04437122 is referenced by 177 patents and cites 2 patents.

The present invention enhances the resolution and quality of characters of a system receiving the information initially in the form of video display pixels and providing hard copy output. This is accomplished by storing at least three successive lines of video data in successive, parallel connected shift registers, applying the outputs of the shift registers to a decoder, and generating driving signals for the printer head. The decoder compares the pixels on the same line as well as in preceeding and succeeding lines that surround each specific input pixel to generate the printer head driving signals according to whether straight or curved line segments are to be formed. In effect, the printer increases the density of the information elements and simultaneously provides rounding off of character edges and smoothing of diagonals.

Title
Low resolution raster images
Application Number
6/303742
Publication Number
4437122
Application Date
September 12, 1981
Publication Date
March 13, 1984
Inventor
David E Halpert
Enfield
NH, US
Brian F Walsh
Etna
NH, US
Agent
Ronald F Chapuran
Assignee
Xerox Corporation
CT, US
IPC
H04N 5/14
H04N 1/38
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