Method of and apparatus for establishing highlight and shadow de

Details Method of and apparatus for establishing highlight and shadow de Method of and apparatus for establishing highlight and shadow de

1989-03-31

1991-10-01

Orsino, Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358455, 358456, 382 54, H04N 140

Patent

active

050538888

ABSTRACT:
Highlight density (X.sub.H) (or shadow density) is established on the basis of a cumlative histogram (H(X)) of density of an original. Computed first are reference densities (X.sub.HR, X.sub.HL and X.sub.Hl -X.sub.Hn) associated with prescribed reference statistic values (Y.sub.HR, Y.sub.HL and Y.sub.Hl -Y.sub.Hn), respectively, and threshold values (W.sub.Hl -W.sub.Hn). Then, the reference density (X.sub.HR) is compared with a prescribed threshold density (X.sub.HS), and a difference (X.sub.Hi) concerning the reference density (X.sub.Hi) is compared with the threshold value (W.sub.Hi) in a procedure, to thereby select one of procedures for establishing the highlight density.

REFERENCES:
patent: 4792979 (1988-12-01), Nomura et al.
patent: 4924323 (1990-05-01), Numakura et al.
patent: 4956718 (1990-09-01), Numakura et al.

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