2017 |
Kouimtzoglou, T; Stathopoulou, E K; Agrafiotis, P; Georgopoulos, A Image-based 3D reconstruction data as an analysis and documentation tool for architects: The case of Plaka bridge in Greece Journal Article In: Int. Arch. Photogramm. Remote Sens. Spat. Inf. Sci. - ISPRS Arch., vol. 42, no. 2W3, pp. 391–397, 2017, ISSN: 16821750. Abstract | Links | BibTeX | Tags: Architecture, Cultural heritage, Image-based 3D reconstruction, Photogrammetry @article{Kouimtzoglou2017,Modern advances in the field of image-based 3D reconstruction of complex architectures are valuable tools that may offer the researchers great possibilities integrating the use of such procedures in their studies. In the same way that photogrammetry was a well-known useful tool among the cultural heritage community for years, the state of the art reconstruction techniques generate complete and easy to use 3D data, thus enabling engineers, architects and other cultural heritage experts to approach their case studies in an exhaustive and efficient way. The generated data can be a valuable and accurate basis upon which further plans and studies will be drafted. These and other aspects of the use of image-based 3D data for architectural studies are to be presented and analysed in this paper, based on the experience gained from a specific case study, the Plaka Bridge. This historic structure is of particular interest, as it was recently lost due to extreme weather conditions and serves as a strong proof that preventive actions are of utmost importance in order to preserve our common past. |
Georgopoulos, Andreas; Stathopoulou, Elisavet Konstantina Data Acquisition for 3D Geometric Recording: State of the Art and Recent Innovations Book Section In: Vincent, Matthew L.; ópez-Menchero Bendicho, Víctor Manuel L; Ioannides, Marinos; Levy, Thomas E. (Ed.): Herit. Archaeol. Digit. Age Acquis. Curation, Dissem. Spat. Cult. Herit. Data, pp. 1–26, Springer International Publishing, Cham, 2017. Abstract | Links | BibTeX | Tags: 3D geometric recording, Depth sensors, Image-based 3D reconstruction, Photogrammetry, Scanning @incollection{Georgopoulos2017a,Digitization of Cultural Heritage assets and sites is a broad term that includes quantitative as well as qualitative data acquisition. Towards a holistic, complete documentation, as outlined by the Venice Charter (1964), capturing the geometry of an object is considered to be one of the first and most essential steps. Within the photogrammetric, the computer vision and the robotics communities, various techniques for 2D, 3D, even 4D data acquisition and digitization have been developed during the past years. Cultural heritage assets are still a challenging object due to the complexity of their shape, the variety of their types, the high requirements of accuracy, and the heterogeneity of the end-users. This chapter focuses on the state of the art of the geometric 3D data acquisition methods, classifying them generally into passive and active. For each category, the available sensors and their working principles are presented and criticized, followed by acquisition network design suggestions and implementation guidelines. In this way, the reader is presented with their merits and disadvantages in order to be able to decide for their correct implementation. |
2016 |
Suma, Rossella; Stavropoulou, Georgia; Stathopoulou, Elisavet K; Gool, Luc Van; Georgopoulos, Andreas; Chalmers, Alan Evaluation of the effectiveness of HDR tone-mapping operators for photogrammetric applications Journal Article In: Virtual Archaeol. Rev., vol. 7, no. 15, pp. 54, 2016, ISSN: 1989-9947. Abstract | Links | BibTeX | Tags: hdr, hdr tone-mapping, high dynamic range, Image-based 3D reconstruction, imaging, keypoint detection @article{Suma2016,textlessp class="VARAbstract"textgreaterThe ability of High Dynamic Range (HDR) imaging to capture the full range of lighting in a scene has meant that it is being increasingly used for Cultural Heritage (CH) applications. Photogrammetric techniques allow the semi-automatic production of 3D models from a sequence of images. Current photogrammetric methods are not always effective in reconstructing images under harsh lighting conditions, as significant geometric details may not have been captured accurately within under- and over-exposed regions of the image. HDR imaging offers the possibility to overcome this limitation, however the HDR images need to be tone mapped before they can be used within existing photogrammetric algorithms. In this paper we evaluate four different HDR tone-mapping operators (TMOs) that have been used to convert raw HDR images into a format suitable for state-of-the-art algorithms, and in particular keypoint detection techniques. The evaluation criteria used are the number of keypoints, the number of valid matches achieved and the repeatability rate. The comparison considers two local and two global TMOs. HDR data from four CH sites were used: Kaisariani Monastery (Greece), Asinou Church (Cyprus), Château des Baux (France) and Buonconsiglio Castle (Italy).textless/ptextgreater |
2017 |
Image-based 3D reconstruction data as an analysis and documentation tool for architects: The case of Plaka bridge in Greece Journal Article In: Int. Arch. Photogramm. Remote Sens. Spat. Inf. Sci. - ISPRS Arch., vol. 42, no. 2W3, pp. 391–397, 2017, ISSN: 16821750. |
Data Acquisition for 3D Geometric Recording: State of the Art and Recent Innovations Book Section In: Vincent, Matthew L.; ópez-Menchero Bendicho, Víctor Manuel L; Ioannides, Marinos; Levy, Thomas E. (Ed.): Herit. Archaeol. Digit. Age Acquis. Curation, Dissem. Spat. Cult. Herit. Data, pp. 1–26, Springer International Publishing, Cham, 2017. |
2016 |
Evaluation of the effectiveness of HDR tone-mapping operators for photogrammetric applications Journal Article In: Virtual Archaeol. Rev., vol. 7, no. 15, pp. 54, 2016, ISSN: 1989-9947. |