Research Projects

Digitisation of movable cultural heritage artefacts

The project involved the application of various three dimensional digitisation techniques in order to produce digital archives to be promoted through the web. The techniques that been followed were :

 1. High accuracy three dimensional digitisation based on laser triangulation
 2. Three dimensional reconstruction of mobile objects based on the 'Shape from silhouette' technique
 3. Three dimensional reconstruction of mobile objects based on the 'Shape from structured light' technique

Experimental digitisation of objects of different materials (ceramics, wood, glass, marble, gold, etc) were performed during the project. The morphological characteristics and specialties that we might confront in cultural heritage artefacts were documented.

Experiments with transformation algorithms (noise reduction, volumetric rendering, simplification) of 3D data sets were also performed and various visualisation methodologies were tested.

 

Digitisation of Monuments

Case : Byzantine Mani: Digitisation of Church Monuments in the region of Mani, Peloponnese
The project regards the digitization and 3D reconstruction of the Byzantine church in the area of Stavri in Mani and the Post-Byzantine church of Aghios Vasileios in the Kelefa settlement. The goal of the project was the dissemination of the monuments and an international accessibility to them. The digitisation regards the exterior as well as the interior of the churches. The deliverables were two 3D digital models (one for each churche) that enable the visitor to perform a virtual visit and wandering in each one of them.

 

Digitisation of cultural heritage areas

The project involved the three dimensional reconstructions of urban areas. The project deals with the idea of using commercial and open source software systems in 3D graphics in order to produce realistic virtual walkthroughs for culture heritage promotion with a minimum budget and low cost infrastructure.

We have attempted the 3D reconstruction of three settlements without the use of any expensive equipment (e.g. commercial 3D range scanners based on techniques like triangulation, modulation or time of flight).

We have produced a fully textured 3D model that can be easily accessed from the Internet using a VRML viewer plug in for your browser. Acceptable downloading times have been achieved even for PSTN connections by reducing the texture map quality.


 

3D Digitisation of the Byzantine Castle in Kavala's Prefecture

The castle (Acropolis) of Kavala is located on the top of the Panagia (Virgin Mary) peninsula where the old town is built. During the Byzantine times successive reconstructions and operations for the fortification of the town took place. The castle, as we see it today, was built in the first quarter of the 15th century, based on the Byzantine era's foundation. It is a two bailey castle with a tower situated in between.

The equipment used for the digitisation of the castle included, apart from a typical 6MP dSLR camera, a time-of-flight 3D colour range scanner (Optech ILRIS-3D). The raw scan data composed of 36 millions 3D points. These partial scans were merged using the Iterative Closest Point algorithm and with further processing (overlapping elimination, noisy and unnecessary parts removal) resulted a 27 millions 3D points.

The final model is composed by 15,000 polygons and it can be described using the VRML 2.0 format with a total of 430KB (gzip compressed).The size of the texture images was 15 MB compressed using the JPEG algorithm. The texture baking technique has been used to display in real time ambient occlusion shadowing.


 

3D Reconstruction of the harbour area of Argostoli town of Greek island Kefalonia

Historic virtual walkthrough at the harbour area of Argostoli town of Greek island Kefalonia, as it was before the devastating earthquake of 1952.

The 3D reconstruction of the area is based on the topographic map and photographic material from that period, which captured the area as it was before the earthquake