Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1995-04-26
1998-04-28
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358457, 358456, 358465, 358429, 358455, 358458, 358459, 358466, 382270, 382272, G06F 1500, H04N 140, H04N 141, G06K 938
Patent
active
057456607
ABSTRACT:
An image rendering system, for generating discrete tone image data representing a continuous-tone image for rendering by a rendering device, the image rendering system includes a stochastic threshold array generating arrangement and an image data processing section. The stochastic threshold array generating arrangement generates a plurality of stochastic threshold arrays from a random seed pattern that have been subsequently optimized to reduce image artifacts in the rendering of tones. Each pattern is optimized to reflect (i) a selected trade-off between grain and possible mottle in the rendered image, (ii) distortions introduced by the rendering device in rendering an image defined by the pattern and an observer in viewing the image, and (iii) boundary effects so that the patterns, when tiled together, have optimal visual characteristics proximate their respective edges. The image data processing section processes the continuous tone image data in relation to the stochastic threshold arrays generated by the stochastic threshold array generating arrangement. The image data processing section may be used to either randomly tile, or tile in an ordered way, the stochastic threshold arrays over the continuous-tone image data and generates the discrete tone image data in response to correspondingly positioned pixels of the continuous-tone image data and threshold values of the stochastic threshold arrays.
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Kolpatzik Bernd W.
Thornton Jay E.
Coles Sr. Edward L.
Harris Tia M.
Polaroid Corporation
Sabourin Robert A.
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