Display Flicker Reduction by Use of Anisotropic Filtering
Original Publication Date: 1985-Jan-01
Included in the Prior Art Database: 2005-Feb-18
A display flicker reduction by the use of anisotropic filtering modifies the technique for displaying characters with smooth contours, and is useful in suppressing flicker on displays having relatively low refresh rates. The anti-aliasing technique does display characters and geometric objects that appear to have smooth edges; however, an annoying flicker problem results due to the presence of character details on the order of one pixel (picture element) in height. An anisotropic filter for the low-pass filtering operation has a lower cutoff frequency in the vertical direction than in the horizontal direction. This removes or spreads out details of near one-pixel dimension, causing them to occupy several adjacent pixels.