Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2008-04-01
2008-04-01
Haskins, Twyler L. (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S003060, C358S001900, C358S406000, C358S504000, C358S003230, C399S049000, C399S053000, C347S131000, C382S167000
Reexamination Certificate
active
07352492
ABSTRACT:
What is disclosed is a method for compensating for printer characteristics having a tone reproduction curve which is either too rough to be fitted by interpolation or which does not have a simple parametric function. The method comprising first placing a first set of control points on the tone reproduction curve such that each point is representative of the behavior of the curve in the vicinity of that point and fitting a first smoothed curve to the first set of control points. A subset of points belonging to the set of first control points along the first smoothed curve is moved, thereby indicating a desired change in that region of the curve of the original function. A second set of control points is generated from the set of moved first control points and the remaining unmoved first control points and a second smoothed curve is then fitted to the second set of control points. A differential function between the first and second fitted curves is then determined. This difference is added to the original curve to produce a smoothly modified last curve, which retains the original curve's characteristics.
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Haskins Twyler L.
Kassa Hilina S
Xerox Corporation
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