Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-10-11
1994-07-19
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358458, 358298, H04N 121, H04N 140
Patent
active
053314301
ABSTRACT:
A system is disclosed for converting a continuous tone value to an output value having a first level or a second level. A first error magnitude is generated based upon continuous tone values already converted, continuous tone values not yet converted and an output value having the first level assumed for the continuous tone value undergoing conversion. A second error magnitude is similarly generated except that an output value having the second level is assumed for the continuous tone value undergoing conversion. If the first error magnitude is less than the second error magnitude, then the continuous tone value undergoing conversion is converted to the output value having the first level and, otherwise, the continuous tone value undergoing conversion is converted to the output value having the second level. The error corresponding to the converted lineary value is diffused in a predetermined manner to neighboring continuous tone values which have not yet been converted.
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Rodriguez Michael A.
Xie Zhenhua
Coles Sr. Edward L.
R.R. Donnelley & Sons Company
Rogers Scott A.
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