisión de los diferentes flujos de trabajo usando la estructura del Movimiento y técnicas estéreo vista múltiple (SfM-MVS) está probado. Nubes de doce puntos del Corral del Veleta glaciar de roca, en España, se produjeron con dos diferentes paquetes de software (123D Catch y Agisoft Photoscan), utilizando imágenes de bajo rango dinámico y composiciones de alto rango dinámico (HDR) para tres años distintos (2011, 2012 y 2014). La exactitud de las nubes de puntos resultante se evaluó mediante modelos de referencia adquiridos cada año con un escáner láser terrestre. Tres parámetros se utilizaron para estimar la precisión de cada nube de puntos: el RMSE, la nube-a-nube distancia (C2C) y la Multiscale-Model a comparación de modelos (M3C2). El M3C2 el error promedio varió de 0,084 m (desviación estándar de 0,403 m) a 1.451 m (desviación estándar de 1.625 m). Agisoft Photoscan superar 123D Catch, produciendo más precisas y densas nubes de puntos en 11 de 12 casos, siendo este trabajo, la primera comparación entre ambos paquetes de software en la literatura. Ninguna mejora significativa fue observada a través de HDR de pre-procesamiento. A nuestro conocimiento, esta es la primera vez que la exactitud geométrica de modelos 3D obtenidos utilizando LDR y HDR composiciones son comparados. Estos hallazgos pueden ser de interés para los investigadores que deseen para estimar los cambios geomórficas con SfM-MVS enfoques.The accuracy of different workflows using Structure-from-Motion and Multi-View-Stereo techniques (SfM-MVS) is tested. Twelve point clouds of the Corral del Veleta rock glacier, in Spain, were produced with two different software packages (123D Catch and Agisoft Photoscan), using Low Dynamic Range images and High Dynamic Range compositions (HDR) for three different years (2011, 2012 and 2014). The accuracy of the resulting point clouds was assessed using benchmark models acquired every year with a Terrestrial Laser Scanner. Three parameters were used to estimate the accuracy of each point cloud: the RMSE, the Cloud-to-Cloud distance (C2C) and the Multiscale-Model-to-Model comparison (M3C2). The M3C2 mean error ranged from 0.084 m (standard deviation of 0.403 m) to 1.451 m (standard deviation of 1.625 m). Agisoft Photoscan overcome 123D Catch, producing more accurate and denser point clouds in 11 out 12 cases, being this work, the first available comparison between both software packages in the literature. No significant improvement was observed using HDR pre-processing. To our knowledge, this is the first time that the geometrical accuracy of 3D models obtained using LDR and HDR compositions are compared. These findings may be of interest for researchers who wish to estimate geomorphic changes using SfM-MVS approaches.peerReviewe

Estimating Damaged Volume of Historic Pagodas in Bagan after Earthquake using 3D Hough Transform

On 24th August 2016, the magnitude of a 6.8 earthquake struck in Bagan from the depth of 52 miles. This earthquake caused much damage in historic pagodas in Bagan, one of the archeological houses in Asia. Analyzing the affected areas is an essential task for the restoration and reconstruction of historic buildings after a disaster. Traditional methods of detecting damage to buildings focus on detecting 2D changes (i.e., only the appearance of the image), but the 2D information provided by the image is not sufficient when it involves detecting damage to buildings is often not precise. For finding out the solution, a method of 3D change detection is needed for estimating the volumes of damaged pagodas after the earthquake. The proposed system aims at producing a quick assessment of the damaged pagodas accurately and correctly. This system estimates the damaged volume of the pagoda based on the nature of the 3D point clouds. Post-earthquake photos are taken using an anonymous aircraft (UAV) and point cloud data is generated using VisualSFM software. The 3D Hough transform is used to find the intersection of the tower vertex and the 3D vertex at the line boundary. Besides, the proposed system can detect the reformed structure of the entire pagoda. The results show that the proposed approach facilitates the automated 3D detection of damaged pagodas and is a time-saving method for estimating the volume of damage caused to precious historic pagodas after a disaster

A FULLY AUTOMATED INCREMENTAL PHOTOGRAMMETRIC PROCESSING DEDICATED FOR COLLABORATIVE REMOTE-COMPUTING WORKFLOW

Image based-modeling practices in the field of Cultural Heritage studies are nowadays no longer seen as one-shot applications but as various and complex multimodal scenarios. Current use of SFM and photogrammetric methods implies their extensions to facilitate the management of complex multimodal data sets carried-out by different experts around a single heritage asset. In order to fully benefit of collaborative semantic enrichment of spatially oriented resources, a versatile and robust solution have been developed to enable incremental registration of image-sets within the web-based platform AIOLI. For this purpose, this paper will present an on-going development of a Totally Automated Co-registration and Orientations (TACO) work-flow

3D Recording and Interpretation for Maritime Archaeology

This open access peer-reviewed volume was inspired by the UNESCO UNITWIN Network for Underwater Archaeology International Workshop held at Flinders University, Adelaide, Australia in November 2016. Content is based on, but not limited to, the work presented at the workshop which was dedicated to 3D recording and interpretation for maritime archaeology. The volume consists of contributions from leading international experts as well as up-and-coming early career researchers from around the globe. The content of the book includes recording and analysis of maritime archaeology through emerging technologies, including both practical and theoretical contributions. Topics include photogrammetric recording, laser scanning, marine geophysical 3D survey techniques, virtual reality, 3D modelling and reconstruction, data integration and Geographic Information Systems. The principal incentive for this publication is the ongoing rapid shift in the methodologies of maritime archaeology within recent years and a marked increase in the use of 3D and digital approaches. This convergence of digital technologies such as underwater photography and photogrammetry, 3D sonar, 3D virtual reality, and 3D printing has highlighted a pressing need for these new methodologies to be considered together, both in terms of defining the state-of-the-art and for consideration of future directions. As a scholarly publication, the audience for the book includes students and researchers, as well as professionals working in various aspects of archaeology, heritage management, education, museums, and public policy. It will be of special interest to those working in the field of coastal cultural resource management and underwater archaeology but will also be of broader interest to anyone interested in archaeology and to those in other disciplines who are now engaging with 3D recording and visualization