Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1990-04-27
1992-05-05
Fuller, Benjamin R.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358 75, 358300, 358459, 346 11, 346140R, H04N 1034, H04N 129, B41J 2205, B41J 221
Patent
active
051113023
ABSTRACT:
A method of gray scale printing of dots of one or more colors into pixels and in a controlled ordered sequence into a plurality of super pixels defined by a given number of said pixels, characterized in that: one or more levels of dot loading are used to achieve different values of gray level in a multiple-level gray table. This generic method is applicable to both ink jet and electrophotographic printing species of this invention.
In one electrophotograpic printing species of this invention, there is disclosed a method of electrophotographic color printing which includes mixing a plurality of colors in a single plane and in dot-next-to-dot (DND) pixels within a plurality of super pixels to produce a color image, whereby the sum of the multi-color dots printed in any super pixel is limited to the number of subdivided individual pixels therein, thereby assuring dot-next-to-dot (DND) always printing of said colors in a single plane. The above method further includes varying the area of each printed color dot within each pixel of a super pixel in order to control the gray scale of a printed color image.
Gray scale printing is achieved by controlling the selection of a gray table entry level number representative of one of several available entry level numbers corresponding to a plurality of different dot loadings for a corresponding plurality of differently printed super pixels.
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patent: 4672432 (1987-06-01), Sakurada et al.
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Byte Magazine, "Introduction to Image Processing Algorithms" by Dawson, p. 169 et. seq.
"Designer's Guide to Roster Image Printer Algorithms," by Dispoto et al., 1st Edition, Dec. 1986, Hewlett Packard.
Proceedings of the Society of Information Display, vol. 17/2 entitled "An Adaptive Algorithm for Spatial Gray Scale".
Bearss James G.
Chan C. S.
Nelson Terry M.
Fuller Benjamin R.
Hewlett--Packard Company
Rogers Scott A.
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