Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2007-09-24
2010-10-26
Poon, King Y (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S535000, C347S131000
Reexamination Certificate
active
07821672
ABSTRACT:
In a printer, threshold matrixes are prepared so that, in a color halftone image generated with the threshold matrixes, cell centers are arranged randomly, a direction where intervals of cell centers for cyan are maximum and a direction where intervals of cell centers for magenta are maximum are different, and the both directions are tilted relatively to a column direction corresponding to a scan direction of a head. A check pattern is recorded with the threshold matrix for each color component by the head, print densities in positions in a width direction of the check pattern, which corresponds to an arrangement direction of outlets in the head, are measured to acquire modification coefficients and then pixel values of an original image are modified by using the modification coefficients. This makes it possible to print a color halftone image with less graininess, without causing a beat pattern and streak unevenness.
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Dainippon Screen Mfg. Co,. Ltd.
McDermott Will & Emery LLP
Poon King Y
Tran Dung D
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