[54] METHOD FOR RECORDING COMPRESSED DATA
[75] Inventors: Samuel J. Wagner, Lilburn, Ga.; Brent D. Taft, New Concord, Ohio
[73] Assignee: Paul W. Martin, Dayton, Ohio
[21] Appl. No.: 866,613
[22] Filed: Apr. 10,1992
[51] Int. CL6 G06K9/36
[52] U.S. CI 382/119; 382/232
[58] Field of Search 382/3, 13. 56.
382/187, 119. 241, 243, 232; 340/705-707;
345/179, 180
[56] References Cited
U.S. PATENT DOCUMENTS
4,513,444 4/1985 Okaietal 382/56
4,542,412 9/1985 Fuse et al 382/13
4,550,438 10/1985 Convis et al 382/56
■ ■lllllllllllll
US005699445A [ii] Patent Number: 5,699,445 [45] Date of Patent: Dec. 16, 1997
4,758,979 7/1988 Chiao-Yueh 382/13
4,817,034 3/1989 Hardin, Sr. et al 382/13
4,969,201 11/1990 Tokasab et al 382/22
Primary Examiner—Leo Boudreau
Assistant Examiner—Chris Kelley
Attorney, Agent, or Firm—Paul W. Martin
[57] ABSTRACT
A method for recording compressed data which includes a perpendicular test as well as a parallel test for discarding handwritten data points relative to a series of guide lines. The parallel test determines whether a data point lies at a true distance within a predetermined threshold distance either side of the guide line. The perpendicular test determines whether the data point lies between two perpendicular lines through the end points of the guideline. Both tests must be satisfied before a data point is discarded. To save memory space, the guidelines are defined by an endpoint and a delta value. Error is maintained at a predetermined limit by adjusting the delta values prior to storage.
1 Claim, 15 Drawing Sheets
