Method and apparatus for gradation reproduction of...

Details Method and apparatus for gradation reproduction of... Method and apparatus for gradation reproduction of...

2006-04-25

2006-04-25

Lee, Thomas D. (Department: 2624)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S001900

Reexamination Certificate

active

07034964

ABSTRACT:
An apparatus for gradation reproduction of a continuous tone image has a pseudo-random number adding section for adding pseudo-random numbers to input image data corresponding to a target pixel. A look-up table contains threshold values corresponding to and determined in accordance with gradation of the input image data. A conversion section converts the gradation of the input image data into multivalue data based on at least three values by using at least two of the threshold values contained in the lookup table. An error computation section computes an error between states of the gradation of the input image data before and after conversion thereof into multivalue data by the conversion section. An error diffusing section spreads the error computed by the error computation section to pixels neighboring the target pixel in accordance with preselected weight coefficients.

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K. Knox and R. Eschbach: “Threshold Modulation In Error Diffusion” Journal of Electronic Imaging vol. 2, No. 3, Jul. 1993, pp. 185-192 XP000394877 Bellingham.

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