Incremental printing of symbolic information – Thermal marking apparatus or processes – Gradational recording
Patent
1996-05-31
1998-11-10
Tran, Huan H.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Gradational recording
347188, 358455, 358456, 358465, 358466, B41J 2315, B41J 252
Patent
active
058351175
ABSTRACT:
A method and apparatus are described for employing non-uniform quantization to avoid marking dots within a region where there is inadequate control of marking density or color. The techniques are typically applied to dye transfer media used in thermal printers where the dye transfer media has a potential variance among lots. Dithering modifications are described for use with non-uniform quantization to provide control of color marking in areas where the energy input into a dye transfer medium results in an output that can vary between different lots of the transfer medium. Error diffusion may also be used with such non-uniform quantization.
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Robert W. Floyd and Louis Steinberg, "An Adaptive Algorithm For Spatial Greyscale," Proceeding of the S.I.D. vol. 17/2 Second Quarter 1976, pp. 75-77.
Robert Ulichney, "Digital Halftoning," The MIT Press, pp. 239-243.
Eastman Kodak Company
Noval William F.
Tran Huan H.
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