Conference Presentations by O. Georgoula
This paper examines the results of image enhancement and point cloud filtering on the visual and ... more This paper examines the results of image enhancement and point cloud filtering on the visual and geometric quality of 3D models for the representation of underwater features. Specifically it evaluates the combination of effects from the manual editing of images' radiometry (captured at shallow depths) and the selection of parameters for point cloud definition and mesh building (processed in 3D modeling software). Such datasets, are usually collected by divers, handled by scientists and used for geovisualization purposes. In the presented study, have been created 3D models from three sets of images (seafloor, part of a wreck and a small boat's wreck) captured at three different depths (3.5m, 10m and 14m respectively). Four models have been created from the first dataset (seafloor) in order to evaluate the results from the application of image enhancement techniques and point cloud filtering. The main process for this preliminary study included a) the definition of parameters for the point cloud filtering and the creation of a reference model, b) the radiometric editing of images, followed by the creation of three improved models and c) the assessment of results by comparing the visual and the geometric quality of improved models versus the reference one. Finally, the selected technique is tested on two other data sets in order to examine its appropriateness for different depths (at 10m and 14m) and different objects (part of a wreck and a small boat's wreck) in the context of an ongoing research in the Laboratory of Photogrammetry and Remote Sensing.
Papers by O. Georgoula
The object of this research project is the documentation of the rail journey of the historic trai... more The object of this research project is the documentation of the rail journey of the historic train of Pelion. From the beginning, the approach of the issue pointed out the immediate need of its digital geometric documentation. In this context, a complete cartographic background of the rail journey of the little train of Pelion and the wider region was created. The Digital Terrain Model (DTM) of the entire region was first created and then followed the ortho resampling of aerial photos that covered the area of interest. In addition to the photographic documentation of all viaducts, high masonry overpasses and stations of the railway and finding related information of historical and technical interest, there has been the survey, the photogrammetrical documentation and 3D visual representation of two worthy examples of engineering work. The development of a multimedia project took place in order to manage and publicise a great amount of data related to the documentation of the rail jou...
this paper, a stereoscopic video of the ancient theatre of Philippi, (Web 1) in N. Greece and its... more this paper, a stereoscopic video of the ancient theatre of Philippi, (Web 1) in N. Greece and its wider area has been created. For the creation of the stereoscopic video, a 3D model of the theatre, a DTM and an orthophotomap of the wider area were used. In order to combine all the data for the creation of the final product, AutoCAD and own home made software (Openview project) have been used. An overview of the successive stages, from theater's 3D scene creation up to stereoscopic video production and some directions for further research based on the conducted work are presented and discussed
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
DIGI-ORCH is a research project with objectives, on one hand, to design and develop "smart" broch... more DIGI-ORCH is a research project with objectives, on one hand, to design and develop "smart" brochures for concerts and educational programs of the State Conservatory of Thessaloniki (Greece), and, on the other, to develop an innovative system for the visualization of information on smart mobile devices (smartphones and tablets). The application of Augmented Reality (AR) provides free access to the information and content of the above concerts and educational programs, combining the information of a robust data server and an easy-to-use user interface of the smart device in real-time. The pilot implementation of the system in real conditions took place at the beginning of December 2022, in an event held at the facilities of the State Conservatory of Thessaloniki. The event was an evening of Chamber Music entitled Musical Kaleidoscope, with the internationally acclaimed artists Simos Papanas (violin), Dimos Goundaroulis (violoncello), and Vassilis Varvaresos (piano). They performed the Piano Trio no. 3 in G minor, Robert Schumann's opus 110, and the Piano Trio no. 2 in E flat major, Op. 100 D. 929 by Franz Schubert. The concert was attended by over 150 attendees. The paper will present the chaîne-operatoire of the development of the system, from the acquisition of raw data (text, video, image, and sound) to the methodology used to produce the "smart" event brochure and the AR application for the above concert. Essentially, this large amount of information that cannot be assessed by a regular printed concert brochure is included in the smart system and displayed on the mobile device when the user locates the appropriate AR patterns on the surface of the analog concert poster and/or on the pages of the brochure. This information comprised of ie. additional text and images about the composers and their musical projects, about the musicians of the concert (e.g. biographies), their interviews and rehearsals (video) before the concert, information about the State Conservatory of Thessaloniki (text, video, image, and sound), 3D models of musical instruments, 360° of the concert space, etc. diverse multimedia material.
The purpose of this project is to test High Resolution Stereoscopic (HRS) data of SPOT5. This pro... more The purpose of this project is to test High Resolution Stereoscopic (HRS) data of SPOT5. This project is done in the framework of the “HRS study Team ” international test, supported by ISPRS-CNES. The Digital Elevation Model (DEM) was derived from the HRS data and was evaluated by using a 3D reference data set. The study site for HRS data is located in Manosque, France. It is a countryside landscape, with fields and villages. The height relief is medium and in some areas considerably intensive. The HRS data was acquired on 14th August 2002. A number of different DEM generation experiments were carried out, in order to examine the influence of different processing parameters on the final accuracy of the DEM. Thus: 1) The same date acquisition of the stereo-pair reduces the radiometric variations of images; nevertheless, the fact that the images are captured by two different sensors has led us to apply a histogram matching technique for image pre-processing, in some experiments. 2) Th...
The purpose of this project is to test High Resolution Stereoscopic (HRS) data of SPOT5. This pro... more The purpose of this project is to test High Resolution Stereoscopic (HRS) data of SPOT5. This project is done in the framework of the “HRS study Team ” international test, supported by ISPRS-CNES. The Digital Elevation Model (DEM) was derived from the HRS data and was evaluated by using a 3D reference data set. The study site for HRS data is located in Manosque, France. It is a countryside landscape, with fields and villages. The height relief is medium and in some areas considerably intensive. The HRS data was acquired on 14 th August 2002. A number of different DEM generation experiments were carried out, in order to examine the influence of different processing parameters on the final accuracy of the DEM. Thus: 1) The same date acquisition of the stereo-pair reduces the radiometric variations of images; nevertheless, the fact that the images are captured by two different sensors has led us to apply a histogram matching technique for image pre-processing, in some experiments. 2) T...
The aim of this project is to evaluate the possibilities that the high resolution satellite image... more The aim of this project is to evaluate the possibilities that the high resolution satellite image offers in the field of archaeological research. More specific, the present study concerns the identification of buried archaeological remains with the aid of the Pansharpened (fused) image Quickbird-2. For this purpose, the fused image (spatial resolution 0.70m and spectral resolution 4 bands), that covers an extended area of the archaeological site of Philippoi in N. Greece, has been used. The new image has been produced from the fusion of two ortho images. The latest have been derived from the panchromatic image and the multispectral image as well. The generation of the above two ortho images has been based on a DTM of the area, photogrammetrically produced, and on the Quickbird sensor model. The fusion has been established with the PCA technique. The fused image has been evaluated with statistical criterions. Enhancement technique, as PCA was applied to facilitate the optical interpr...
Photogrammetric data, whether it refers to terrain or to close-range images, are typically massiv... more Photogrammetric data, whether it refers to terrain or to close-range images, are typically massive in size. This results in a dataset that is often too large to handle and prohibits any form of real-time interaction or even visualization. Therefore, special database structures and image storing formats should be sought. FlashPix image format supports images of any size, and any resolution. Images in FPX format are stored at multiple independent resolutions. This special structure allows applications to select the appropriate resolution for a certain procedure and to access directly the specific areas of an image needed for the operation being performed. This eliminates the need to process the entire image for viewing a small part of it, or to handle a large amount of data (high resolution image) in order to produce a smaller amount of data (displaying a lower resolution image). This paper presents research efforts on identifying visualization tools, which can make use of this specia...
ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2016
This paper examines the results of image enhancement and point cloud filtering on the visual and ... more This paper examines the results of image enhancement and point cloud filtering on the visual and geometric quality of 3D models for the representation of underwater features. Specifically it evaluates the combination of effects from the manual editing of images’ radiometry (captured at shallow depths) and the selection of parameters for point cloud definition and mesh building (processed in 3D modeling software). Such datasets, are usually collected by divers, handled by scientists and used for geovisualization purposes. In the presented study, have been created 3D models from three sets of images (seafloor, part of a wreck and a small boat's wreck) captured at three different depths (3.5m, 10m and 14m respectively). Four models have been created from the first dataset (seafloor) in order to evaluate the results from the application of image enhancement techniques and point cloud filtering. The main process for this preliminary study included a) the definition of parameters for ...
Journal of Cultural Heritage, 2010
Locating buried antiquities in wide research areas requires the collection and the processing of ... more Locating buried antiquities in wide research areas requires the collection and the processing of a large number of data, ie aerial photographs, satellite images, historic and contemporary maps, bibliographic and special research, etc. The optimum management of all this data ...
The object of this research project is the documentation of the rail journey of the historic trai... more The object of this research project is the documentation of the rail journey of the historic train of Pelion. From the beginning, the approach of the issue pointed out the immediate need of its digital geometric documentation. In this context, a complete cartographic background of the rail journey of the little train of Pelion and the wider region was created. The Digital Terrain Model (DTM) of the entire region was first created and then followed the ortho resampling of aerial photos that covered the area of interest. In addition to the photographic documentation of all viaducts, high masonry overpasses and stations of the railway and finding related information of historical and technical interest, there has been the survey, the photogrammetrical documentation and 3D visual representation of two worthy examples of engineering work. The development of a multimedia project took place in order to manage and publicise a great amount of data related to the documentation of the rail jou...
univie.ac.at
... Airborne Thematic Mapping/Airborne Laser Scanning Despite broadening horizons in recent years... more ... Airborne Thematic Mapping/Airborne Laser Scanning Despite broadening horizons in recent years, 'Aerial Archaeology ... which gives geometric information of higher precision than airborne radar. ... vertical, in Bewley, RH and Rączkowski, W., (ed). Aerial archaeology: developing ...
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
The Conservation and the Restoration of Cultural Heritage is a particularly specialized and inter... more The Conservation and the Restoration of Cultural Heritage is a particularly specialized and interdisciplinary process. It requires scientific monitoring and planning and incorporation of skills and knowledge in the academic milieu. Relevant studies programs and courses are primarily designed to explore the possibility of cooperation between scientists (archaeologists, architects, surveyors, engineers etc.). Participating in such an educational institution (Interdepartmental Program of Postgraduate Studies "Protection, Conservation and Restoration of Cultural Monuments", AUTh, Greece), the development of a protocol for a GIS related to the restoration of cultural heritage buildings and sites through documentation stage was born out of necessity. Α GIS application including the documentation (geometric, architectural, structural etc.) of the historical complex of Saint John, the Baptist (19th century, Kavala, Greece), while using modern 3D representational techniques (laser scanner, topography, photogrammetry, GPS), and the related thematic information (analysis, archive data) has been organized for that purpose and has been used as a case study. The main objectives of the project are to give guidelines regarding the collection, the processing and the management of heritage data, to articulate the cross-disciplinary collaboration/synergy and to provide an educational toolkit. The methodology is proposed to be applied to other objects of study such as archaeological sites, individual structures, monuments and sites of different dating and use (e.g., industrial, religious, fortification etc.).
The object of this research project is the documentation of the rail journey of the historic trai... more The object of this research project is the documentation of the rail journey of the historic train of Pelion. From the beginning, the approach of the issue pointed out the immediate need of its digital geometric documentation. In this context, a complete cartographic background of the rail journey of the little train of Pelion and the wider region was created.
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Conference Presentations by O. Georgoula
Papers by O. Georgoula