Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2000-05-16
2010-11-16
Thompson, James A (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S003010
Reexamination Certificate
active
07835034
ABSTRACT:
A halftone method and apparatus provides a line screen frequency of N/2 for a printer resolution of N without negative print effects. A 300 lines per inch halftone screen for a 600 dpi printer may thus be created by alternating white and saturated colored lines when half of a given color component's pels are on. Empirical rules are used to create the screens based on how that printer creates consistent and reliable levels for each color component. These rules allow intermediate intensity values between white and full-on at each pel. Since the halftoning is done in the hardware just before printing, the print direction relative to the threshold matrix is known. No rotation capability is needed in the hardware. If an image needs to be rotated, it can be done previously to being sent to the hardware. Furthermore, because a pair of pels are turned on for the lightest values (or possibly with a one level difference between the first and second dots in the pair), the electronics are stressed less. Moreover, the drive will be at a lower frequency than the first dot in the traditional halftone cell, which remains isolated for many levels.
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Theophano Mitsa and Kevin J. Parker, “Digital Halftoning Using a Blue Noise Mask”, IEEE, 1991, pp. 2809-2812.
Dittrich Danielle K.
Mitchell Joan LaVerne
Qiao Yue
Trenary Timothy James
Infoprint Solutions Company, LLC
Merchant & Gould
Thompson James A
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