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Papers by Christos-Nikolaos Anagnostopoulos
Zenodo (CERN European Organization for Nuclear Research), Jul 31, 2023
Photogrammetry has emerged as a valuable technique for digitizing real-world objects. In the fiel... more Photogrammetry has emerged as a valuable technique for digitizing real-world objects. In the field of archaeology, the generation of realistic 3D models from 2D images has become a preferred method for scholars engaged in excavation, conservation, and restoration work. While the concept of modelling entire excavations or small objects from various angles is exciting, the precision and realism of 3D models remain areas of investigation. Initially, photogrammetric techniques were primarily used for large-scale or medium-scale objects. However, in recent years, there has been a growing interest in applying photogrammetry to model small-scale objects. The crucial question for small objects, ranging from a few centimeters to a few tens of centimeters in size, is whether photogrammetry can produce high-precision 3D models. This paper focuses on a small ceramic sherd from a handmade replica of a large red-figure amphora. Through an iterative process involving photogrammetry and macrophotography (close-up photography), ten different digital models of the sherd are generated. From each of these models, thickness measurements are extracted at 24 specific points, allowing for a comparison and calculation of uncertainties associated with these measurements. The dispersion of the measurements around the mean value provides an estimation of the actual size values and measurement errors, enabling an evaluation of the precision of photogrammetry in size recognition. Furthermore, the same sherd is measured ten times using a caliper at the same points, and the thickness measurements are compared to calculate the uncertainties of the caliper measurements. By estimating the sizes and their respective errors, the measurement error of the photogrammetry technique can be determined. Overall, this study aims to investigate the precision of photogrammetry in generating high-precision 3D models and compare it to the measurements obtained from a caliper.
IFIP Advances in Information and Communication Technology, 2023
2022 IEEE International Symposium on Mixed and Augmented Reality Adjunct (ISMAR-Adjunct)
Encyclopedia of Computer Graphics and Games, 2015
Lecture Notes in Computer Science, 2023
Cultural heritage is an integral part of history and in order to better preserve, manage and high... more Cultural heritage is an integral part of history and in order to better preserve, manage and highlight our cultural heritage it is necessary to first proceed to digitize and document it. Geometric documentation of a cultural heritage asset is the process of collecting, processing, rendering, and recording data to determine the location and actual form, shape, and size of a monument in three-dimensional space at a given time. This chapter presents the modern methods and technologies for the 3D acquisition of cultural heritage assets and discusses the related challenges and risks. Moreover, we are presenting the possible quality aspects observed in the fieldwork that arise from the equipment, the environmental conditions that prevail during the surveying, the object itself, the personnel expertise and the stakeholder conditions.
Applied sciences, Jun 9, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
IFIP advances in information and communication technology, 2023
IFIP Advances in Information and Communication Technology, 2023
IFIP advances in information and communication technology, 2023
Journal of physics, Apr 1, 2022
The digital recording of cultural heritage artifacts and their replication with Computer-Aided Ma... more The digital recording of cultural heritage artifacts and their replication with Computer-Aided Manufacturing (CAM) techniques has found many applications in the cultural heritage (CH) domain, and it is considered paramount. Although subtractive manufacturing comes with a tremendous financial cost since most of the hardware and the software used in the fabrication process are expensive and mainly proprietary. Consequently, many scholars benefit only from the cost-effective, easy-to-use, and prevalent additive manufacturing processes which can serve within certain limitations. In this work, we propose a framework to democratize the subtractive manufacturing processes required to replicate digitally recorded cultural heritage artifacts using open-source/license-free software and hardware tools. We further present an application of the framework by simulating the fabrication process of a laser-scanned bass relief using open-source and license-free CAM software as described in the proposed framework.
In this paper, we simulate the incredible story of the Francois Vase, on a remarkable ancient amp... more In this paper, we simulate the incredible story of the Francois Vase, on a remarkable ancient amphora depicting Achilles and Briseis exhibited in the provincial museum Sigismondo Castromediano in Lecce, Italy. A high precision handmade replica of the original red-figure style masterpiece, 50 cm tall, from the collection of the museum in Lecce was built, fully decorated in our laboratory and then intentionally destroyed simulating the archaeological disaster of the Francois Vase. The handmade amphora (i.e. replica) was broken in 507 fragments, out of which 148 sherds (or ostraca) were offered for digital restoration through the Thickness Profile method on an on-going project.
![Research paper thumbnail of Review of the Book Vehicular Networking [Book Review]](https://attachments.academia-assets.com/114339580/thumbnails/1.jpg)
](IEEE Intelligent Transportation Systems Magazine, 2016
IEEE Intelligent Transportation Systems Magazine, 2011
Zenodo (CERN European Organization for Nuclear Research), Jul 31, 2023
Photogrammetry has emerged as a valuable technique for digitizing real-world objects. In the fiel... more Photogrammetry has emerged as a valuable technique for digitizing real-world objects. In the field of archaeology, the generation of realistic 3D models from 2D images has become a preferred method for scholars engaged in excavation, conservation, and restoration work. While the concept of modelling entire excavations or small objects from various angles is exciting, the precision and realism of 3D models remain areas of investigation. Initially, photogrammetric techniques were primarily used for large-scale or medium-scale objects. However, in recent years, there has been a growing interest in applying photogrammetry to model small-scale objects. The crucial question for small objects, ranging from a few centimeters to a few tens of centimeters in size, is whether photogrammetry can produce high-precision 3D models. This paper focuses on a small ceramic sherd from a handmade replica of a large red-figure amphora. Through an iterative process involving photogrammetry and macrophotography (close-up photography), ten different digital models of the sherd are generated. From each of these models, thickness measurements are extracted at 24 specific points, allowing for a comparison and calculation of uncertainties associated with these measurements. The dispersion of the measurements around the mean value provides an estimation of the actual size values and measurement errors, enabling an evaluation of the precision of photogrammetry in size recognition. Furthermore, the same sherd is measured ten times using a caliper at the same points, and the thickness measurements are compared to calculate the uncertainties of the caliper measurements. By estimating the sizes and their respective errors, the measurement error of the photogrammetry technique can be determined. Overall, this study aims to investigate the precision of photogrammetry in generating high-precision 3D models and compare it to the measurements obtained from a caliper.
IFIP Advances in Information and Communication Technology, 2023
2022 IEEE International Symposium on Mixed and Augmented Reality Adjunct (ISMAR-Adjunct)
Encyclopedia of Computer Graphics and Games, 2015
Lecture Notes in Computer Science, 2023
Cultural heritage is an integral part of history and in order to better preserve, manage and high... more Cultural heritage is an integral part of history and in order to better preserve, manage and highlight our cultural heritage it is necessary to first proceed to digitize and document it. Geometric documentation of a cultural heritage asset is the process of collecting, processing, rendering, and recording data to determine the location and actual form, shape, and size of a monument in three-dimensional space at a given time. This chapter presents the modern methods and technologies for the 3D acquisition of cultural heritage assets and discusses the related challenges and risks. Moreover, we are presenting the possible quality aspects observed in the fieldwork that arise from the equipment, the environmental conditions that prevail during the surveying, the object itself, the personnel expertise and the stakeholder conditions.
Applied sciences, Jun 9, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
IFIP advances in information and communication technology, 2023
IFIP Advances in Information and Communication Technology, 2023
IFIP advances in information and communication technology, 2023
Journal of physics, Apr 1, 2022
The digital recording of cultural heritage artifacts and their replication with Computer-Aided Ma... more The digital recording of cultural heritage artifacts and their replication with Computer-Aided Manufacturing (CAM) techniques has found many applications in the cultural heritage (CH) domain, and it is considered paramount. Although subtractive manufacturing comes with a tremendous financial cost since most of the hardware and the software used in the fabrication process are expensive and mainly proprietary. Consequently, many scholars benefit only from the cost-effective, easy-to-use, and prevalent additive manufacturing processes which can serve within certain limitations. In this work, we propose a framework to democratize the subtractive manufacturing processes required to replicate digitally recorded cultural heritage artifacts using open-source/license-free software and hardware tools. We further present an application of the framework by simulating the fabrication process of a laser-scanned bass relief using open-source and license-free CAM software as described in the proposed framework.
In this paper, we simulate the incredible story of the Francois Vase, on a remarkable ancient amp... more In this paper, we simulate the incredible story of the Francois Vase, on a remarkable ancient amphora depicting Achilles and Briseis exhibited in the provincial museum Sigismondo Castromediano in Lecce, Italy. A high precision handmade replica of the original red-figure style masterpiece, 50 cm tall, from the collection of the museum in Lecce was built, fully decorated in our laboratory and then intentionally destroyed simulating the archaeological disaster of the Francois Vase. The handmade amphora (i.e. replica) was broken in 507 fragments, out of which 148 sherds (or ostraca) were offered for digital restoration through the Thickness Profile method on an on-going project.
IEEE Intelligent Transportation Systems Magazine, 2016
IEEE Intelligent Transportation Systems Magazine, 2011