04550438 is referenced by 34 patents and cites 8 patents.

A method for compactly storing and reproducing script and graphic data from a computer input device. The computer input device sends a time sequence stream of x,y coordinates indicating graphic character locations on the input device. The first coordinate point of the graphic data is stored. Subsequent points are buffered until a reversal in the coordinate magnitude direction is detected with regard to either coordinate axis. This point is taken as a sample point and terminates a buffered segment and starts a new buffered segment. Each segment of the graphic character is approximated by a circular arc segment which is retained by storing the horizontal displacement to the mid-point of the arc segment along with the x and y displacements to the ending point of the segment. The retained information is sufficient to reproduce the input script or graphic for display, print, or manipulation. This is accomplished by mathematically regenerating the arc segments in the same sequence as they were originally created.

Title
Retro-stroke compression and image generation of script and graphic data employing an information processing system
Application Number
6/393281
Publication Number
4550438
Application Date
June 29, 1982
Publication Date
October 29, 1985
Inventor
Martin A Reed
Rockville
MD, US
Paul J Grimm
Clarksburg
MD, US
Danny B Convis
Washington Grove
MD, US
Agent
Douglas H Lefeve
John W Henderson Jr
Assignee
International Business Machines Corporation
NY, US
IPC
G06K 9/48
View Original Source