This paper proposes an active appearance model (AAM) based human computer interface (HCI) to control an intelligent wheelchair (IW), namely, RoboChair. Adaboost is applied as the face detection module, while AAM is used to undertake face tracking task. Inverse compositional image alignment is implemented to fit the trained AAM. Subsequently, an straightforward method is carried out to estimate ...

In this paper three problems related to the analysis of facial images are addressed: the estimation of the illuminant direction, the compensation of illumination eeects and, nally, the recovery of the pose of the face, restricted to in-depth rotations. The solutions proposed for these problems rely on the use of computer graphics techniques to provide images of faces under diierent illumination...

Although faces are often included in the broad category of emotional visual stimuli, the affective impact of different facial expressions is not well documented. The present experiment investigated startle electromyographic responses to pictures of neutral, happy, angry, and fearful facial expressions, with a frontal face direction (directed) and at a 45° angle to the left (averted). Results sh...

Gaze direction provides an important and ubiquitous communication channel in daily behavior and social interaction of humans and some animals. While several studies have addressed gaze direction in synthesized simple scenes, few have examined how it can bias observer attention and how it might interact with early saliency during free viewing of natural and realistic scenes. Experiment 1 used a ...

This paper presents a relatively new direction of CSCL research: small-group learning in the classroom. This research direction has received relatively little attention within the CSCL community. In this paper we explore the possibilities of collaborative technology in the classroom. We use the distinction between task-related and social-emotional interactions as a criterion for computer suppor...

Abstract In this paper, we propose an illumination normalization approach, which apparently improves the face recognition accuracy in outdoor environments. The proposed approach computes the frequency variability and reflection direction on local face regions where the direction of the light source is unknown. It effectively recovers the illumination on a face surface. Majority of conventional ...