High speed digital error diffusion process for continuous tone i

Details High speed digital error diffusion process for continuous tone i High speed digital error diffusion process for continuous tone i

1990-10-24

1992-12-15

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358461, 358462, 358463, 358443, 382 54, H04N 140

Patent

active

051722470

ABSTRACT:
The invention is a high speed error diffusion process consisting of repetitive computational cycles in which a binary print value is determined from an error-diffused pixel in a continuous tone image. In each cycle, the computation of the previous pixel error exploits computations made during the previous cycle. Specifically, for a continuous tone image consisting of n-bit pixels, the n least significant bits of the previous pixel error are computed during the previous cycle and its sign bit is determined during the current cycle. The n least significant bits of the previous pixel error are the n least significant bits of the error-diffused pixel of the previous cycle. The sign bit of the previous pixel error is determined during the current cycle from the three most significant bits of the error-diffused pixel value of the previous cycle and from the binary print value of the previous cycle.

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