Christopher D Shaver

US Patent:

53982975, Mar 14, 1995

Filed:

Jul 27, 1992

Appl. No.:

7/919871

Inventors:

Jeffery J. Clark - Tigard OR
Brian G. Crosby - Tualatin OR
Bo Lewendal - Beaverton OR
Christopher D. Shaver - Tigard OR
Gregory P. Thornton - Tigard OR
Patrick E. Welborn - Lake Oswego OR

Assignee:

Tektronix, Inc. - Wilsonville OR

International Classification:

H04N 123
H04N 146
G06F 1500
G01D 1510

US Classification:

358298

Abstract:

A system and method of printing an image on a substrate based on an input of detailed image intensity information for each of discrete pixel areas of the substrate, includes or performs steps of processing the detailed image intensity information into less detailed image intensity information; dithering the less detailed image intensity information to approximate the intensity resolution of the detailed image intensity information; and printing the dithered, less detailed, image intensity information onto the substrate. The system will use less memory space than a comparable system which prints directly from the detailed image intensity information, will minimize patterning effects, and will correct for artifacts which might otherwise be printed.

US Patent:

54286140, Jun 27, 1995

Filed:

Sep 26, 1990

Appl. No.:

7/589115

Inventors:

Christopher J. Shaver - Beaverton OR

International Classification:

H04L 708
H04J 324

US Classification:

370 941

Abstract:

A framer for a data receiver operates by anticipating particular variable data bits to be sent in a desired group of data, and framing the desired group of data in a received signal by detecting the anticipated data bits in predetermined bit positions therein. The invention is illustrated with reference to a packet-based paging system.

US Patent:

52434141, Sep 7, 1993

Filed:

Jul 29, 1991

Appl. No.:

7/737004

Inventors:

John C. Dalrymple - Portland OR
Patrick E. Welborn - Lake Oswego OR
Christopher D. Shaver - Tigard OR

Assignee:

Tektronix, Inc. - Wilsonville OR

International Classification:

H04N 146

US Classification:

358500

Abstract:

A color processing system is provided that specifies color in a standardized, perceptually uniform color space and resolves color differences between input and/or output devices. The color processing system utilizes a color mapping techniques to adjust the results of color mapping to fit the color gamut of the output device. The color processing system may be implemented as a color rendering dictionary in a PostScript. RTM. Level 2 interpreter. An additional feature involves adaptation of PostScript. RTM. Level 1 applications to take advantage of the improved color processing system and PostScript. RTM. Level 2 flexibility.