Method of and apparatus for generating conversion curve employab

Details Method of and apparatus for generating conversion curve employab Method of and apparatus for generating conversion curve employab

1990-11-20

1992-05-26

Shoop, Jr., William M.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358456, 358 80, H04N 123

Patent

active

051172933

ABSTRACT:
On a conversion plane of image data, first through third points (Q.sub.H, Q.sub.S, Q.sub.D) are provided. The first and second points are determined in accordance with highlight and shadow points of an original image, respectively, while the third point is determined in accordance with a dummy shadow point of the original image. A conversion curve (C.sub.a, C.sub.b) is so determined as to pass through the first and second points and to extend along a straight line (L) connecting the first and third points in the highlight region of the coordinate plane.

REFERENCES:
patent: 4402015 (1983-08-01), Yamada
patent: 4833546 (1989-05-01), Numakura et al.
patent: 4924323 (1990-05-01), Numakura et al.
patent: 4956718 (1990-09-01), Numakura et al.

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