Method and an apparatus for coding/decoding telewriting signals

Details Method and an apparatus for coding/decoding telewriting signals Method and an apparatus for coding/decoding telewriting signals

1983-06-28

1986-06-24

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

178 18, 382 3, 382 21, 382 59, G06K 900

Patent

active

045971013

ABSTRACT:
A difference vector indicating movement of a pen between two adjacent sampled points is divided into macro movement and micro movement components. The macro and micro components are coded independently of each other so as to provide effective coding. In the case of coding the difference vector, the magnitude of the difference vector is coded in accordance with the types of zones (zone number k) and relative pel address within the zone. In order to improve the coding efficiency, a zone number difference is used instead of the zone number. Furthermore, the direction of the difference vector is expressed by a quadrant which includes this difference vector. In order to further improve the coding efficiency, a quadrant number difference is used instead of the quadrant number.

REFERENCES:
patent: 3609685 (1971-09-01), Deutsch
patent: 3982165 (1976-09-01), Rich
patent: 3982227 (1976-09-01), Joynson et al.
patent: 4005400 (1977-01-01), Engdahl
patent: 4020463 (1977-04-01), Himmel
patent: 4298945 (1981-11-01), Kyte et al.
patent: 4317109 (1982-02-01), Odaka et al.

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