Image processor for an improved tone level expression

Details Image processor for an improved tone level expression Image processor for an improved tone level expression

1992-10-23

1995-01-17

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358457, H04N 140

Patent

active

053830334

ABSTRACT:
An image processor comprises means for determining generation of a dot by a dither method when an inputted data is a low gray level region not larger than a first threshold, means for generating a dot and distributing an error in a peripheral area when the inputted data is in a high gray level region larger than a second threshold, and means for generating a dot and distributing an error in a peripheral area when the inputted data is in a region higher than an intermediate gray level region larger than the first threshold and not larger than the second threshold, and for generating no dot and distributing an error the portion by which the inputted data exceeds the first threshold in a peripheral area as error, so that different tone level processing is performed in accordance with the gray level of the inputted data.

REFERENCES:
patent: 4701806 (1987-10-01), Takashima
patent: 5081691 (1992-01-01), Chesley
patent: 5134666 (1992-07-01), Imao et al.
J. C. Stoffel et. A Survey of Electronic Techniques for Pictorial Image Reproduction IEEE Transactions on Communications vol. Com-29, No. 12, Dec. 1981.

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