Chai Wah (Chai Wah) Wu  Chai Wah (Chai Wah) Wu photo       

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Research Staff Member
Thomas J. Watson Research Center, Yorktown Heights, NY USA
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2017

Halftone calibration mechanism employing an ink model
Chandu, Kartheek and Ernst, Larry and Vantaram, Sreenath Rao and Stanich, Mikel J and Wu, Chai Wah
US Patent 9,621,762
Abstract

Mechanism for generating a hybrid halftone using a DMSSA screen
Chandu, Kartheek and Stanich, Mikel J and Wu, Chai Wah and Trager, Barry M
US Patent 9,614,998
Abstract


2016

Toner Estimation Mechanism
Wu, Chai Wah and Trager, Barry M and Stanich, Mikel J and Chandu, Kartheek
US Patent 9,229,408
Abstract

Halftone mechanism
Chandu, Kartheek and Stanich, Mikel J and Wu, Chai Wah and Trager, Barry M
US Patent 9,363,414
Abstract

Distributed charging of electrical assets
Soumyadip Ghosh, Dung Phan, Mayank Sharma, Chai Wah Wu, JinJun Xiong
US Patent 9,260,031


2015

Halftone screen generation mechanism
Chandu, Kartheek and Stanich, Mikel and Wu, Chai Wah and Trager, Barry M
US Patent 9,036,212
Abstract


2014

Print head alignment mechanism
Chandu, Kartheek and Stanich, Mikel J and Ernst, Larry M and Vantaram, Sreenath Rao and Wu, Chai Wah
US Patent 8,807,691
Abstract

Method and system for halftoning using energy minimization
Wu, Chai Wah and Trager, Barry M and Stanich, Mikel J and Chandu, Kartheek
US Patent 8,922,802
Abstract

Hybrid halftone generation mechanism using change in pixel error
Chandu, Kartheek and Stanich, Mikel J and Wu, Chai Wah and Trager, Barry M
US Patent 8,922,834
Abstract

Hybrid halftone generation mechanism using change in pixel error
Chandu, Kartheek and Stanich, Mikel J and Wu, Chai Wah and Trager, Barry M
US Patent 8,773,722
Abstract

Hybrid Halftone Generation Mechanism
Chandu, Kartheek and Stanich, Mikel J and Wu, Chai Wah and Trager, Barry M
US Patent App. 14/287,089
Abstract

Mask generation mechanism
Chandu, Kartheek and Stanich, Mikel J and Wu, Chai Wah and Trager, Barry M
US Patent 8,693,054
Abstract

Multibit digital halftoning, indexing 2D and 3D lookup tables
Larry Ernst, Tadanobu Inoue, Mikel Stanich, Chai W Wu
US Patent 8,625,161


2013

System and method of temperature control
Wu, Ann Chen and Wu, Chai Wah
US Patent App. 13/947,799
Abstract

Resource allocation in peer-to-peer streaming
Paolo Dettori, Zhenghua Fu, Julio Nogima, Frank Andre Schaffa, Chai Wah Wu, Peter Hans Westerink, Hao Yang
US Patent 8,494,004


2012


Methods and apparatus for generating dither mask through interpolation between preferred patterns
Mikel John Stanich, Gerhard Robert Thompson, Charles P Tresser, Chai Wah Wu
CA Patent 2,568,500

Semiotic system and method with privacy protection
Andrea Califano, Stephen Carl Kaufman, Marco Martens, William Robert Pulleyblank, Gustavo Alejandro Stolovitzky, Charles Philippe Tresser, Chai Wah Wu, others
US Patent 8,200,982


2010

Data exchange optimization in a peer-to-peer network
Paolo Dettori, Julio Nogima, Frank A Schaffa, Peter Westerink, Chai W Wu
US Patent App. 12/753,954

Generating threshold values in a dither matrix
Mikel John Stanich, Chai Wah Wu, Gerhard Robert Thompson, others
US Patent 7,733,533


2009

MULTIBIT DIGITAL HALFTONING
Larry Ernst, Tadanobu Inoue, Mikel Stanich, Chai W Wu
US Patent App. 12/621,614

CORRECTION OF PRINT ENGINE ARTIFACTS USING AN ITERATIVE HALFTONING SEARCH ALGORITHM
K Chandu, L M Ernst, N Rijavec, M J Stanich, S R Vantaram, C W Wu
US Patent App. 20,100/045,722

System and method for multi-bit halftoning
H. Li, M.J. Stanich, G.R. Thompson, C.W. Wu, others
US Patent 7,616,347

Method and system for designing multilevel halftone screens using spot functions
H. Li, M.J. Stanich, G.R. Thompson, C.W. Wu, others
US Patent 7,599,097

BANDLESS HALFTONE DESIGN FOR MULTIPLE BEAM PRINTERS EMPLOYING NON-ORTHOGONAL HALFTONES
Hong LI, Mikel John Stanich, Gerhard Robert Thompson, Chai Wah WU
EP Patent 2,014,083

Method and apparatus for watermarking data sets
Don Coppersmith, Frederick Cole Mintzer, Charles P Tresser, Chai Wah Wu, Minerva Ming-yee Yeung
EP Patent 0,952,728


2008

Detecting and compensating for color misregistration produced by a color scanner
J S Czyszczewski, H Li, J T Smith, M J Stanich, G R Thompson, C W Wu, others
US Patent 7,400,430



2007

METHOD AND SYSTEM FOR EMBEDDING AN IMAGE INTO TWO OTHER IMAGES
M.J. Stanich, G.R. Thompson, C.W. Wu
US Patent App. 11/751,885

Method and apparatus for producing duplication-and imitation-resistant identifying marks on objects, and duplication-and duplication-and imitation-resistant objects
G. Aggarwal, N.M. Amer, V.R. Austel, P.K. Dubey, A. Kulshreshtha, M. Martens, B.A. Scott, S.W. Smith, C.P. Tresser, R.J. Von Gutfeld, others
US Patent 7,188,258


2006




System for protection of goods against counterfeiting
Don Coppersmith, Claude A Greengard, Charles P Tresser, Chai Wah Wu
US Patent 6,996,543


2005

Method and system for error diffusion with a plurality of error measures
Gerhard Robert Thompson, Steven Lorenz Wright, Chai Wah Wu, others
US Patent 6,870,643

Method and system for scaling with dot gain control
L.M. Ernst, H. Li, Y. Qiao, M.J. Stanich, C.W. Wu
US Patent App. 11/085,161

Method, system, program, and data structures for halftoning with line screens having different lines per inch (LPI)
Danielle Kathyrn Dittrich, Joan LaVerne Mitchell, Fritz H Obermeyer, Gerhard Robert Thompson, Chai Wah Wu
US Patent 6,956,670

Achieving buyer-seller anonymity for unsophisticated users under collusion amongst intermediaries
Alok Aggarwal, Pradeep K Dubey, Charanjit Singh Jutla, Vijay Kumar, Marco Martens, Michael Ira Shub, Charles P Tresser, Chai Wah Wu, others
US Patent 6,873,977




Method and apparatus to correct distortion of document copies
Gordon W Braudaway, Frank P Giordano, Marco Martens, Charles A Micchelli, Charles P Tresser, Chai Wah Wu
US Patent 6,954,290


2004

Method and apparatus for adjusting subpixel intensity values based upon luminance characteristics of the subpixels for improved viewing angle characteristics of liquid crystal displays
Greier, Paul F and Ho, Kenneth C and Kaufman, Richard Ian and Millman, Steven Edward and Thompson, Gerhard R and Wright, Steven L and Wu, Chai Wah
US Patent 6,801,220
Abstract

Method and apparatus for adjusting subpixel intensity values based upon luminance characteristics of the subpixels for improved viewing angle characteristics of liquid crystal displays
Greier, Paul F and Ho, Kenneth C and Kaufman, Richard Ian and Millman, Steven Edward and Thompson, Gerhard R and Wright, Steven L and Wu, Chai Wah
US Patent 6,801,220


Enhanced error diffusion
Gerhard R Thompson, Chai W Wu, Hong Li, Mikel J Stanich
US Patent 20,040,218,220

Method and apparatus for adjusting subpixel intensity values based upon luminance characteristics of the subpixels for improved viewing angle characteristics of liquid crystal displays
Paul F Greier, Kenneth C Ho, Richard Ian Kaufman, Steven Edward Millman, Gerhard R Thompson, Steven L Wright, Chai Wah Wu
US Patent 6,801,220



Method and system for specifying halftone spot shapes
H A Nguyen, M J Stanich, G R Thompson, C W Wu
US Patent App. 20,050/275,898

Method and apparatus for remote commerce with customer anonymity
Michael Shub, Charles Philippe Tresser, Chai Wah Wu
US Patent 6,807,530

Data processing system and method for producing shifted-element halftone screens
D. Dittrich, L. Ernst, G.R. Thompson, C.W. Wu
US Patent 6,687,023


Semi-fragile watermarks
Gaurav Aggarwal, Pradeep K Dubey, Ashutosh Kulshreshtha, Marco Martens, Charles P Tresser, Chai W Wu
US Patent 6,834,344

Dithering method and apparatus for multitone printers
C.H. Morris III, J.L. Mitchell, C.W. Wu, G.R. Thompson, C.P. Tresser, N. Rijavec, others
US Patent 6,714,318

Watermarks for customer identification
Gordon W Braudaway, Marco Martens, Frederick C Mintzer, James B Shearer, Charles P Tresser, Chai W Wu
US Patent 6,807,634


2003

Digital halftoning
M.J. Stanich, G.R. Thompson, C.W. Wu
US Patent App. 10/442,854


Masks with modulated clustering and aperiodicity and rescaling of masks
M J Stanich, G R Thompson, C P Tresser, C W Wu
US Patent 6,597,813

Constrained digital halftoning
R L Adler, M Martens, J L Mitchell, N Rijavec, R H Risch, C P Tresser, C W Wu, others
US Patent 6,603,573

Dither mask generation with calibration-independent number of threshold levels
R Rao, G R Thompson, C P Tresser, C W Wu
US Patent 6,515,770

Method and apparatus for watermarking with no perceptible trace
D.H. Jameson, C.P. Tresser, C.W. Wu, S.R. Abrams, S. Windgrad, others
US Patent 6,564,322

Dither mask generation with calibration-independent number of threshold levels
Ravishankar Rao, Gerhard R Thompson, Charles P Tresser, Chai W Wu
US Patent 6,515,770

Constrained digital halftoning
R.L. Adler, M. Martens, J.L. Mitchell, N. Rijavec, R.H. Risch, C.P. Tresser, C.W. Wu, others
US Patent 6,603,573

Event-recorder for transmitting and storing electronic signature data
Timothy J Chainer, Claude A Greengard, Charles P Tresser, Chai W Wu
US Patent 6,525,672


2002

Method and apparatus for depositing ordinary checks from home or office
Marco Martens, Charles P Tresser, Robert J VON Gutfeld, Chai W Wu
US Patent 6,450,403

Method and system for authenticating objects and object data
T J Chainer, C A Greengard, P A Moskowitz, A G Schrott, C P Tresser, R J Von Gutfeld, C W Wu, others
US Patent 6,397,334

ADJUSTING SUBPIXEL INTENSITY VALUES BASED UPON LUMINANCE CHARACTERISTICS OF THE SUBPIXELS IN LIQUID CRYSTAL DISPLAYS
P GREIER, K HO, R KAUFMAN, S MILLMAN, G THOMPSON, S WRIGHT, C WU
WO Patent WO/2002/059,685

Method and apparatus for securely determining aspects of the history of a good
Timothy J Chainer, Claude A Greengard, William R Pulleyblank, Charles P Tresser, Chai W Wu
US Patent 6,501,390

Method and system for authenticating objects and object data
Timothy Joseph Chainer, Claude A Greengard, Paul Andrew Moskowitz, Alejandro Gabriel Schrott, Charles P Tresser, Robert Jacob Von Gutfeld, Chai Wah Wu
US Patent 6,397,334


2001

Method and apparatus for ordered predicate phi in static single assignment form
C L Thompson, V Santhanam, D Ju, V Bala
US Patent App. 20,040/015,919

Compressed image authentication and verification
R L Adler, B P Kitchens, C P Tresser, C W Wu
US Patent 6,275,599

Method and apparatus for controlling a spot function for digital halftoning
J Q Trelewicz, D K Dittrich, Y Qiao, G R Thompson, C W Wu
US Patent App. 20,030/063,318


Compressed image authentication and verification
Roy L Adler, Bruce P Kitchens, Charles P Tresser, Chai W Wu
US Patent 6,275,599

Printer dependent descreening method
Ravishankar Rao, Gerhard Robert Thompson, Charles Philipe Tresser, Chai Wah Wu
US Patent 6,172,769

Secured signal modification and verification with privacy control
Don Coppersmith, Frederick Cole Mintzer, Charles P Tresser, Chai Wah Wu, Minerva Ming-Yee Yeung
US Patent 6,256,736


2000

Printer independent halftone image rendering
R Rao, G R Thompson, C P Tresser, C W Wu
US Patent 6,055,065

Dithering masks with very large periods
R L Adler, G R Thompson, C P Tresser, C W Wu
US Patent 6,088,123


Multicell clustered mask with blue noise adjustments
G R Thompson, C P Tresser, C W Wu
US Patent 6,025,930


Hand held telephone set with separable keyboard
Arnold Halperin, Joseph D Rutledge, Alejandro Gabriel Schrott, Charles P Tresser, Robert Jacob Von Gutfeld, Chai Wah Wu
US Patent 6,115,616

Printer independent halftone image rendering
R. Rao, G.R. Thompson, C.P. Tresser, C.W. Wu
US Patent 6,055,065

Synchronization-based communication systems
Charles Philippe Tresser, Chai Wah Wu
US Patent 6,064,701

Multicell clustered mask with blue noise adjustments
G.R. Thompson, C.P. Tresser, C.W. Wu
US Patent 6,025,930


Dithering masks with very large periods
R.L. Adler, G.R. Thompson, C.P. Tresser, C.W. Wu
US Patent 6,088,123


1999

Microlocal calibration of digital printers
R Rao, G R Thompson, C P Tresser, C W Wu
US Patent 5,943,477

System and method for accessing the three-dimensional geometry of large objects using X-ray based method subject to limitations on radiation doses
Roy Lee Adler, Nogah Haramati, Alan David Kalvin, Joseph Y Margulies, Charles P Tresser, Chai Wah Wu
US Patent 5,946,370


Microlocal calibration of digital printers
R. Rao, G.R. Thompson, C.P. Tresser, C.W. Wu
US Patent 5,943,477

Target patterns controlled error management
Charles Philippe Tresser, Chai Wah Wu
US Patent 6,006,011

Clustered aperiodic mask
Gerhard Robert Thompson, Charles P Tresser, Chai Wah Wu
US Patent 5,917,951




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