Ink amount indicative signal correcting apparatus for reducing d

Details Ink amount indicative signal correcting apparatus for reducing d Ink amount indicative signal correcting apparatus for reducing d

1996-03-14

1998-06-16

Fuller, Benjamin R.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347 19, 347131, 347246, 347253, B41J 2385, B41J 29393, G03G 1501, G01D 1506

Patent

active

057678863

ABSTRACT:
An ink amount correction system is provided in a color image printer system for printing a full color image by mixing yellow, magenta, cyanogen and India ink amount signals. The ink amount correction system includes: a plurality of color ink amount correction circuits which include a quantization section for quantizing a color ink amount indicative signal representative of the amount of an ink of a predetermined color corresponding to each of picture elements of a primary color image; an error calculating section for calculating a quantization error between the input and output of the quantization section, to output as a quantization error signal; and a feedback correction section for adding the quantization error signal derived by the error calculating section, to the corresponding color ink amount indicative signal of the surrounding picture element, for correcting the ink amount indicative signal. The average value of the quantization error signal is added before the quantization of an ink amount indicative signal of a black ink having the maximum influence upon luminance. As a result, it is possible to reduce the dispersion of the degree of overlapping of inks for each of the picture elements to carry out the recording of good quality, in a case where a color image is printed by means of inks of a plurality of colors using error diffusion.

REFERENCES:
patent: 4803496 (1989-02-01), Kawakami et al.
patent: 5210602 (1993-05-01), Mintzer

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