Image forming apparatus capable of producing a pseudo half-tone

Details Image forming apparatus capable of producing a pseudo half-tone Image forming apparatus capable of producing a pseudo half-tone

1997-06-23

1998-09-08

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358475, H04N 140

Patent

active

058053050

ABSTRACT:
The present invention is intended to provide an image forming apparatus capable of representing a plurality of gradations by using dither patterns without increasing the pixels in the matrix. The dither patterns are stored in the storage circuit (14). The dither patterns have different numbers of ON bits corresponding to black pixels, and remaining dither patterns have the same number of ON bits which are different patterns. The dither patterns stored in the storage circuit (14) are matrix patterns which have gradation values determined in accordance with variations of gray levels which are caused by effects derived from adjacent pixels. Therefore, the gradation values of the dither patterns are determined according to the position of ON bits regardless of the same number of ON bits. The dither conversion circuit (12) converts multi-level image data to binary image data represented by the dither patterns. The image forming device (2) forms an image according to the binary image data and reproduces the gradations of the dither patterns.

REFERENCES:
patent: 4698778 (1987-10-01), Ito et al.
patent: 4926268 (1990-05-01), Ilawamura et al.

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