Yihong X Xu

6976166, Dec 13, 2005

Feb 6, 2001

09/776680

Cormac Herley - Los Gatos CA, US
Yihong Xu - Marlborough MA, US

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

H04L009/00

713165, 713189, 380 54, 380200, 380201, 726 31, 726 32, 705 50, 705 51

The present invention is directed to methods and apparatus that partially encrypt an information data file. An exemplary method includes dividing the information file into a first file and a second file, wherein the second file includes content from the information file to preclude reconstruction of the information file using only the first file, and encrypting the second file. Additionally, the method provides for transmitting the first file and the encrypted second file from a first device to a second device.

7028902, Apr 18, 2006

Oct 3, 2002

10/262882

Yihong Xu - Marlborough MA, US

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

G06K 7/10

2354621, 23546201, 23546209, 235494

A barcode with enhanced visual quality may be used with an item such as a document. The barcode includes a background field having an embedded graphic. The background caries data related to the item. The embedded graphic may obscure some background data. A bar coding apparatus, system and a corresponding method involve two basic functions: encoding and decoding. The encoding function uses an encoding algorithm to generate the barcode. The graphic is then embedded onto the barcode and the thus-generated enhanced visually significant barcode is placed on the item. Decoding involves machine-reading the barcode using a decoding algorithm. The decoding algorithm can operate with or without an original bit map that was used to generate the graphic. The graphic may be enhanced in a manner that may make at least a portion of the encoded information within the graphic readable by a human.

7107453, Sep 12, 2006

Dec 1, 2000

09/728292

Jonathan Yen - San Jose CA, US
Gerald Q. Maguire, Jr. - Stockholm, SE
Chit Wei Saw - Cupertino CA, US
Yihong Xu - Marlborough MA, US

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

H04L 9/00
G09C 3/00
G09C 5/00
G06K 9/18
G06K 9/72
G06K 9/36

713180, 380 54, 382183, 382234

Systems and methods for generating and decoding authenticatable graphical bar codes are described. In one aspect, a corroborative signed message is generated from information to be encoded, and a base image is modulated with a graphical encoding of the signed message to produce a marked image. In another aspect, a signed message is extracted from a marked image based upon a comparison of the marked image and a base image. The extracted signed message is decoded to produce a decoded message. Information encoded in the marked image is extracted from the decoded message and authenticated.

20040012601, Jan 22, 2004

Jul 18, 2002

10/197568

Henry Sang - Cupertino CA, US
Yihong Xu - Sunnyvale CA, US

G09G005/00

345/581000, 715/530000, 345/634000

A method and system are disclosed for displaying a first image represented by a first set of data as a second image represented by a second set of data that is different than the first set of data, in which the first image is included in an electronic document. In accordance with exemplary embodiments of the present invention, the first set of data corresponding to the first image is received. The second set of data is produced by transforming the first set of data into at least one of a vector image representation and a textual description of the first image. The second image is substituted for the first image in the electronic document. An electronic link is established from the second image to the first image, such that the first image can be retrieved from a database using the second image.

20040089727, May 13, 2004

Oct 24, 2003

10/692610

Izhak Baharav - Palo Alto CA, US
Cormac Herley - Los Gatos CA, US
Yihong Xu - Marlborough MA, US
Jonathan Yen - San Jose CA, US
Timothy Harrison - Belmont CA, US
Doron Shaked - Haifa, IL
Avraham Levy - Kiryat-Tivon, IL
Angela Hanson - Eagle ID, US
Terry Mahoney - Boise ID, US

G06K019/06

235/494000

A barcode system for generating and decoding a barcode with visual significance. The barcode system of the present invention includes an encoding module for receiving a message and a logo and generating a visually significant barcode based on these inputs. A decoding module is also provided for receiving an acquired version of a visually significant barcode that may have been degraded in a typical document handling channel (e.g., through the printing, scanning, or copying process) and for recovering the message specified by the visually significant barcode.

6751352, Jun 15, 2004

May 25, 2000

09/579070

Izhak Baharav - Palo Alto CA
Cormac Herley - Los Gatos CA
Yihong Xu - Marlborough MA
Jonathan Yen - San Jose CA
Timothy Harrison - Belmont CA
Doron Shaked - Haifa, IL
Avraham Levy - Kiryat-Tivon, IL
Angela K. Hanson - Eagle ID
Terry P. Mahoney - Boise ID

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

G06K 900

382183, 382233, 382306, 23546201

A barcode system for generating and decoding a barcode with visual significance. The barcode system of the present invention includes an encoding module for receiving a message and a logo and generating a visually significant barcode based on these inputs. A decoding module is also provided for receiving an acquired version of a visually significant barcode that may have been degraded in a typical document handling channel (e. g. , through the printing, scanning, or copying process) and for recovering the message specified by the visually significant barcode.