Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2005-02-08
2005-02-08
Rogers, Scott A. (Department: 2626)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S003130, C358S003140, C358S003190, C358S536000
Reexamination Certificate
active
06853467
ABSTRACT:
A method for performing a digital multistage screening of a continuous-tone image with a screen having any desired screen resolution and any desired screen angle, in which the screening is carried out by reading out threshold values and comparing the threshold values read out with the color values of the continuous-tone image. Threshold value matrices are used in which the threshold values represent one or more screen dots of a given screen, with which the desired screen resolution and the desired angle are approximated. While the threshold values are being read out, an error between the coordinates of the desired screen and of the given screen is determined, and the error is compensated for by correcting the read address for the threshold value matrix, as soon as the error exceeds a predefined limiting value. Instead of the threshold value matrices, printing-value matrices can also be used.
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Kerz Ludo
Wadle Heinrich
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Locher Ralph E.
Rogers Scott A.
Stemer Werner H.
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