Multi-image photogrammetry can in favorable conditions even under water generate large clouds of 3D points which can be used for visualization of sunken heritage. For analysis of under-water archeological sites and comparison of artifacts, more compact shape models must be reconstructed from 3D points, where each object or a part of it is modeled individually. Volumetric models and superquadric models in particular are good candidates for such modeling since automated methods for their reconstruction and segmentation from 3D points exist. For the study case we use an underwater wreck site of a Roman ship from 2nd century AD located near Sutivan on island Brač in Croatia. We demonstrate how superquadric models of sarcophagi and other stone blocks can be reconstructed from an unsegmented cloud of 3D points obtained by multi-image photogrammetry. We compare the dimensions of stone objects measured directly on the corresponding 3D point cloud with dimensions of the reconstructed superquadric models and discuss other advantages of these volumetric models. The average difference between point-to-point measurements of stone blocks and the dimensions of the corresponding superquadric model is on the order of few centimeters. We adapted the method for modelling of amphorae, which was described in a book chapter, and we are researching how to tackle automatic analysis of huge 3D point clouds which often result in documentation of cultural heritage. This is not the only result of our collaboration with underwater archeologists. We took care of multi-image photogrammetry during the documentation of a Roman boat found in river Ljubljanica, near Sinja Gorica, which was reported in the journal Archeological Review and at conferences.
F.17 Transfer of existing technologies, know-how, methods and procedures into practice
COBISS.SI-ID: 1536404675When people talk to each other, eye contact is very important for a trustful and efficient communication. Video-conferencing systems were invented to enable such communication over large distances, recently using mostly Internet and personal computers. Despite low cost of such solutions, a broader acceptance and use of these communication means has not happened yet. One of the most important reasons for this situation is that it is almost impossible to establish eye contact between distant parties on the most common hardware configurations of such videoconferencing systems, where the camera for face capture is usually mounted above the computer monitor, where the face of the correspondent is observed. Different hardware and software solutions to this problem of missing eye contact have been proposed over the years. In this article we propose a simple solution that can improve the subjective feeling of eye contact, which is based on how people perceive 3D scenes displayed on slanted surfaces, and offer some experiments in support of the hypothesis. This article the latest in a series of articles where we studied the view direction. Two journal articles and two conference papers are studying monitors equipped with cameras. Using such equipment one can use computer vision methods to analyse temporal, spatial and demographic properties of observers and adjust the displayed information accordingly. We defined a new concept of dynamic anamorphosis (article in the journal Interacting with computers), where the displayed image is continuously adjusted so that to the moving observer appears without perspective deformation. Based on this principle we exhibited an art installation at the Festival of new Speculum Artium.
F.02 Acquisition of new scientific knowledge
COBISS.SI-ID: 1537319619In contemporary digital art computer technology plays an integral part not only in the creation of art pieces but also in their functioning as artworks. Such digital artworks have usually a performative or interactive character and therefore rely on an underlying working computer system. Since computer technology advances with such unrelenting pace, hardware and software modules eventually become obsolete. How to preserve digital art works in these circumstances from an art preservation standpoint is much debated. In this article we discuss issues in the preservation of digital art works using as a case study a 15 years old interactive art installation ‘15 seconds of fame’. The art installation could be maintained in a good working order first just by small changes, reacting mainly to new versions of operating systems. After more then ten years a complete rewrite of the code was necessary to move it to a new computing platform. We are engaged with new media art for more than 20 years. Since 2008 have members of our research program created 15 new media art pieces, which were included into 12 exhibition catalogues and included into 25 different exhibitions. We published a book on new media (Narvika Bovcon), 17 articles in journals, we participated on 5 round tables on connecting art and science, in two radio broadcasts, and had several invited talks on this topic. We wrote an article for the journal Digital Creativity about our latest interactive art installation "Light Fountain".
F.23 Development of new system-wide, normative and programme solutions, and methods
COBISS.SI-ID: 1537491651Members of the project group are leaders of the currently largest initiative for visual object tracking performance evaluation - the Visual object tracking challenge (VOT). The purpose of the initiative is, apart from objective tracker evaluation, construction of new datasets and performance evaluation protocols. In 2017 the initiative has organized the fifth VOT challenge and workshop within a major computer vision conference ICCV 2017. Over a hundred researchers have attended the challenge and the workshop. A major novelty in VOT2017 was analysis of realtime trackers, which are crucial component in modern autonomous robotic systems. This year, the University of Ljubljana recognized the work of the VOT initiative as one of ten most excellent research achievements of UL in 2017 (https://www.uni-lj.si/v_ospredju/2017120413202206/).
B.01 Organiser of a scientific meeting
COBISS.SI-ID: 1537719235The aim of the project was building an automated system for inspection of damages on the cars. The task was to design a rich sensory system of proximity sensors and cameras and develop advanced computer vision solutions for detecting the various parts of the cars, including glass, all defects and position them in the car model. We have made several innovations on sensor-based glass detection on cars, robust real-time fringe pattern detectors that do not assume a static scene and novel computer vision methods for defects detections. The project is an example of research achievements and expertise transfer to practical applications. The developed prototype was presented at foreign and domestic delegation visits at our faculty as well as through various public communication channels such as a 2017 Research Review report of FRI, web and television contact shows. We have been involved in many other applications and industrial projects which are listed under Section 23 -- these were presented to the public as well.
F.09 Development of a new technological process or technology