Cross-product filter

Details Cross-product filter Cross-product filter

1989-10-03

1991-06-11

Brinich, Stephen

Image analysis

Histogram processing

For setting a threshold

382 31, G06K 900

Patent

active

050239180

ABSTRACT:
Method and apparatus for filtering a sequence of digital values representative of endpoints of vectors which represent the stroke of a writing instrument on a writing tablet. The cross-product and dot-product of the vectors comprising the stroke are computed to produce a sample of points which are close together where the stroke curves sharply, and which are further apart where the stroke is substantially straight.

REFERENCES:
patent: 3993976 (1976-11-01), Ginsburg
patent: 4282511 (1981-08-01), Southgate et al.
patent: 4731859 (1988-03-01), Holter et al.
patent: 4837843 (1989-06-01), Owechko
patent: 4901358 (1990-02-01), Bechet

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