Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2006-02-07
2006-02-07
Grant, II, Jerome (Department: 2626)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S003060
Reexamination Certificate
active
06995873
ABSTRACT:
Apparatus and methods for flexible digital halftoning are provided in which novel pattern choices are allowed by not restricting the basic halftone patterns to grow sequentially. Rather, positions in a threshold array allow multiple transitions between on (i.e., printed with toner/ink) and off (not printed) as a function of the input value at the corresponding position. In one embodiment, multiple threshold matrices are employed and the output decision is a vote (e.g., exclusive OR) of the outputs of the individual threshold matrices. In another embodiment, each position contains an arbitrary bit vector to express the output for each input. In yet another embodiment, space efficiency may be achieved by sorting the arbitrary bit vectors into collections of adjacent decisions for a given input value, such as into bytes.
REFERENCES:
patent: 4926180 (1990-05-01), Anastassiou
patent: 5963714 (1999-10-01), Bhattacharjya et al.
patent: 6714318 (2004-03-01), Morris et al.
Crossland James F.
Mitchell Joan L.
Rijavec Nenad
Blakely , Sokoloff, Taylor & Zafman LLP
Grant II Jerome
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