Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2007-01-30
2007-01-30
Moore, David (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S003020, C358S003060, C358S003130, C358S003140, C358S003160, C358S003200
Reexamination Certificate
active
09571181
ABSTRACT:
A halftone threshold matrix includes a plurality of submatrices, wherein a first group of the plurality of submatrices has a line screen frequency different from a second group of the plurality of submatrices. The halftone method and apparatus removes the restriction that at most one pel is turned on per basic cell for the next constant input level and allows the pels in some basic cells to be turned on much sooner that the corresponding positions in other basic cells. This creates a dominant low frequency line screen simultaneously with the higher frequency line screen of the other basic cells. The present invention also allows the basic cells inside the threshold matrix to have different shapes and sizes. Thus, the cells participating in the low frequency screen could be larger than the cells generating the higher frequency screen. For example, the low frequency screen's pleasing patterns can distract the eye from noticing less pleasing patterns in the high frequency grid and vice versa.
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Russ, John C., The Image Processing Handbook, Second Edition, CRC Press, copyright 1995, p. 83.
Dittrich Danielle Kathryn
Mitchell Joan LaVerne
Qiao Yue
Chambliss, Bahner & Stophell, P.C.
Lynch David W.
Moore David
Thompson James A.
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