Image processing method utilizing error diffusion technique

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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358465, 382252, H04N 1405

Patent

active

055195091

ABSTRACT:
The present invention provides a half-tone image processing method utilizing an error diffusion technique which allows for the density adjustment of a half-tone image to be reproduced. When the density of an object pixel is converted into binary-coded data, a binary-coding object value is first calculated by adding a density value of the object pixel to an error sum of binary-coding errors distributed to the object pixel from peripheral pixels around the object pixel. Then, the binary-coding object value is compared with a threshold value TH for judging whether the object pixel is a black pixel or a white pixel. The binary-coding object value is also compared with a reference value GSLVB or GSLVW which can be variably set for the calculation of a binary-coding error HG of the object pixel. The level of the binary-coding error HG can be adjusted by variably setting the reference values GSLVB and GSLVW. Thus, the density adjustment of a half-tone image can be realized.

REFERENCES:
patent: 4958238 (1990-09-01), Katayama et al.
patent: 5014333 (1991-05-01), Miller et al.

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