Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1996-05-31
1999-11-30
Rogers, Scott
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358502, 347 41, 347 43, G06K 1502, H04N 150, B41J 2145, B41J 221
Patent
active
059957158
ABSTRACT:
A method and apparatus for printing images wherein printing of individual dots is controlled by employing binary masks. M different complementary binary masks each having the form of a matrix of points occupying N rows and P columns are defined in such a manner that each of the N.times.P elements of a mask has a first binary value or a second binary value, each point of the matrix corresponding to an element having the first binary value in one mask and in one mask only. Each portion of the image is printed in M passes of the print head while using the M different masks in succession, such that during each pass, the print head scans a strip of the print medium, the same mask being used repetitively for each group of P columns and N rows, an image dot being released for printing during a pass when the corresponding element of the mask has the first binary value. The masks used are of sufficiently large dimensions to avoid perceptible repetitive patterns appearing, the elements having the first binary value being distributed therein in a manner that is pseudo-random and substantially uniform.
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Efficient Design of Large Threshold Arrays for Accurate Tone Reproduction, Pierre Lermant, published in IS& T's 48th Annual Conference Proceedings, May 7-11, 1995, by "The Society for Imaging Science and Technology".
Berche Stephane
Lermant Pierre L.
Wu Yifeng
Oce--Technologies B.V.
Rogers Scott
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