Appeal No. 1997-2896
Application 08/340,561
of the pen and producing an anti-aliased image of the pen’s
path on the display of the computer. On page 8 of Appellants’
specification, the system for implementing the method is
described as comprising a digitizer, a frame buffer and a
processor all connected to a bus. There is a display and a
tablet which overlays the display. The digitizer is connected
to the tablet and measures the position of the pen (stylus) on
the tablet, and the frame buffer drives the display. The
processor receives the measurements from the digitizer and
provides display data to the frame buffer. The frame buffer
then drives the display to draw lines or curves at positions
corresponding to the pen's path. The method of producing the
anti-aliasing images is described starting on page 9 of
Appellants’ specification. The method involves decomposing
the pen’s stroke into line segments. The pen stroke is then
drawn as distinct line segments. The end points of each
adjacent line segment are overlapped, thus ensuring that there
is a one pixel overlap between line segments. This
overlapping overcomes gaping between line segments. Further,
Appellants describe on pages 2 through 4 and 10 through 12 of
the specification, that a technique is used to adjust the
2
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