User authentication is an important step to protect information and in this field face biometrics is advantageous. Face biometrics is natural, easy to use and less human-invasive. Unfortunately, recent work has revealed that face biometrics is vulnerable to spoofing attacks using low-tech equipments. This article assesses how well existing face… (More)
User authentication is an important step to protect information and in this field face biometrics is advantageous. Face biometrics is natural, easy to use and less human-invasive. Unfortunately, recent work has revealed that face biometrics is vulnerable to spoofing attacks using low-tech cheap equipments. This article presents a countermeasure against such… (More)
This peer-reviewed article can be downloaded, printed and distributed freely for any purposes (see copyright notice below). permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract User authentication is an important step to protect information, and in this context, face biometrics is… (More)
This paper presents a novel approach for the generation of realistic speech synchronized 3D facial animation that copes with anticipatory and perseveratory coarticulation. The methodology is based on the measurement of 3D trajectories of fiduciary points marked on the face of a real speaker during the speech production of CVCV nonsense words. The… (More)
The expansion of mobile communications and the technological evolution of portable devices, raised new applications possibilities that demands the development of more efficient and intuitive interfaces.
Skin wrinkles add realism and expressiveness to 3D facial animation. Modeling and animation of facial wrinkles have been challenging tasks due to the variety of conformations and details subtleness that wrinkles can exhibit. In this paper, we describe a method for real-time simulation of wrinkles taking advantage of the processing power of current GPUs. Our… (More)
Accessibility is a growing concern in several research areas. In computer science, programs that provide accessibility are those that enable people with disabilities to use computing resources efficiently. Since virtual environment relies primarily on the visual mode, usually using writing content, it may seem that access for deaf people is not an issue.… (More)
In this paper we evaluate the effectiveness in conveying speech information of a speech synchronized facial animation system based on context-dependent visemes. The evaluation procedure is based on an oral speech intelligibility test conducted with, and without, supplementary visual information provided by a real and a virtual speaker. Three situations… (More)