Jonathan U Yen, 38Plainfield, IL

6655592, Dec 2, 2003

Oct 10, 2001

09/975278

Doron Shaked - Sunnyvale CA
Avi Levy - Tivon, IL
Jonathan Yen - San Jose CA

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

G06K 710

23546201, 235494

Systems and methods of graphically demodulating a graphical bar code (i. e. , an image that contains inconspicuous graphical modulations that encode information embedded in an original base image) are described. The graphical bar code may be graphically demodulated automatically without foreknowledge of the original unmodulated base image, but rather based upon a base image that is derived based upon intrinsic features of the graphical bar code.

6722567, Apr 20, 2004

Jun 7, 2001

09/877516

Doron Shaked - Haifa, IL
Avraham Levy - Tivon, IL
Jonathan Yen - San Jose CA

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

G06K 710

23546201

Systems and methods for automatically generating and decoding a graphical bar code (i. e. , an image that contains inconspicuous graphical modulations that encode embedded information) are described. In one aspect, an invertible graphical operation is applied between regions of a base image and information-encoding graphical templates that are selected from a predefined template set to produce a graphical bar code with regions from which graphical templates are recoverable by applying an inverse graphical operation between graphical bar code regions and corresponding base image regions. In another aspect, an invertible graphical operation is applied between regions of a graphical bar code and corresponding regions of a base image to produce a set of measurement blocks, and information-encoding graphical templates corresponding to the set of measurement blocks with the highest estimated probability is selected from a predefined template set.

6724945, Apr 20, 2004

May 24, 2000

09/578251

Jonathan Yen - San Jose CA
Daniel R. Tretter - Palo Alto CA
Truong-Thao Nguyen - Fort Lee NJ

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

G06K 940

382274, 348246, 382167, 382199, 382260, 382275, 382300

Systems and methods of correcting one or more defect pixels in a source image are described. The source image is formed from a plurality of pixels each having a respective value. In one scheme, a defect pixel is corrected based upon curvature information computed from pixel values located near the defect pixel. In another scheme, a median pixel value is determined from values of pixels located near a defect pixel, and the defect pixel is corrected based upon the median pixel value.

6742708, Jun 1, 2004

Jun 7, 2001

09/877517

Doron Shaked - Haifa, IL
Avi Levy - Tivon, IL
Jonathan Yen - San Jose CA
Chit Wei Saw - Cupertino CA
Clayton Brian Atkins - Mountain View CA

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

G06K 710

23546201, 23546204, 23546208, 235494, 23546215

Fiducial mark patterns for graphical bar codes (i. e. , images that contain inconspicuous graphical modulations that encode embedded information) that are characterized by high detection robustness and good local deformation tracking are described. In one bar coding method, a base image is modulated with a graphical encoding of a message to produce a graphical bar code, and a fiducial mark pattern comprising a plurality of dots arranged to track one or more reference locations and local deformation across the graphical bar code is generated. In another bar coding method, fiducial mark candidates are identified in a fiducial mark pattern, a fiducial mark path is computed based upon one or more of the identified fiducial mark candidates, and one or more reference locations are identified based upon the computed fiducial mark path.

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.

6839450, Jan 4, 2005

Apr 26, 2001

09/844324

Jonathan Yen - San Jose CA, US
Daniel Tretter - Palo Alto CA, US
Ron Kimmel - Haifa, IL

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

H04K 100

382100, 358 328

Systems and methods of detecting halftone modulations that are embedded in an image are described. The halftone modulations represent an ordered sequence of digital halftone microscreens that encodes information that has been embedded in the image. In one embodiment, the embedded information is detected by applying a respective matched filter to the image for each of two or more different halftone modulations to identify the ordered sequence of halftone modulations embedded in the image. This approach provides an effective, robust and efficient scheme for detecting such halftone modulations without knowledge of the original image before halftone modulation.

6895116, May 17, 2005

Jun 7, 2001

09/877581

Jonathan Yen - San Jose CA, US
Doron Shaked - Haifa, IL
Avi Levy - Tivon, IL
Renato Keshet - Haifa, IL

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

G06K009/48

382199, 382168, 382296, 23546201

Systems and methods for automatically extracting a graphical bar code (i. e. , an image that contains inconspicuous graphical modulations that encode embedded information) are described. In accordance with this automatic extraction scheme, a graphical bar code may be isolated from a composite image in a way that preserves the information-containing graphical modulations encoding the embedded information and avoids corrupting artifacts, such as markings contained in the composite image. The resulting extracted graphical bar code readily may be processed into a format that is tailored to the requirements of a decoding system that may be particularly sensitive to noise, such as extraneous markings and image corruption. In addition, this automatic extraction scheme robustly handles missed and incorrect detections.

6915020, Jul 5, 2005

Dec 19, 2001

10/027523

Niranjan Damera-Venkata - Sunnyvale CA, US
Jonathan Yen - San Jose CA, US

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

G06K009/36

382253, 382100, 358 328

Systems and methods for generating graphical bar codes (i. e. , images that contain inconspicuous graphical modulations that encode embedded information) by halftoning with embedded graphical encoding are described. In one aspect, a graphical bar code is generated by halftoning regions of an original image. The original image regions incorporate errors diffused among regions of the original image and computed based at least in part upon modulations in the graphical bar code corresponding to a graphical encoding of a message. In another aspect, a graphical bar code is decoded by generating a base image having halftone regions representative of an original image. Regions of the base image are compared probabilistically to a set of graphical code words to obtain a sequence of graphical code words corresponding to a graphical encoding of a message. The sequence of graphical code words is decoded to produce a decoded message.