Image recording device for recording multicolor images with dot

Details Image recording device for recording multicolor images with dot Image recording device for recording multicolor images with dot

1995-02-17

1998-07-28

Frahm, Eric

Facsimile and static presentation processing

Facsimile

Recording apparatus

358533, H04N 140, H04N 146

Patent

active

057869006

ABSTRACT:
An image recording method in which a head, in which a plurality of recording elements are arranged in the main scanning direction, is moved in the sub-scanning direction, one of densities and area rates of respective pixels being varied in accordance with image densities, respective colors of yellow,. magenta, cyan and black are combined so as to record multicolor images, the method including the step of: recording the respective colors in a pattern in which a dot pitch was randomly arranged only in the sub-scanning direction. Further, recording a color in a pattern in which a dot pitch was ordinarily arranged in the sub-scanning direction, and recording the other colors in a pattern, in which the dot pitch was randomly arranged only in the sub-scanning direction, could also be performed. The length of pixel of at least two colors in the sub-scanning direction, can be set to a different non-integer multiple with respect to the corresponding length of pixel of one other color (such as yellow), reducing color moire and graininess.

REFERENCES:
patent: 4958218 (1990-09-01), Katayama et al.
patent: 5297878 (1994-03-01), Saito et al.
patent: 5394252 (1995-02-01), Holladay et al.
patent: 5469266 (1995-11-01), Usami et al.
patent: 5494361 (1996-02-01), Sonoda
patent: 5548407 (1996-08-01), von Kienlin et al.
Y. Sonoda et al., "The Effects of a Pixel Layout on the Quality of Halftone Images Produced by Louver", 9th Int'l Congress on Advances in Non-Impact Printing Tech., Jp. Hardcopy '93, pp. 342-345.

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