Claudia Sevivas

I’m currently the coordinator of the bachelor degree of Game Development at IADE - Creative University.

RESEARCH INTERESTS

My work revolves around leveraging technologies like Serious Games and Virtual Worlds, Multimodal Interaction and Visualization, and Machine Learning and Image Processing. I’m particularly interested in utilizing these tools to enhance learning experiences, create immersive environments, and analyze complex datasets. Additionally, I delve into the realm of VJing, Live Painting, and Video Art, exploring the intersection between digital and analog mediums to create innovative artistic expressions. Moreover, I design and implement Interactive Installations, aiming to engage audiences in interactive experiences that blur the boundaries between art and technology. Through these endeavors, I aim to contribute to the advancement of interdisciplinary research and the exploration of novel applications in various domains.

selected publications

IEEE

Ancient document recognition Using Fuzzy Methods

Sousa, J.M.C., Caldas Pinto, J.R., Ribeiro, C.S., and Gil, J.M.

In The 14th IEEE International Conference on Fuzzy Systems, 2005. FUZZ ’05. 2005,

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This paper proposes an optical character recognition system based on fuzzy logic for ancient printed documents. The recognition process consists of two stages: training with collected character image examples and classification of new character images. The proposed OCR builds fuzzy membership functions from oriented features extracted using Gabor filter banks. Results on a significant test led to a character recognition success rate of 88%.
Springer

Stroke-based splatting: an efficient multi-resolution point cloud visualization technique

Anjos, Rafael Kuffner, Ribeiro, Claudia Sofia, Lopes, Daniel Simões, and Pereira, João Madeiras

The Visual Computer 2018,

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Current state-of-the-art point cloud visualization techniques have shortcomings when dealing with sparse and less accurate data or close-up interactions. In this paper, we present a visualization technique called stroke-based splatting, which applies concepts of stroke-based rendering to surface-aligned splatting, allowing for better shape perception at lower resolutions and close-ups. We create a painterly depiction of the data with an impressionistic aesthetic, which is a metaphor the user is culturally trained to recognize, thus attributing higher quality to the visualization. This is achieved by shaping each object-aligned splat as a brush stroke, and orienting it according to globally coherent tangent vectors from the Householder formula, creating a painterly depiction of the scanned cloud. Each splat is sized according to a color-based clustering analysis of the data, ensuring the consistency of brush strokes within neighborhood areas. By controlling brush shape generation parameters and blending factors between neighboring splats, the user is able to simulate different painting styles in real time. We have tested our method with data sets captured by commodity laser scanners as well as publicly available high-resolution point clouds, both having highly interactive frame rates in all cases. In addition, a user study was conducted comparing our approach to state-of-the-art point cloud visualization techniques. Users considered stroke-based splatting a valuable technique as it provides a higher or similar visual quality to current approaches.
Elsevier

Gamifying requirement elicitation: Practical implications and outcomes in improving stakeholders collaboration

Ribeiro, Claudia, Farinha, Carla, Pereira, João, and Silva, Miguel Mira

Entertainment Computing 2014,

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The requirements engineering process is a key phase of the Information System development since it determines its functionalities and its operation. Before requirements can be analyzed, modeled, or specified they must be gathered through an elicitation process. Requirements elicitation is non-trivial because you can never be sure you get all requirements from the user or stakeholder by just asking them what the system should do. Requirements elicitation practices include interviews, questionnaires, user observation, workshops, brainstorming, use cases, role playing and prototyping. However, these common procedures are still prone to be ambiguous or incorrect which can lead the Information Systems to failure. It is consensual that one of the major problem of this activity relates to the communication and collaboration between different and distant stakeholders. Thus, recent studies have been proposing web collaborative tools to gather these stakeholders in order to elicit requirements. The paper aims to evaluate the effectiveness and acceptance of such a collaborative tool which was developed by using a gamification approach and the Six Thinking Hats method. The document also makes a discussion of the implication and outcomes of improving stakeholders collaboration.
ACM

Capturing and documenting creative processes in contemporary dance

Ribeiro, Claudia, Anjos, Rafael Kuffner, and Fernandes, Carla

In Proceedings of the 4th International Conference on Movement Computing 2017,

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The performing arts, and dance in particular, have been considered as intangible cultural heritage by UNESCO since 2003. This acknowledgement reflects the importance of preserving the knowledge generated within this art form for future generations. Nevertheless, what and how this sensible material should be preserved is still lacking clear methodological approaches. When considering creative processes, this seems an even more daunting task, as it goes beyond simply documenting the final product of a creation. Recent advancements in technology has allowed to consider other approaches of capturing data apart from video or photography, which are mostly static and have a single viewpoint. In this paper we describe how 3D data capture and point cloud visualization techniques have been used to capture and document João Fiadeiro’s choreographic and compositional processes. Together with Fiadeiro we have identified a sub-set of core concepts of his method which have then been used to conduct two improvisation sessions involving Fiadeiro’s dancers and himself. Those concepts have been used as the basis for the development of new visualization techniques that better illustrate, in an interactive system, the complexity of Fiadeiro’s creative process.