Method of and apparatus for image smoothing along a tangential d

Details Method of and apparatus for image smoothing along a tangential d Method of and apparatus for image smoothing along a tangential d

1989-12-06

1991-09-17

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 16, 382 22, 358448, G06K 940, G06K 948

Patent

active

050502271

ABSTRACT:
Smoothing in a tangential direction of a contour and detail enhancement in its perpendicular direction are simultaneously achieved with spatial filters having prescribed weighing factor distribution. An area including a contour is first designated, and a direction of the contour is detected. A weighted mean value of an image signal is computed with weighing factors distributed in the spatial filter. The weighing factors have an effect of smoothing in the tangential direction of the contour and an effect of detail enhancement in the perpendicular direction.

REFERENCES:
patent: 4124870 (1978-11-01), Schatz et al.
patent: 4691366 (1987-09-01), Fenster et al.
patent: 4724489 (1988-02-01), Oldershaw
patent: 4817174 (1989-03-01), Nakatani
patent: 4827533 (1989-05-01), Tanaka

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