System and method for redistributing error values from an error

Details System and method for redistributing error values from an error System and method for redistributing error values from an error

1994-08-03

1997-12-09

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358448, 358455, 382252, 382254, H04N 140

Patent

active

056966016

ABSTRACT:
A method and system implements a redistributive characteristic into an error diffusion process. A grey level value representing a pixel is received. A threshold circuit thresholds the received grey level value and generates an error value as a result of the threshold. A portion of the error value is diffused to adjacent pixels on a next scanline. All the error for a single pixel on the next scanline is accumulated. Since this accumulated error has a greater number of bits than can be stored in a buffer, a portion of the accumulated error is truncated and redistributed to a down stream pixel for inclusion in the downstream pixel's error accumulation process. The grey level value has a first resolution which corresponds to an original input resolution. In a high addressabilty environment, the received grey level value is interpolated to subpixel grey level values before thresholding.

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patent: 5402506 (1995-03-01), Schafer

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