Image analysis – Histogram processing – For setting a threshold
Patent
1997-07-03
1999-10-05
Rogers, Scott
Image analysis
Histogram processing
For setting a threshold
382237, 358533, 358534, 358454, 358456, H04N 1405, H04N 150, G06K 1500
Patent
active
059637145
ABSTRACT:
A printer driver operates a printer capable of multiple dot-placement geometries or resolutions and multiple inks per color channel. It maps a continuous-tone cyan pixel-component value to continuous-tone light- and dark-cyan values, which it separately halftones to respective binary pixel values that respectively indicate whether an associated pixel will receive light- and dark-cyan ink dots. It similarly generates binary values that respectively indicate whether an associated pixel will receive light- and dark-magenta ink dots. In performing the halftoning, the driver separately performs error diffusion through different interleaved sub-images of the image to be printed so that the error-diffusion process is performed for images whose pixel geometry is that for which the process was designed even though the overall image's pixel geometry is not. The result is a modular, scaleable architecture, in which designs for one ink per channel and/or one dot-placement geometry can be adapted with minimal design effort to multiple inks and dot-placement geometries.
REFERENCES:
patent: 5014333 (1991-05-01), Miller et al.
patent: 5031050 (1991-07-01), Chan
patent: 5226096 (1993-07-01), Fan
patent: 5287195 (1994-02-01), Blumer
patent: 5394252 (1995-02-01), Holladay et al.
patent: 5455600 (1995-10-01), Friedman et al.
Ancin Hakan
Bhattacharjya Anoop K.
Shu Joseph S.
Rogers Scott
Seiko Epson Corporation
Watson Mark P.
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