Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Kennedy, PJ: AUTHOR [+2]
This article describes a cathode ray tube (CRT) which improves operator reading performance and a for the design of such typefaces.
describes a cathode ray tube (CRT) which
improves operator reading performance and a for the design of such
It is well
known that people read prose text faster when is
rendered in printed form (or hard copy) than when it presented on a
video display CRT. Human factors research that the design of the
typeface accounts for most this difference. To improve human
performance with CRT tasks an anti-aliased typeface is disclosed
herein can be viewed on an analog color display.
computer displays are "digital" or "bi-level" nature.
That is, a picture element (pixel) could be on or off and only at a
fixed location. One problem this is the phenomenon of "stair-steps"
on diagonal Another problem is that characters can only be from
lines of widths that are discrete multiples of pixels.
The method of
this disclosure allows the brightness of
individual pixels to be modulated. The brightness in turn, modulates
the size of the individual For example, Fig. 1 shows a brightness
profile of a horizontal line. The width of the line is over a
fraction of a pixel range by brightness This ability to vary the
width of a line the typeface designer to control the stroke width of
character to a very fine degree. The individual of an alphabet are
generated, either or hand drawn, to a size of two inches in Each
character is then digitized using a video The digitized data is