Smile detection for user interfaces

[EN]Perceptual User Interfaces (PUIs) aim at facilitating human-computer interaction with the aid of human-like capacities (computer vision, speech recognition, etc.). In PUIs, the human face is a central element, since it conveys not only identity but also other important information, particularly with respect to the user’s mood or emotional state. This paper describes both a face detector and a smile detector for PUIs. Both are suitable for real-time interaction.

Entorno de simulación aplicado al estudio, comprensión y control del fenómeno de la realimentación acústica

[ES]El diseño de entornos de simulación aplicados al estudio, aprendizaje y adquisición de competencias es un campo de trabajo activo en todos los niveles educativos. Los sucesivos avances experimentados por las Tecnologías de la Información y Comunicaciones (TIC), las plataformas que las sustentan y los estudios e investigaciones llevadas a cabo en el campo de la Interacción Persona Ordenador (Human Computer Interaction, HCI), soportan y hacen posible la realización de herramientas como la que aquí proponemos. Se trata de un entorno de simulación que ha sido diseñado con dos grandes objetivos: fomentar el aprendizaje activo y mejorar el rendimiento académico, como los más destacados. Para ello hemos elegido la Realimentación Acústica en los sistemas de refuerzo sonoro, fenómeno que exige un estudio detallado de los parámetros que lo controlan, que presentado de la forma que aquí proponemos permitirá un mejor aprovechamiento del escaso tiempo disponible para la experimentación en situaciones reales.

Eyewear selector

[EN]The widespread availability of portable computing power and inexpensive digital cameras is opening up new possibilities for retailers. One example is in optical shops, where a number of systems exist that facilitate eyeglasses selection. These systems are now more necessary as the market is saturated with an increasingly complex array of lenses, frames, coatings, tints, photochromic and polarizing treatments, etc. Research challenges encompass Computer Vision, Multimedia and Human-Computer Interaction. Cost factors are also of importance for widespread product acceptance. This paper describes a low-cost system that allows the user to visualize di erent spectacle models in live video. The user can also move the spectacles to adjust its position on the face. Experiments show the potential of the system.

Fast classification in incrementally growing spaces

[EN]The classification speed of state-of-the-art classifiers such as SVM is an important aspect to be considered for emerging applications and domains such as data mining and human-computer interaction. Usually, a test-time speed increase in SVMs is achieved by somehow reducing the number of support vectors, which allows a faster evaluation of the decision function. In this paper a novel approach is described for fast classification in a PCA+SVM scenario. In the proposed approach, classification of an unseen sample is performed incrementally in increasingly larger feature spaces. As soon as the classification confidence is above a threshold the process stops and the class label is retrieved...