Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1981-06-29
1984-09-18
Shaw, Gareth D.
Facsimile and static presentation processing
Static presentation processing
Attribute control
430 30, 382 50, 382 18, 364526, 358280, 358 80, H04N 146
Patent
active
044727364
ABSTRACT:
An original to be lithographically reproduced is classified according to density distribution into one of a plurality of classes established on the basis of various high quality standard printed reproductions by comparing the density distribution patterns of the original and the standard reproductions. The patterns indicate relative frequency of density values in the entire density range. After being classified, the original is reproduced utilizing a standard color separation tone curve for a scanner that corresponds to the compared and selected standard reproduction. Alternatively a reference tone curve based on a grey scale may be used with a correction according to the difference between the reference tone curve and the standard tone curve. Also the reference tone curve may be corrected with the difference between the original density distribution pattern and the selected standard density distribution pattern.
An apparatus for use in the processes is also disclosed.
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Chung, R., "A Statistical Method for Image Classification and Tone Reproduction Determination", Journal of Applied Photographic Engineering, 3:74-81, (1977).
Akiguchi Hisao
Kassu Shigeru
Otake Renji
Ushio Hideki
Adams Bruce L.
Burns Robert E.
Dainippon Ink and Chemicals Incorporated
Lobato Emmanuel J.
Malamud Ronni S.
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