orienta-tions. When asked to point at an object, subjects oriented their arm to position the fingertip on the line running from the target to the viewing eye. But this eye-target line shifts when the eyes translate with each new head orientation, thereby requiring a new arm pointing direction. We confirmed

-Computer Interaction (HCI) to athletic performance measurement. Current commercially available solutions are invasive, and require the user to don gloves [15] or wear targets [8]. This paper describes a noninvasive visual hand tracking system, called DigitEyes. We have demonstrated hand tracking at speeds of up to 10

Normal subjects were presented with a simple line drawing of a face looking left, right, or straight ahead. A target letter F or T then appeared to the left or the right of the face. All subjects participated in target detection, localization, and identification response conditions. Although

to the horizontal 0°and right 10°positions, and the eye coil was calibrated by having subjects fixate targets at 0°and right 10°with the head centered. Data were filtered at 90 Hz, sampled at 500 Hz, and stored in a computer for off-line analysis. Coil recordings were made in three patients (age range, 15-23 years

factor impairing pointing performance is deficient robustness of an eye tracker’s calibration. To facilitate pointing at standard-size menus, we developed a technique that uses dynamic target expansion for on-line correction of the eye tracker’s calibration. Correction is based on the relative change

Visual search requires sequences of saccades. Many studies have focused on spatial aspects of saccadic decisions, while relatively few (e.g., Introduction The effective performance of visual tasks requires saccadic eye movements to direct the line of sight to sequences of selected locations. Much

. Greatest selectivity is achieved with short exposure times and separated scan lines. Interlaced lines and long exposure times facilitate heat conduction into photoreceptors. A scanner is an attractive alternative for pulsed selective targeting, because both selective targeting and thermal photocoagulation

vision-based hand tracking system, called DigitEyes. Employing a kinematic hand model, the DigitEyes system has demonstrated tracking performance at speeds of up to 10 Hz, using line and point features extracted from gray scale images of unadorned, unmarked hands. We describe an application of our sensor

Abstract. As part of an investigation into real-world drawing, eye movements and eye^hand interactions have been recorded for twenty subjects of varying drawing experience drawing simple straight and curved lines and a square. Two modes of eye^hand behaviour were observed. In the first, named

with target distance. Corresponding changes in pupil diameter, as expected for the “near reflex”, were not observed with perspective stimuli. Consistent, directionally appropriate vergence changes, paralleling perception, were also made by most subjects during monocular viewing of a Necker cube, but there