Paul A Mcmanus

US Patent:

54791863, Dec 26, 1995

Filed:

Feb 11, 1991

Appl. No.:

7/653741

Inventors:

Paul A. McManus - Sherwood OR
Robert J. Beaton - Beaverton OR

Assignee:

Tektronix, Inc. - Wilsonville OR

International Classification:

G09G 100

US Classification:

345 11

Abstract:

A video monitor color control system including means for calibrating the intensity response of CRT phosphor sets to each of a plurality of electron gun control levels. Provided is a processor (24) that generates a sequence of discrete DAC signals, each DAC signal identifying an electron gun and a DAC value for driving the electron gun at a selected control level. Also provided is a monitor driver (22) connected to the processor (24) and to the monitor (20) and controllable in response to a DAC signal for driving the electron gun identified by the DAC signal at the control level identified by the DAC signal. The driven electron gun excites the associated phosphor set. A sensor (28) is provided for detecting the luminous intensity level of the phosphor excited by the electron gun, and for converting the detected intensity into a representative signal. The processor (24) receives for each discrete DAC signal the representative signals produced by the sensor and generates a look-up table for each gun defining intensity levels for each of the plurality of electron gun control levels.

US Patent:

46707808, Jun 2, 1987

Filed:

May 28, 1985

Appl. No.:

6/737765

Inventors:

Paul A. McManus - Sherwood OR
Gregory L. Hoffman - Beaverton OR

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

G03F 308
H04N 146

US Classification:

358 80

Abstract:

A method for matching hardcopy colors to display colors for registered-dot ink-jet copiers. Video RGB (red-green-blue) is converted into chromaticity coordinates in XYZ color space. An explicit solution is achieved by defining a new MSW color space which restricts the hardcopy colors to some percentage of one of the binary mixtures (M) of inks, some percentage of one of the single (S) inks, and some percentage of paper white (W). The color data in XYZ space is converted to MSW space and unreachable display colors are mapped into reachable hardcopy colors. Correction for hardcopy non-linearities is accomplished by using coverage ratios to correct for color shifts due to interaction among the inks. The MSW values are then converted to CMY (cyan-magenta-yellow) values which are processed in accordance with an appropriate dithering algorithm for conversion into dots for printing on paper.

US Patent:

49858530, Jan 15, 1991

Filed:

Mar 20, 1989

Appl. No.:

7/325428

Inventors:

Joann M. Taylor - Beaverton OR
Paul A. McManus - Sherwood OR
Gerald M. Murch - Portland OR
Roxanna F. Rochat - Beaverton OR
Novia A. Weiman - Beaverton OR

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

G06F 15626

US Classification:

364521

Abstract:

A method and apparatus for reversibly transforming color, which is selected from a gamut of colors producible by the primaries of a color display device (20), into a perceptually uniform color space. The coordinates of the color space are readily convertible into internationally accepted standards for color measurement. Also provided, is a method for transforming the color space coordinates of a selected color into the corresponding relative primary intensity levels of the display device (20).

US Patent:

47393742, Apr 19, 1988

Filed:

Feb 27, 1987

Appl. No.:

7/019982

Inventors:

David L. Mead - Sherwood OR
Paul A. McManus - Sherwood OR
Donald R. Titterington - Tualatin OR
Joern B. Eriksen - Oregon City OR
Michael D. Jones - Portland OR

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

G03B 2754
G03B 2772

US Classification:

355 67

Abstract:

A color image copying system (10) includes a light modulator (12) that receives incident light rays emanating from a source (14) of light. The light modulator comprises a light dispersing apparatus (54) that disperses different wavelengths of the incident light rays to different locations on a focal surface (60). A filter mask (68) aligned with the focal surface transmits preselected wavelengths of the ultraviolet light and blocks light of all other wavelengths. Each of a set of light valves (86, 88, 90) receives a different wavelength of light transmitted by the filter mask and intensity modulates it in accordance with image pixel information provided by an information source (16). An optical focusing apparatus (56) focuses the intensity-modulated wavelengths of light to a relatively small location (20) on an image focal surface (22) which is aligned with a light-sensitive medium (24). The light focused at the location exposes the light-sensitive medium to each of the wavelengths of light for a particular period of time determined by the image pixel information.

US Patent:

48750328, Oct 17, 1989

Filed:

Oct 26, 1987

Appl. No.:

7/113022

Inventors:

Paul A. McManus - Sherwood OR
Robert J. Beaton - Beaverton OR

International Classification:

G09G 128

US Classification:

340703

Abstract:

The colorimetric parameters of a color sample (42) that is illuminated by a reference light are processed for reproduction by a video monitor (20) or the like. A color filter assembly (40) and associated sensor (28) are used to generate signals indicative of the colorimetric parameters of the illuminated color sample (42). A computer (24) transforms the signals into a form suitable for driving a video monitor (20) to reproduce the color sample (42) on the monitor screen.

US Patent:

48435732, Jun 27, 1989

Filed:

Oct 26, 1987

Appl. No.:

7/113029

Inventors:

Joann M. Taylor - Beaverton OR
Paul A. McManus - Sherwood OR
Gerald M. Murch - Portland OR
Roxanna F. Rochat - Beaverton OR
Novia A. Weiman - Beaverton OR

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

G06F 15626

US Classification:

364521

Abstract:

A method and apparatus for reversibly transforming color, which is selected from a gamut of colors producible by the primaries of a color display device (20), into a perceptually uniform color space. The coordinates of the color space are readily convertible into internationally accepted standards for color measurement. Also provided, is a method for transforming the color space coordinates of a selected color into the corresponding relative primary intensity levels of the display device (20).