Brent Michael Bradburn

US Patent:

6415058, Jul 2, 2002

Filed:

Oct 27, 1998

Appl. No.:

09/181066

Inventors:

Randall E. Grohs - Eagle ID
Brent M. Bradburn - Boise ID

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06K 936

US Classification:

382239, 382224

Abstract:

A computer for compressing a digital image. The computer is operable to decompose a digital image into a set of tiles and to classify certain tiles from the set as being low detail tiles. The computer is further operable to transform each tile from the set of tiles into a series of basis function coefficients to represent the tile in the frequency domain. The computer is responsive to a tile having more than four different pixel values and classified as a low detail tile by transforming the tile into a first series of basis function coefficients. The first series of basis function coefficients includes only four coefficients that have a non-zero value.

US Patent:

6594385, Jul 15, 2003

Filed:

Oct 27, 1998

Appl. No.:

09/181031

Inventors:

Randall E. Grohs - Eagle ID
Brent M. Bradburn - Boise ID

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06K 900

US Classification:

382166, 358 115

Abstract:

A compression apparatus for compressing a digital image is disclosed and includes a decomposer, a transform encoder unit and a merge plane compressor. The digital image is converted by the compression apparatus into a set of tiles suitable for transform encoding. Each tile from the set is then compressed by converting the tile into a âmerge plane data stringâ and an associated âtransform encoded data stringâ. The merge plane data string describes only the spatial locations of the background pixels in the tile. The transform encoded data describes the tile in the frequency domain but without the spatial frequencies associated with the background pixels. One important use of the present invention is to compress digital images prior to transmitting the digital image to a printer for printing.

US Patent:

6707578, Mar 16, 2004

Filed:

Sep 20, 1999

Appl. No.:

09/399613

Inventors:

Brent M. Bradburn - Boise ID

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

H04N 121

US Classification:

358 307, 358 12

Abstract:

The method of the invention improves the presentation of pixel data images in output documents. The method is implemented by a pipeline of image processing actions which, among others, includes an edge evaluation step wherein neighborhoods of pixel data are examined to derive edge values that are indicative of an edge presence in the respective neighborhood. Each edge value is further indicative of the intensity of the edge. The edge evaluation action further determines scaling parameters which enable later distribution of a neighborhoods center pixel tone value to subpixels that are created during a scaling action of the center pixel.

US Patent:

6825953, Nov 30, 2004

Filed:

Feb 29, 2000

Appl. No.:

09/514963

Inventors:

Brent M. Bradburn - Boise ID

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06K 936

US Classification:

358 307, 358 306, 358 32

Abstract:

The invention provides a procedure that is applicable to various halftoning methods, which minimizes image distortion introduced by the halftoning process. The procedure involves maintaining specific relationships between the halftone pattern and the phase and resolution of the input image. Specifically, that the halftone pattern is designed such that it does not bias tone reproduction with respect to the location of the input image pixelsâeach input pixel should be given equal weight when filtered by the halftoning process. This suggests a 1 to 1 relationship between each pixel of the input image and the corresponding tone output produced by the halftoning process. The procedure results in improved print quality, manifested by avoidance of certain types of moirà which are commonly associated with halftoning, as well as improved reproduction of edges and image details.

US Patent:

6879721, Apr 12, 2005

Filed:

Jan 2, 2001

Appl. No.:

09/753170

Inventors:

Brent M. Bradburn - Boise ID, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06T005/20

US Classification:

382205, 382270, 382274

Abstract:

A pixel processing system receives a target pixel value and neighbor pixel values. The neighbor pixel values may correspond to eight neighbor pixels that surround a target pixel corresponding to the target pixel value. The pixel processing system determines a minimum value and a maximum value among the neighbor pixel values. If the target pixel value is less than the minimum value, then the pixel processing system increases the target pixel value. If the target pixel value is greater than the maximum value, then the pixel processing system reduces the target pixel value. In response to increasing the target pixel value, the pixel processing system may reduce the neighbor pixel values to maintain an average value. In response to reducing the target pixel value, the pixel processing system may increase the neighbor pixel values to maintain an average value.

US Patent:

7057774, Jun 6, 2006

Filed:

Sep 18, 2003

Appl. No.:

10/665966

Inventors:

Brent M. Bradburn - Boise ID, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

H04N 1/40

US Classification:

358 307, 358 306

Abstract:

The invention provides a procedure that is applicable to various halftoning methods, which minimizes image distortion introduced by the halftoning process. The procedure involves maintaining specific relationships between the halftone pattern and the phase and resolution of the input image. Specifically, that the halftone pattern is designed such that it does not bias tone reproduction with respect to the location of the input image pixels—each input pixel should be given equal weight when filtered by the halftoning process. This suggests a 1 to 1 relationship between each pixel of the input image and the corresponding tone output produced by the halftoning process. The procedure results in improved print quality, manifested by avoidance of certain types of moiré which are commonly associated with halftoning, as well as improved reproduction of edges and image details.

US Patent:

7813588, Oct 12, 2010

Filed:

Apr 27, 2007

Appl. No.:

11/796638

Inventors:

Brent M. Bradburn - Boise ID, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06K 9/36
G06K 9/46

US Classification:

382282

Abstract:

Embodiments of image processing are described that include receiving source image data including a range of values having endpoints, adjusting the source image data by treating at least one subset of endpoint data differently from data having midrange values, where adjusting the source image data is performed prior to compressing the source image data, and restoring a range of values between the endpoint data values after decompressing image data to maintain the midrange data values substantially unadjusted.

US Patent:

61780111, Jan 23, 2001

Filed:

Mar 24, 1998

Appl. No.:

9/046995

Inventors:

Qian Lin - Santa Clara CA
Brent M. Bradburn - Boise ID
Brian E. Hoffmann - Ranica BG, IT

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

H04N 1405

US Classification:

358 19

Abstract:

An Adaptive Image Resolution Enhancement Technology (IRET) process and apparatus is described to improve halftone imaging by changing ordered halftone screen resolution according to the content of the image and managing these changes based on image content. The Adaptive IRET halftoning technique maximizes the artifact reducing properties of coarser ordered screens, while minimizing the loss of rendered detail in image areas having high spatial frequency. IRET may utilize a mixture of any ordered halftone screen (e. g. clustered-dot dither, line screen, etc. ) to generate halftone dots with a number of levels, and any dispersed halftone screen to generate additional levels for the ordered halftone dots. For some printing technologies, it is preferable to minimize printing artifacts by generating coarser halftone screens, rather than finer halftone screens. Coarser screening, however, means that details in the image, text, and line art will not be rendered well.