High addressability error diffusion with minimum mark size

Details High addressability error diffusion with minimum mark size High addressability error diffusion with minimum mark size

1992-07-31

1994-12-20

Roskoski, Bernard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358447, 358455, 358448, H04N 140

Patent

active

053749979

ABSTRACT:
High addressability image signals, each representing a pixel in an image, where the signal has one of a relatively large number of signal levels, are directed through an error diffusion quantization process, for the conversion of the signal to one of a relatively small number of levels. Each signal is modified by a correspondingly weighted error correction term signal or signals from previously processed image signals, thereby generating a modified image signal. This modified image signal is compared to a threshold to derive a preliminary output signal having a smaller number of levels. The preliminary output signal is directed to an output if it has the same level as the previous output signal. If the preliminary output signal does not have the same level as the previous output signal, the preliminary output signal is directed to the output only if the previous output signal was one of a contiguous group of a preselected number of like level signals. Otherwise, the previous output value is directed to the output. The actual output signal is then compared to the modified input signal to derive an error signal for the diffusion feedback loop that maintains gray density.

REFERENCES:
patent: 4339774 (1982-07-01), Temple
patent: 4654721 (1987-03-01), Goertzel et al.
patent: 4924322 (1990-05-01), Kurosawa et al.
patent: 4955065 (1990-09-01), Ulichney
patent: 5025322 (1991-06-01), Ng
patent: 5045952 (1991-09-01), Eschbach
patent: 5221971 (1993-06-01), Allen et al.
patent: 5274472 (1993-12-01), Williams
An Adaptive Algorithm for Spatial Greyscale, Floyd and Steinberg, Proceedings of the SID, 17/2, 75-77 (1976).
A Survey of Techniques for the Display of Continuous Tone Pictures on Bilevel Displays, Jarvis et al, Computer Graphics and Image Processing, vol. 5, pp. 13-40 (1976).
MECCA-A Multiple-Error Correction Computation Algorithm for Bi-Level Image Hardcopy Reproduction, Stucki, IBM Research RZ1060 (1981).
On the Error Diffusion Technique for Electronic Halftoning, Billotet-Hoffmann et al., Proceedings of the SID, vol. 24/3 pp. 253-258 (1983).
Digital Halftoning on the IBM 4250 Printer, Goertzel et al, IBM J Res Develop, vol. 31, No. 1, Jan. 1987, pp. 2-15.

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