EGGH89: Eurographics Workshop on Graphics Hardware 1989
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Browsing EGGH89: Eurographics Workshop on Graphics Hardware 1989 by Subject "filtering or area sampling"
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Item VLSI Architecture for Anti-Aliasing(The Eurographics Association, 1989) Romanova, Claudia; Wagner, Ulrich; Richard Grimsdale and Wolfgang StrasserComputer-synthesized images exhibit the typical artifacts of raster displays, called alias ing, rastering, staircasing or the "jaggies". Display of an image on a raster CRT requires the sampling the two dimensional image signal I( x, y) to obtain a pixel-based description of intensity. Unfortinately, this sampling process treates the pixel as a mathematical point and the point sampling of an unfiltered object is never correct at any resolution. Aliasing effects (spatial and temporal) are due to undersampling of the image signal. Spatial aliasing occurs when images contain frequencies greater than one half the spa tial sampling frequency. Lines that should be straight appear jagged, very small objects may not be visible, portions of long thin objects may disappear.