Abstract

Alphanumeric characters often appear distorted when displayed on cathode ray tube devices. These image distortions, referred to as "jaggies", result from undersampling the original high-resolution versions of the characters. To eliminate the aliasing errors that result from undersampling an image, one can filter out frequencies greater than the Nyquist limit - however practical limitation of the display device (gaussian pixel profile and limited intensity range) make the filtering less than ideal. (Kajiya, 1981) Additional image distortions occur because of a mismatch between the filters used to sample a high-resolution image (referred to as convolution kernels) and the pixel point-spread function of the monitor used to display the sampled and filtered image (referred to as the reconstruction kernel).

© 1989 Optical Society of America