Jeffrey B. Mulligan

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We performed a series of experiments examining the effect of contrast on the perception of moving plaids. This was done to test the hypothesis put forth by Adelson and Movshon (1982) that the human visual system determines the direction of a moving plaid in a two-staged process: decomposition into component motion followed by application of the intersection(More)
t When models of human vision adequately measure the relative quality of candidate half onings of an image, the problem of halftoning the image becomes equivalent to the search r o problem of finding a halftone that optimizes the quality metric. Because of the vast numbe f possible halftones, and the complexity of image quality measures, this principled(More)
We describe a system designed to monitor the gaze of a user working naturally at a computer workstation. The system consists of three cameras situated between the keyboard and the monitor. Free head movements are allowed within a three-dimensional volume approximately 40 centimeters in diameter. Two fixed, wide-field "face" cameras equipped with(More)
Video cameras provide a simple, noninvasive method for monitoring a subject's eye movements. An important concept is that of the resolution of the system, which is the smallest eye movement that can be reliably detected. While hardware systems are available that estimate direction of gaze in real-time from a video image of the pupil, such systems must limit(More)
1 flicker rates, but when the frequency is raised to 5-20 Hz, color flicker fusion occurs, where the e s flicker is seen as a variation of intensity only. Th ubject can eliminate all sensation of flicker by h p balancing the intensities of the two lights (at whic oint the lights are said to be equiluminant). When r c the intensities are not balanced, the(More)
The growth of digital video has given rise to a need for computational methods for evaluating the visual quality of digital video. We have developed a new digital video quality metric, which we call DVQ (Digital Video Quality)1.Here we provide a brief description of the metric, and give a preliminary report on its performance. DVQ accepts a pair of digital(More)
The sensitivity of the visual system to motion of differentially moving random dots was measured. Two kinds of one-dimensional motion were compared: standing-wave patterns where dot movement amplitude varied as a sinusoidal function of position along the axis of dot movement (longitudinal or compressional waves) and patterns of motion where dot movement(More)
We examined how the salience of color is affected by adaptation to different color distributions. Observers searched for a color target on a dense background of distractors varying along different directions in color space. Prior adaptation to the backgrounds enhanced search on the same background while adaptation to orthogonal background directions slowed(More)
f q A method is described for reducing the visibility of artifacts arising in the display o uantized color images on CRT displays. The method is based on the differential spatial senv sitivity of the human visual system to chromatic and achromatic modulations. Because the isual system has the highest spatial and temporal acuity for the luminance component(More)