April 4, 2018
Perception, Cognition and Interaction: Part II
Ines SARRAY (STARS)
Design of activity recognition systems : An Application to the measurement of human factors.
Activity recognition aims at recognizing and understanding the movements, actions, and objectives of mobile objects. These objects can be humans, animals, or simple artefacts. Many important and critical applications such as surveillance or healthcare require some form of (human) activity recognition. Existing languages can be used to describe models of activities, but they are difficult to master by non computer scientists (ex: doctors). We present a new language dedicated to end users, to describe their activities. We call it ADeL (Activity Description Language) and we provide it with two formats: textual and graphical. This language is intended to be part of a complete recognition system. Such a system has to be real time, reactive, correct, and dependable. We choose the synchronous approach
because it respects these characteristics, it ensures determinism and safe parallel composition, and it allows verification of systems using model-checking. Relying on the synchronous approach, we supply our language with two complementary formal semantics: First a behavioral semantics gives a reference definition of program behavior using rewriting rules. Second, an equational semantics describes the behavior in a constructive way and can be directly implemented.
Valentin Deschaintre (GRAPHDECO)
Materials in Computer Graphics
In this talk I will give a broad picture of materials representation in Computer Graphics.
Convincing material appearance is crucial for realism of a computer generated scene. Material appearance in the real world is the result of complex light interactions. Simulating this physical phenomena is a challenging task.
Many material models -empirical or physically-based- were proposed, but a unified representation has yet to be defined. Designing a material is a complex artistic process; it can be greatly simplified through the acquisition of real object's appearance.
I will discuss limitations of current material models, state-of-the-art in material acquisition from real objects and describe how our recent works eases this process.