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Rafael Lim

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Publications by Rafael Lim (bibliography)

1991

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Barfield, Woodrow and Lim, Rafael (1991): Evaluation of Computer Graphics Techniques for the Design of Images for Human-Computer Interaction. In: Proceedings of the Fourth International Conference on Human-Computer Interaction 1991. pp. 83-87.

“A psychophysics study was performed to investigate the relationship between computer graphics rendering techniques and subjective ratings of realism for computer-synthesized images. By manipulating the lighting and shading characteristics of computer-synthesized images, 31 different variations of a standard image were created. The experiment task was to rate the realism of each computer-synthesized image in comparison to two standards; a wireframe image representing the low end of realism, and a picture of the real image, representing the high end of realism. The results indicated that smooth shaded images were perceived as significantly more realistic than a flat shaded image, while color-mapped images were perceived as significantly more realistic than images rendered without a color map. However, there were no significant differences in perceived realism as a function of one versus two point light sources or between one versus two specular highlights. These and other findings are used to evaluate the psychological validity of several mathematical analysis of shading information that are used to render realistic three-dimensional images.”

1990

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Barfield, Woodrow, Lim, Rafael and Rosenberg, Craig (1990): Visual Enhancements and Geometric Field of View as Factors in the Design of a Three-Dimensional Perspective Display. In: D., Woods, and E., Roth, (eds.) Proceedings of the Human Factors Society 34th Annual Meeting 1990, Santa Monica, USA. pp. 1470-1473.

“This study investigated the effect of providing visual enhancements to a three-dimensional (3D) perspective display on the observers ability to judge the azimuth and elevation which separated two computer-generated images. The 3D perspective scenes were modeled after displays presented previously by McGreevy and Ellis (1986) but with several visual enhancements designed to assist users in performance of the experiment tasks. The visual enhancements included: (1) the capability to rotate the perspective scenes in near real-time and, (2) the presentation of solid shaded objects in the computer-generated scenes. The results provide information on the magnitude of the errors which occur when observers are required to make directional judgements using perspective displays and on the effectiveness of several visual enhancements on the accuracy of directional judgements using a 3D perspective display.”

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