Computer-Aided Control for Expressive Rendering

Hedlena Maria de Almeida Bezerra 1
1 ARTIS - Acquisition, representation and transformations for image synthesis
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, INPG - Institut National Polytechnique de Grenoble
Abstract : Digital edition, creation, and design bring the computer's extraordinary flexibility to the act of creation. The near absence of penalty for experimentation can be, however, both a blessing and a curse. Although the unprecedent flexibility of the computer encourages exploration of artistic ideas, it also can be a factor of great distraction to the artist. A great challenge for the development of graphics softwares today is, thus, to take advantage of computer's unprecedented flexibility, while offering to the user the adapted level of control that she or he is looking for. The difficulty when designing such adapted system is highly influenced by the expectations users place on the job performed by computers. As the computer places itself in the role of an assistant in the creation process, we expect it to be 'smart enough' to deserve this place. Usually, we do not accept well when the result of such assistance is not satisfactory. Nevertheless, the level of expectation, and consequently, satisfaction, is not the same for all users. Novice users tend to be less exigent and are often happy when the computer help them to create interesting results without the need of a strong user intervention. Professional users, on the other hand, usually have different needs. They are looking forward to softwares that are good enough in automatizing tasks, but also that provide intuitive controls to manipulate their results. For these users, the bigger is the impact of the work generated by the computer in the final result, the more these tasks are subjected to have control parameters. In this thesis, we demonstrate that the computer can be placed as an incomparable assistant into the visual creation process once well-adapted interaction systems are provided. Adaptation is thus an important aspect because, in different levels, users want to be able to have the control over the result in order to give their touch and express their creativity. The thesis presents two different scenarios demonstrating that controllability plays a major role in expressiveness: a real-time technique to cluster a dynamic 3D scene in order to achieve an automatic, yet controllable output that can then be used as input to any rendering style; and a number of adaptations to a drawing vector graphics primitive called Diffusion Curves that constrain and control the creation of complex color gradients. The thesis proposes, on one hand, mathematical and computational well-adapted representations to provide the user with different levels of control over algorithms of expressive rendering in order to manipulate two- and tridimensional scenes; and, on the other hand, to reproject this technical support into user-friendly software solutions.
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Hedlena Maria de Almeida Bezerra. Computer-Aided Control for Expressive Rendering. Human-Computer Interaction [cs.HC]. Institut National Polytechnique de Grenoble - INPG, 2010. English. ⟨tel-00542521⟩

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