Abstract

Anti-aliasing is typically necessary for the satisfactory display of binary imagery on color matrix displays (CMDs) in order to attenuate visible spatial aliasing which can degrade image quality. One useful anti-aliasing approach is the use of gray scale (luminance quantization) to apply a discrete approximation of a Gaussian point spread function to CMD images. By convolving a Gaussian blur function with an image, prior to the sampling of that image, perceptible spatial artifacts such as stairstepping of lines can be significantly reduced. This paper examines the unique forms of spatial aliasing introduced in stereoscopic imagery and their impact on chromatic and spatial image quality. One form of stereoscopic aliasing, depth aliasing, varies as a function of the discrete sampling limitations of the 2-D horizontal axis of the display. Another form of stereoscopic aliasing, noncorrespondence aliasing, is governed by the noncorrespondence of 2-D spatial sampling artifacts between left and right stereoscopic images and may be exacerbated by chromatic disparities as well. The results of subjective image quality evaluations of simulated 2-D and stereoscopic flat panel displays are presented here with recommendations for the use of gray-scale anti-aliasing for the display of binary stereoscopic graphic imagery.