Banding noise reduction for clustered-dot dither

Details Banding noise reduction for clustered-dot dither Banding noise reduction for clustered-dot dither

1996-02-26

1999-02-23

Coles, Edward L.

Image analysis

Histogram processing

For setting a threshold

395102, 395109, 382162, 382167, 358457, 358535, B41B 1500, G06K 900, H04N 140, H04N 146

Patent

active

058752870

ABSTRACT:
The binary, on-or-off commands for a binary scan-line-oriented display are obtained by half-toning through the use of a dither matrix of the clustered-dot variety. But in "tiling" the display surface with the replicated dither matrix, successive columns of the dither matrices are offset from each other, in the direction transverse to the scan direction, by a fraction of the cluster-row spacing. This reduces the banding artifacts that otherwise result from non-uniform scan-line spacing.

REFERENCES:
patent: 5764862 (1995-12-01), Metcalfe et al.
patent: 5768411 (1996-02-01), Shu et al.

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