Dither matrix, image processing method, storage medium,...

Details Dither matrix, image processing method, storage medium,... Dither matrix, image processing method, storage medium,...

2011-04-12

2011-04-12

Zimmerman, Mark K (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S001900, C358S003070, C358S003080, C358S003100, C358S003130, C358S003140, C358S003160, C358S003170, C358S003180, C358S003190, C358S003220, C382S162000, C382S167000, C347S010000, C347S011000, C347S012000, C347S014000, C347S019000

Reexamination Certificate

active

07924465

ABSTRACT:
A disclosed dither matrix is used in halftone processing for converting input image data having M input halftone levels into output image data having N (M>N>2) output halftone levels. In the halftone processing, a concentration type dither matrix is used as the dither matrix when an input halftone level is within a range of input halftone levels corresponding to an output halftone level that is lower than a predetermined threshold level T (N>T>1), and a dispersion type dither matrix is used as the dither matrix when the input halftone level is within a range of input halftone levels corresponding to an output halftone level that is equal to or higher than the predetermined threshold level T.

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