Image processing circuit, gradation converting method, and...

Details Image processing circuit, gradation converting method, and... Image processing circuit, gradation converting method, and...

2011-03-01

2011-03-01

Coles, Edward L (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S521000, C358S001100, C358S001150, C358S518000, C382S167000, C382S272000, C382S278000, C382S162000, C382S254000

Reexamination Certificate

active

07898689

ABSTRACT:
An input gradation converting circuit has a gradation conversion table in which M-bit intermediate gradation data are correlated with each of N-bit input gradation data, and is operable to convert each of the input gradation data into the M-bit intermediate gradation data by using the gradation conversion table and output the converted M-bit intermediate gradation data. A diffusion gradation converting circuit is operable to convert each of the intermediate gradation data outputted from the input gradation converting circuit into N-bit output gradation data and output the converted N-bit output gradation data. The diffusion gradation converting circuit acquires a uniform random number Rnd in the range of −SFT/2 to SFT/2 and outputs [X+Rnd+0.5] as the output gradation data for each of the intermediate gradation data in which X obtained by dividing a value of the intermediate gradation data by 2M·Nand a specified value SFT satisfy a conditional expression “SFT/2≦[X]≦2N−1−SFT/2” (where [ ] is a Gauss symbol). The diffusion gradation converting circuit acquires a uniform random number Rnd′ in the range of 0≦[X+Rnd′+05]≦2N−1 and outputs [X+Rnd′+0.5] as the output gradation data for each of the intermediate gradation data in which the X and the specified value SFT do not satisfy the conditional expression.

REFERENCES:
patent: 4954889 (1990-09-01), Endo et al.
patent: 5123059 (1992-06-01), Hirosawa et al.
patent: 7099043 (2006-08-01), Miyagi
patent: 2006-197359 (2006-07-01), None

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