Banding noise reduction for clustered-dot dither

摘要

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.