Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-04-17
1992-02-11
Boudreau, Leo H.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358447, 382 22, 382 54, 328114, 307517, H04N 514
Patent
active
050879723
ABSTRACT:
An image signal (Sij) from an original which gears image information is processed by generating a new image signal (S'ij) from the image signal (Sij). It is first determined whether the configuration of the distribution of the image signal (Sij) at a point of interest (i, j) is upwardly convex, or a downwardly convex, or otherwise. An image emphasis signal (S.sub.G ij) larger than the image signal (Sij) at the point of interest (i, j) is employed as the new image signal (S'ij) if the configuration is upwardly convex. An image emphasis signal (S.sub.L ij) smaller than the image signal (Sij) at the point of interest (i, j) is employed as the new image signal (S'ij) if the configuration is downwardly convex. The original image signal (Sij) or an unsharp signal (Uij), generated from the new image signal (S'ij), is employed as the new image signal (S'ij) if the configuration is otherwise.
REFERENCES:
patent: 3832577 (1974-08-01), Harr
patent: 4081836 (1978-08-01), Skihner
patent: 4319268 (1982-03-01), Yamada
patent: 4335407 (1982-06-01), Atoji et al.
patent: 4670793 (1987-06-01), Yamada et al.
Boudreau Leo H.
Fuji Photo Film Co. , Ltd.
Stellrecht Barry
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