Hong N Li

US Patent:

6839152, Jan 4, 2005

Filed:

Dec 6, 2000

Appl. No.:

09/731131

Inventors:

Zhigang Fan - Webster NY, US
Ying-Wei Lin - Penfield NY, US
Hong Li - Broomfield CO, US

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G06K 1500

US Classification:

358 308, 382260, 382264, 382274

Abstract:

An adaptive filtering method and apparatus for descreening a scanned halftoned image representation is disclosed. The apparatus includes an image input subsystem; a processing subsystem for processing halftoned image data provided by the image input subsystem; and software/firmware means operative on the processing subsystem for a) low-pass filtering a halftoned input pixel value provided by the image input subsystem to produce a low-pass filtered pixel value; b) notch-filtering the halftoned input pixel value to produce a notch-filtered pixel value; c) determining a local contrast value for the halftoned input pixel value; and d) producing a descreened output pixel value based on the low-pass filtered pixel value, the notch-filtered pixel value, or a combination of the low-pass filtered pixel value and the notch-filtered pixel value depending on the local contrast value.

US Patent:

7400430, Jul 15, 2008

Filed:

Sep 25, 2003

Appl. No.:

10/672234

Inventors:

Joseph Stanley Czyszczewski - Longmont CO, US
Hong Li - Boulder CO, US
Mikel John Stanich - Longmont CO, US
Gerhard Robert Thompson - Wappingers Falls NY, US
Chai Wah Wu - Poughquag NY, US

Assignee:

InfoPrint Solutions Company, LLC. - Boulder CO

International Classification:

H04N 1/58
G03F 3/08

US Classification:

358515, 358504, 358518

Abstract:

A method, computer program product and system for detecting and compensating for color misregistration. A black/white edge or a solid color edge on a target may be scanned. A black/white edge may refer to a black image, e. g. , black text, on a white surrounding background having a rapid spatial transition from black to white. A solid color edge may refer to a solid color image, e. g. , solid color text, on a white surrounding background having a rapid spatial transition from color to white. A curve of gray values versus spatial pixel positions for each color channel, e. g. , red, green and blue color channels, may be generated. A misregistration error may then be calculated by calculating the offset between the color channel curves. The misregistration error may then be used to calibrate the scanner to compensate for the detected color misregistration.

US Patent:

7545537, Jun 9, 2009

Filed:

Jul 29, 2005

Appl. No.:

11/193960

Inventors:

Hong Li - Boulder CO, US
Mikel John Stanich - Longmont CO, US
Gerhard Robert Thompson - Wappingers Falls NY, US
Chai Wah Wu - Poughquag NY, US

Assignee:

InfoPrint Solutions Company LLC - Boulder CO

International Classification:

G06K 15/00
H04N 1/405

US Classification:

358 306, 358 19, 358 32, 358 326, 358533, 358536

Abstract:

A multiple beam printer system having N laser beams receives print job information from a print host. A rendering application uses a threshold array to generate halftone image data from the print job. The threshold array is defined based on a spot function. The defined screen is non-orthogonal and includes Y pels in a direction that is perpendicular to a scanning direction of the laser beams where Y is an integer multiple of N. A distance between screen dots in pels is preferably equal to an integer multiple of N. The screen dot may be defined by a supercell encompassing two screen dots and having an odd number of pels in a direction that is parallel to the scanning direction. The spot function may include a snap feature that snaps a screen dot to the nearest printer grid pel. The spot function may include scaling to compensate for the distortion of the non-orthogonal screen dot.

US Patent:

7557964, Jul 7, 2009

Filed:

Mar 28, 2003

Appl. No.:

10/403971

Inventors:

Hong Li - Superior CO, US
Joseph Stanley Czyszczewski - Longmont CO, US
Mikel Stanich - Longmont CO, US

Assignee:

InfoPrint Solutions Company, LLC - Boulder CO

International Classification:

H04N 1/00
H04N 1/46

US Classification:

358406, 358405, 358504

Abstract:

Methods, systems, and media to calibrate a reprographic system are disclosed. Embodiments of the invention may calibrate a component like scanner and/or printer in response to user input and/or coupling the component to the reprographic system. More specifically, embodiments may generate a curve that describes tone differences between an image scanned by a scanner or an image printed by the printer by comparing the outputs to acceptable tone descriptions for the image. Some embodiments comprise a graphical user interface (GUI) to communicate with the user, allowing the user to select user preference curves to change, for example, the brightness of an image being copied. Some embodiments incorporate network and phone system interfaces to communicate with remote components as well as to receive input from and/or output to other systems via email, facsimile, etc.

US Patent:

7577900, Aug 18, 2009

Filed:

May 13, 2005

Appl. No.:

11/128864

Inventors:

Gary A. Passero - Penfield NY, US
Hong Q. Li - Rochester NY, US
Adzim Raja Auzar - Fairport NY, US

Assignee:

Harris Corporation - Melbourne FL

International Classification:

G06F 17/00

US Classification:

715200, 715249

Abstract:

A software data interface technique allows a program to retrieve data from another program, whether or not data formats employed by the two programs are mutually compatible. An application-independent data format, F, is a priori agreed upon and readable by creators of the two programs. In the course of storing data during execution of a first program, that data file is augmented to include instructions that convert the format of the data into the application-independent intermediate data format, F. During execution of the second program, whenever access of data stored in the first program is required, the second program retrieves from the first data file instructions for converting the format of the data to the application-independent intermediate data format, F. The second program then executes the conversion instructions so as to retrieve the data from the first program.

US Patent:

7599097, Oct 6, 2009

Filed:

Jun 10, 2005

Appl. No.:

11/149235

Inventors:

Hong Li - Superior CO, US
Mikel John Stanich - Longmont CO, US
Gerhard R. Thompson - Wappingers Falls NY, US
Chai Wah Wu - Poughquag NY, US

Assignee:

InfoPrint Solutions Company LLC - Boulder CO

International Classification:

G06K 15/00

US Classification:

358 306, 358 314, 358 303, 358 313

Abstract:

A method and system for generating halftone tables, using a spot function, subdivides the pixels within the halftone cell of a halftone matrix into a plurality of sub-pixels, determines the value of the spot function corresponding to the position of each of the sub-pixels within the halftone matrix, repeats the subdividing and determining for all of the sub-pixels in the halftone matrix, ranks the values for the entire halftone matrix, normalizes the ranked values, generates a cumulative histogram based upon the normalized values, and stores the cumulative histogram as a halftone table.

US Patent:

7599556, Oct 6, 2009

Filed:

Aug 25, 2005

Appl. No.:

11/212371

Inventors:

Joseph Stanley Czyszczewski - Longmont CO, US
Hong Li - Boulder CO, US

International Classification:

G06K 9/34
G06K 9/62
G06K 15/00

US Classification:

382173, 382105, 382168, 382224, 358 21, 358465

Abstract:

An apparatus, system, and method are disclosed for identifying content within a scanned document. The apparatus includes a modification module, an identification module, and a segmentation module. The modification module creates a modified content data set through application of a sigmoid function to a scanned content data set. The identification module identifies a content segment within the modified content data set. The segmentation module identifies a content segment type of the content segment. Exemplary content segment types include text, line art, and images.

US Patent:

7616347, Nov 10, 2009

Filed:

Apr 29, 2005

Appl. No.:

11/117426

Inventors:

Hong Li - Superior CO, US
Mikel John Stanich - Longmont CO, US
Gerhard R. Thompson - Wappingers Falls NY, US
Chai Wah Wu - Poughquag NY, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04N 1/405

US Classification:

358 306, 358 313

Abstract:

A method (and system) of multi-bit halftoning includes comparing values of an image to threshold values of a halftone threshold matrix, and generating output values that provide a greater than minimum level of contrast.