Paul H Dillinger, 82702 North Ave, Escondido, CA 92026

6933949, Aug 23, 2005

Feb 26, 1997

08/806355

Timothy M. McDonough - Escondido CA, US
Paul H. Dillinger - Escondido CA, US

Hewlett-Packard Company - Palo Alto CA

G06T011/40

345591

A computerized method, containable in a computer memory device, is disclosed for tristimulus color space coordinate data nonlinear storage, retrieval, and interpolation, and, more specifically to memory mapping and data interpolation for 24-bit L*H*C* to 24-bit RGB color mapping (three 8-bit words to each coordinate). Predetermined output tristimulus color space coordinate data points are stored in nodes of a memory construct based upon use of input values of a cylindrical-based tristimulus color space coordinate system, where a non-linear selection of stored data points is provided in the memory construct. The number of linear interpolations of each of the coordinates is determined by the number of available bits in each data word after providing sufficient bits to address the surrounding stored nodes. Each coordinate conversion is expedited by caching frequently accessed nodes in an auxiliary cache memory, by node doubling of preselected nodes, and by fetching only relevant adjacent nodes during interpolation.

5473446, Dec 5, 1995

Jan 27, 1994

8/189541

Alexander Perumal - Poway CA
Paul H. Dillinger - Escondido CA

Hewlett-Packard Company - Palo Alto CA

H04N 164

358523

Provided is a system and method for selectively enabling a printer to deposit on a sheet cyan, magenta, yellow and black (C,M,Y and K) primary or black color dots at each of the plurality of pixel locations to produce a color image. The system comprises a memory for storing C, M, Y and K values for each pixel in the color image and a processor for controlling selective deposition of the C, M, Y and K colors. The system includes a memory for holding a color vector for each pixel, respectively in the color image; a memory for storing parameters of a dither cell; and a processor coupled to the memory for comparing the dither cell with each color vector, to select a color component to print at the corresponding pixel location based on the comparison. The system provides a halftoning technique that produces print quality near error diffusion quality with the speed of a dither by dithering on a color vector. The replacement of black and secondary colors by the system produces better print quality than other dither techniques.

5377024, Dec 27, 1994

May 4, 1992

7/878931

Paul H. Dillinger - Escondido CA

Hewlett-Packard - Palo Alto CA

H04N 146

358502

The invention is for use with a visible medium capable of light reflection etc. , and for use with a color-image source that defines a desired color. Here a device for causing the medium to appear colored includes a gray-scale subsystem to achromatically suppress a stated fraction of the reflection; and at least two device-primary subsystems to cause selective reflection of light of two associated device-primary colors. Even if the device, as originally made, in effect uses the gray-scale subsystem to help construct colors, or the device-primary subsystems to help form gray-scale "values", such cross-dependency is essentially removed. A programmed processor resolves the desired-rendition information into Fraction-Black, Fraction-Colorant, and hue. Fraction-Black information is applied exclusively to control only the gray-scale subsystem; Fraction-Colorant to control only the device-primary subsystem; and hue to select a dominant and a subordinate primary subsystem and as between them apportion the Fraction-Colorant.

5917994, Jun 29, 1999

Aug 11, 1997

8/909747

Alexander Perumal - Poway CA
Paul H. Dillinger - Escondido CA

Hewlett-Packard Company - Palo Alto CA

H04N 152
H04N 156
H04N 160

395109

This system selectively enables a printer to deposit primary or black color dots at pixel locations on a sheet to produce a color image--in such a way as to increase the overall number of dots used in the image, thereby minimizing contrast between dots on the sheet and adjacent areas and so providing a better simulation of a continuous-tone image. The result is print quality often near that of error diffusion, usually better than any dither technique, but with the greater speed of a dither technique. The system includes a memory for storing a first color vector for each pixel in the image, respectively, and a processor coupled to the memory for determining a second color vector from each of the first vectors, respectively. The processor accomplishes this determination by replacing a fraction of the black color component of the first vector with primary colors. Preferably the processor also removes from the first color vector a quantity of white, in conjunction with the black replacement; in this case the processor sets the fraction of the black component to a value between zero and one inclusive, depending on the quantity of white that is available, in the first color vector, for removal.

5883632, Mar 16, 1999

May 3, 1994

8/238137

Paul H. Dillinger - San Diego CA

Hewlett-Packard Company - Palo Alto CA

G06T 500

345431

Device-space color specifications for two color-presentation devices are interrelated through the intermediary of at least one perceptual color space. This interrelation is performed by either tabulations or real-time software processing, and in such a way that color, and color changes, specified in relation to one device--in a control language of that device--are tracked in both the language and the actual performance of the other device. This mapping through perceptual space can be used to produce the effect of matching the two device gamuts to each other, so that the full gamuts of both are in effect merged. When so used, this new kind of mapping preserves relative positions in color space--and thus the capability of the tracking device to maintain distinctions between colors seen on the source/input device that appear very closely similar. Such discrimination between adjacent colors can be supported essentially throughout the gamut of both devices and in particular even very near the lightness extrema and maximum-saturation point on a hue page. A related technique of merging two- or three-dimensional color elements can be used either to implement the new mapping, or for very different purposes such as converting colors from perceptual into machine space.

5510910, Apr 23, 1996

May 3, 1994

8/238118

Francis E. Bockman - San Diego CA
Paul H. Dillinger - San Diego CA

Hewlett-Packard Company - Palo Alto CA

H04N 146

358502

A technique of merging or "matching" hue pages of a CRT and printer is used to map CRT control signals through a common perceptual space into printer control signals. The system (1) receives a color specification expressed as CRT control signals, (2) locates the specified color within the CRT perceptual gamut, (3) normalizes the two gamuts in perceptual space, (4) determines the relative position of the same color in the normalized CRT gamut, (5) declares that position to be the relative position of that color in the normalized printer gamut as well, (6) unfolds the normalization to determine the absolute position of the color in the actual printer gamut, (7) expresses that position in terms of printer-control signals, and then (8) applies those signals to the printer, to print the specified color. As a result that color, and color changes, specified in terms of CRT control signals are tracked in terms of both printer control signals and actual printer performance. The two device gamuts are in effect mapped to each other; the full gamuts of both are in effect merged.

5657137, Aug 12, 1997

May 10, 1995

8/438294

Alexander Perumal - Poway CA
Paul H. Dillinger - Escondido CA

Hewlett-Packard Company - Palo Alto CA

H04N 154

358502

This system selectively enables a printer to deposit primary or black color dots at pixel locations on a sheet to produce a color image--in such a way as to increase the overall number of dots used in the image, thereby minimizing contrast between dots on the sheet and adjacent areas and so providing a better simulation of a continuous-tone image. The result is print quality often near that of error diffusion, usually better than any dither technique, but with the greater speed of a dither technique. The system includes a memory for storing a first color vector for each pixel in the image, respectively, and a processor coupled to the memory for determining a second color vector from each of the first vectors, respectively. The processor accomplishes this determination by replacing a fraction of the black color component of the first vector with primary colors. Preferably the processor also removes from the first color vector a quantity of white, in conjunction with the black replacement; in this case the processor sets the fraction of the black component to a value between zero and one inclusive, depending on the quantity of white that is available, in the first color vector, for removal.

5537228, Jul 16, 1996

Nov 14, 1994

8/338291

Paul H. Dillinger - Escondido CA

Hewlett-Packard - Palo Alto CA

H04N 146
G03F 308

358502

The invention is for use with a visible medium capable of light reflection etc. , and for use with a color-image source that defines a desired color. Here a device for causing the medium to appear colored includes a gray-scale subsystem to achromatically suppress a stated fraction of the reflection; and at least two device-primary subsystems to cause selective reflection of light of two associated device-primary colors. Even if the device, as originally made, in effect uses the gray-scale subsystem to help construct colors, or the device-primary subsystems to help form gray-scale "values", such cross-dependency is essentially removed. A programmed processor resolves the desired-rendition information into Fraction-Black, Fraction-Colorant, and hue. Fraction-Black information is applied exclusively to control only the gray-scale subsystem; Fraction-Colorant to control only the device-primary subsystem; and hue to select a dominant and a subordinate primary subsystem and as between them apportion the Fraction-Colorant.