Information extraction by mapping

Details Information extraction by mapping Information extraction by mapping

1985-04-09

1988-04-05

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

364725, 382 23, 382 56, G06K 946

Patent

active

047364360

ABSTRACT:
An information extraction device including a coordinate transformation unit for transforming the coordinate values of points on a plane in question to the coordinate values of the points on a spherical surface corresponding to the points on the plane, and a mapping unit for mapping the points on the spherical surface to great circles. This information extraction device is applicable to the detection of the three-dimensional direction of a single line or a single plane existing in space.

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patent: 3952187 (1976-04-01), Robinson et al.
patent: 4241412 (1980-12-01), Swain
patent: 4276561 (1981-06-01), Friedman
patent: 4306296 (1981-12-01), Blaschke
patent: 4451856 (1984-05-01), Buechler
patent: 4489389 (1984-12-01), Beckwith et al.
patent: 4500972 (1985-02-01), Kuhn et al.

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