Creating and sharing knowledge for telecommunications

IT researchers´ 3D facial animation technology distinguished at the Web3D 2018

on 17-07-2018

... Verónica Orvalho and Ozan Cetinaslan, both researchers from IT in Porto were distinguished with the 2nd Best Paper Award in the 23rd international ACM conference on 3D web technology conference (Web3D 2018), held in Poznan, Poland between 20-22 June. With attendees from all over the world, the Web3D is a well-known and prestigious conference in the field of computer graphics, with an acceptance rate of around 40%.

Computer generated characters are ubiquitous in movies, cartoons, advertisements, computer games, medical simulators, etc. Facial animation plays a critical role for the digital character to carry emotions and personality. In common practice, rig-based methods are used to create content for facial animation. However, rig-based animation is a challenging task due to the complexity of authoring the rig to create convincing and meaningful facial poses for each key-frame of animation sequence. Besides, popular state-of-the-art animation and modeling software packages support the rig structures with their external interfaces which are not practical for the users. In their paper “Direct Manipulation of Blendshapes Using a Sketch-Based Interface", Veronica and Ozan built a framework which allows artists and animators to create their animation sequences by just sketching on the 3D facial model. “Besides, we optimized the underneath mathematical algorithm for stable and intuitive end results. We tested our framework on many different facial models and obtained the desired keyframe facial poses for animation in a quite short time period. Except for the ultimate extreme cases, we did not observe any erroneous or singular poses that can surprise animators or digital artist”, explained Ozan Cetinaslan. In building the framework an extreme attention was given to simplicity and clarity, making it suitable not just for the more experienced users but also the more novice.

IT researchers win the IET Award for the best paper in Microwaves, Antennas & Propagation

on 15-07-2018

... Rafael Caldeirinha and Telmo Fernandes, both from IT in Leiria, Iñigo Cuiñas from the University of Vigo and David Ferreira (a former Ph.D student, now working at Blu Wireless, Lda, Bristol, England), have won the 2018 Premium Award for the Best Paper in IET Microwaves, Antennas & Propagation. The IET Premium Award, issued by the Institute of Engineering and Technology in the UK, is a highly prestigious international award that recognises the best research paper in Microwave, Antennas & Propagation during the last two years. The winning paper, entitled “Dual-band single-layer quarter ring frequency selective surface for Wi-Fi applications” was published in IET Microwaves, Antennas & Propagation, Volume 10, Issue 4, 19 March 2016.

With the widespread anticipation of the Internet of Things in the near future and the evolving of 5G communication systems, particularly in residential areas, the number of Wi-Fi connected devices may increase exponentially. As a consequence, it is likely that some ISM frequency bands will soon become highly saturated. In certain situations, it may be useful to limit the coverage of existing and emerging wireless networks to pre-defined areas, such as an individual flat or a room and, thus, inherently minimising co-channel interference from/to neighbour Wi-Fi networks.

To this extent, the authors have proposed a new frequency selective surface (FSS) design to be used in Wi-Fi shielding applications as either a band reject or band-pass dual-band single-layer filter. The proposed design consists of a combination of basic elements, that is, ring loops/slots, and is tuned at both 2.4 and 5.2 GHz Wi-Fi frequency bands. It has a relatively stable frequency response in the aforementioned Wi-Fi bands for incidence angles ranging from 0° to 45°.

Simulation and model validation through measurements demonstrate the performance of the proposed FSS design. Active variants are also proposed and briefly evaluated, which should allow for applications where an on–off switching is desired at 2.4 and 5.2 GHz Wi-Fi bands. In a more generic case, this FSS design might also be useful for other applications where the target frequency bands have a relative offset similar to the Wi-Fi bands.

On the photo, from left to right: Rafael Caldeirinha, David Ferreira, Iñigo Cuiñas and Telmo Fernandes