Different modes of human-computer interaction will play a major part in making computing increasingly pervasive. More natural methods of interaction are in demand to replace devices such as the keyboard and the mouse, and it is becoming more important to develop the next generation of human-computer interfaces that can anticipate the user's intended actions. Human behaviour depends on highly developed abilities to perceive and interpret visual information and provides a medium for the next

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... ation of image retrieval interfaces. If the computer can correctly interpret the user's eye gaze behaviour, it will be able to anticipate the user's objectives and retrieve images and video extremely rapidly and with a minimum of thought and manual involvement.