Image recording apparatus for representing a halftone by use of

Details Image recording apparatus for representing a halftone by use of Image recording apparatus for representing a halftone by use of

1993-06-04

1996-03-05

Reinhart, Mark J.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347253, H04N 121

Patent

active

054971802

ABSTRACT:
An image recording apparatus comprises an unequal interval quatization circuit for quantizing at an unequal interval an input multilevel image signal to prevent at least one signal having a tone level at which a recording density is unstable from being outputted, a circuit for calculating a difference between an unequal-interval-quantized signal and the input image signal, a buffer memory for temporarily storing the difference, a multiplexer for multiplying a recorded signal with a weight coefficient, an adder for adding a resultant signal from the multiplier to the input image signal, and a printer for recording an image, using the quantized signal as a record signal.

REFERENCES:
patent: 4803496 (1989-02-01), Kawakami et al.
patent: 4926251 (1990-05-01), Sekizawa et al.
patent: 5043809 (1991-08-01), Shikakura et al.
Toshiharu Kurosaura, et al. The Journal of the Institute of Television Engineers of Japan, A Multi level Algarithm for High Quality Digital Halftoning; vol. 44, No. 5, pp. 608/614; 1990.
Hiroaki Kotera; The Journal of The Institute of Television Engineers of Japan, Smoothing Effect in Gray Characteristics Using a Pseuda-Noise Method vol. 40, No. 11, pp. 1113/1119; 1986.

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