Digital pen and paper

Details Digital pen and paper Digital pen and paper

2005-04-21

2009-06-02

Strege, John B (Department: 2624)

Image analysis

Pattern recognition

On-line recognition of handwritten characters

C382S188000, C382S203000

Reexamination Certificate

active

07542607

ABSTRACT:
A digital pen and paper system comprises a pen arranged to make pen strokes on a document having a plurality of regions, to detect markings on the document, and to record them in a series of samples. The system is arranged to determine from the samples the position of the pen strokes. The system has defined therein a plurality of different warning conditions that determine when a warning will be produced in response to lost samples, and is arranged to select one of the warning conditions for one of the pen strokes depending on which of the regions the pen stroke is made.

REFERENCES:
patent: 4668963 (1987-05-01), Tanabe et al.
patent: 5627349 (1997-05-01), Shetye et al.
patent: 5943137 (1999-08-01), Larson et al.
patent: 6456740 (2002-09-01), Carini et al.
patent: 6573887 (2003-06-01), O'Donnell, Jr.
patent: 2002/0107885 (2002-08-01), Brooks et al.
patent: 2003/0029919 (2003-02-01), Lynggaard et al.
patent: WO 01/61636 (2001-08-01), None
patent: WO 03/042912 (2003-05-01), None

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