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This article presents a simple technique that improves the quality of text displayed on text terminals. The technique uses a single chip which can be inserted into the video output stream of such terminals.
English (United States)
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Anti-Aliasing Characters Displayed by Text Terminals
This article presents a simple technique that improves the quality of text
displayed on text terminals. The technique uses a single chip which can be
inserted into the video output stream of such terminals.
Text terminals (such as the IBM 3270 series) are used to display text in which
each character consists of an array of points, each of which is either on or off.
The edges of such character appears jagged due to the jumps across row or
columns. If the display device can present points at different intensities, then the
"jaggy" effect can be avoided by smoothing the jump using intensity values
between white and black.
The jagged effect is due to the sampling of a sharp edge over a
fixed grid. The original edge contains frequencies higher than those
that can be faithfully reproduced by the samples (Nyquist's theorem).
This results in higher frequencies aliasing as lower ones; the
error is hence known as "aliasing". Low pass filtering of the signal
before sampling can remove the aliasing problem; this step is hence
known as "anti-aliasing".
The filtering of the image with a low-pass filter is equivalent to an averaging
process: the intensity of a sample is determined by the image brightness in the
near vicinity of the pixel (picture element). In the general case of graphic images,
this averaging has to be performed before the sampling. However, in the
restricted case of terminal text, averaging the sampled values of the characters
produces satisfactory results.