André Ferreira

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BACKGROUND Two different Human-Machine Interfaces (HMIs) were developed, both based on electro-biological signals. One is based on the EMG signal and the other is based on the EEG signal. Two major features of such interfaces are their relatively simple data acquisition and processing systems, which need just a few hardware and software resources, so that(More)
We present in this paper a study of three EEG signals feature extraction techniques. These techniques have been widely employed in researches of emotional states recognition: statistical characteristics, features based on PSD (Power Spectral Density) and features based on HOC (High Order Crossings). The validation was performed via classification of(More)
Designing and implementing the interaction behavior for body tracking capable systems requires complex modeling of actions and extensive calibration. Being the most recent and successful device for robust interactive body tracking, Microsoft's Kinect has enabled natural interaction by the use of consumer hardware, providing detailed and powerful information(More)
Volcano Salvation is an innovative computer game that combines two input modalities: hand gestures to lift, move, and manipulate objects, and head tracking to change perspective within the game world. The two input devices are a webcam and a Leap Motion controller. Volcano Salvation is an immersive strategy game that contributes to the field of game design(More)
This paper presents the evaluation of seven techniques of feature extraction (PSD, F-Test, EMD, MCE, CCA, LASSO and MSI) for gaze-target detections in a SSVEP-based BCI. Two type of technologies for visual stimulation were used (LCD and LEDs). Five differents windows lengths (1, 2, 4, 5 and 10 s) were used and seven volunteers participated in this study.(More)
— In NGN service-provisioning platforms the existence of an efficient and flexible admission control mechanism is essential for providing quality of service in a reliable and stable way, avoiding congestion scenarios caused by indiscriminate and uncontrolled service requests. The capability of modulating and regulating the rate of call acceptance, and(More)
Two different electro-biological signal based Interfaces for impaired people were developed: EMG and EEG based. Such interfaces present like main characteristics relatively simple acquisition and processing systems, which need of few hardware and software resources, so that they are computational and financial low cost solutions. Both interfaces have been(More)