Inventor · disambiguated record
Chai Wah Wu
Also filed as: WU CHAI W · WU CHAI WAH
80 granted patents·14 pending applications·3,037 citations·filing 1997–2024
99Inventor score
Top patents by PatentIndex Score
94 records- 0197US6450403B1Method and apparatus for depositing ordinary checks from home or officeIBM·Filed 2001·Granted Sep 17, 2002·199 cites·20 claims
- 0297US6275599B1Compressed image authentication and verificationIBM·Filed 1998·Granted Aug 14, 2001·343 cites·13 claims
- 0396US6069955ASystem for protection of goods against counterfeitingIBM·Filed 1998·Granted May 30, 2000·234 cites·17 claims
- 0495US6954290B1Method and apparatus to correct distortion of document copiesIBM·Filed 2000·Granted Oct 11, 2005·106 cites·9 claims
- 0595US6801220B2Method and apparatus for adjusting subpixel intensity values based upon luminance characteristics of the subpixels for improved viewing angle characteristics of liquid crystal displaysIBM·Filed 2001·Granted Oct 5, 2004·128 cites·28 claims
- 0694US9621762B2Halftone calibration mechanism employing an ink modelCHANDU KARTHEEK·Filed 2012·Granted Apr 11, 2017·23 cites·18 claims
- 0794US6397334B1Method and system for authenticating objects and object dataIBM·Filed 1998·Granted May 28, 2002·199 cites·59 claims
- 0891US6525672B2Event-recorder for transmitting and storing electronic signature dataIBM·Filed 1999·Granted Feb 25, 2003·282 cites·11 claims
- 0988US7215445B2Method and apparatus to correct distortion of document copiesIBM·Filed 2005·Granted May 8, 2007·11 cites·8 claims
- 1086US6907527B1Cryptography-based low distortion robust data authentication system and method thereforIBM·Filed 2000·Granted Jun 14, 2005·45 cites·32 claims
- 1186US6737954B2Event-recorder for transmitting and storing electronic signature dataIBM·Filed 2001·Granted May 18, 2004·66 cites·14 claims
- 1285US6834344B1Semi-fragile watermarksIBM·Filed 1999·Granted Dec 21, 2004·85 cites·28 claims
- 1385US6115616AHand held telephone set with separable keyboardIBM·Filed 1998·Granted Sep 5, 2000·115 cites·11 claims
- 1484US10586131B2Multimedia conferencing system for determining participant engagementIBM·Filed 2017·Granted Mar 10, 2020·4 cites·18 claims
- 1584US8282182B2Correction of print engine artifacts using an iterative halftoning search algorithmCHANDU KARTHEEK·Filed 2009·Granted Oct 9, 2012·8 cites·20 claims
- 1683US9260031B2Distributed charging of electrical assetsIBM·Filed 2013·Granted Feb 16, 2016·9 cites·26 claims
- 1783US7100050B1Secured signal modification and verification with privacy controlIBM·Filed 2000·Granted Aug 29, 2006·22 cites·4 claims
- 1883US6807634B1Watermarks for customer identificationIBM·Filed 1999·Granted Oct 19, 2004·78 cites·20 claims
- 1980US11544061B2Analog hardware matrix computationIBM·Filed 2020·Granted Jan 3, 2023·1 cites·18 claims
- 2080US6023495ASystem and method for acquiring three-dimensional data subject to practical constraints by integrating CT slice data and CT scout imagesIBM·Filed 1998·Granted Feb 8, 2000·62 cites·5 claims
- 2179US6256736B1Secured signal modification and verification with privacy controlIBM·Filed 1998·Granted Jul 3, 2001·53 cites·12 claims
- 2278US11366876B2Eigenvalue decomposition with stochastic optimizationIBM·Filed 2020·Granted Jun 21, 2022·1 cites·25 claims
- 2378US6501390B1Method and apparatus for securely determining aspects of the history of a goodIBM·Filed 1999·Granted Dec 31, 2002·176 cites·23 claims
- 2477US8807691B2Print head alignment mechanismCHANDU KARTHEEK·Filed 2012·Granted Aug 19, 2014·2 cites·16 claims
- 2576US6956670B1Method, system, program, and data structures for halftoning with line screens having different lines per inch (LPI)IBM·Filed 2000·Granted Oct 18, 2005·15 cites·50 claims
- 2675US10707996B2Error correcting codes with bayes decoder and optimized codebookIBM·Filed 2018·Granted Jul 7, 2020·2 cites·20 claims
- 2775US8773722B2Hybrid halftone generation mechanism using change in pixel errorCHANDU KARTHEEK·Filed 2012·Granted Jul 8, 2014·2 cites·18 claims
- 2875US6873977B1Achieving buyer-seller anonymity for unsophisticated users under collusion amongst intermediariesIBM·Filed 2000·Granted Mar 29, 2005·10 cites·11 claims
- 2973US7733533B2Generating threshold values in a dither matrixINFOPRINT SOLUTIONS CO LLC·Filed 2006·Granted Jun 8, 2010·3 cites·20 claims
- 3073US7599097B2Method and system for designing multilevel halftone screens using spot functionsINFOPRINT SOLUTIONS CO LLC·Filed 2005·Granted Oct 6, 2009·3 cites·20 claims
- 3173US5917951AClustered aperiodic maskIBM·Filed 1997·Granted Jun 29, 1999·43 cites·9 claims
- 3271US8494004B2Resource allocation in peer-to-peer streamingDETTORI PAOLO·Filed 2010·Granted Jul 23, 2013·3 cites·7 claims
- 3370US7400430B2Detecting and compensating for color misregistration produced by a color scannerINFOPRINT SOLUTIONS CO LLC·Filed 2003·Granted Jul 15, 2008·9 cites·16 claims
- 3470US6996543B1System for protection of goods against counterfeitingIBM·Filed 1998·Granted Feb 7, 2006·150 cites·16 claims
- 3569US7545537B2Bandless halftone design for multiple beam printers employing non-orthogonal halftonesINFOPRINT SOLUTIONS CO LLC·Filed 2005·Granted Jun 9, 2009·2 cites·20 claims
- 3669US6870643B2Method and system for error diffusion with a plurality of error measuresIBM·Filed 2001·Granted Mar 22, 2005·12 cites·44 claims
- 3767US8520253B2Method and system for scaling with dot gain controlERNST LARRY M·Filed 2005·Granted Aug 27, 2013·3 cites·19 claims
- 3867US7188258B1Method and apparatus for producing duplication- and imitation-resistant identifying marks on objects, and duplication- and duplication- and imitation-resistant objectsIBM·Filed 1999·Granted Mar 6, 2007·62 cites·34 claims
- 3967US6564322B1Method and apparatus for watermarking with no perceptible traceIBM·Filed 1999·Granted May 13, 2003·21 cites·22 claims
- 4066US8922834B2Hybrid halftone generation mechanism using change in pixel errorCHANDU KARTHEEK·Filed 2012·Granted Dec 30, 2014·1 cites·23 claims
- 4166US6982625B2Event-recorder for transmitting and storing electronic signature dataIBM·Filed 2003·Granted Jan 3, 2006·10 cites·13 claims
- 4263US7446904B2Methods and apparatus for generating dither mask through interpolation between preferred patternsINFOPRINT SOLUTIONS CO LLC·Filed 2004·Granted Nov 4, 2008·5 cites·30 claims
- 4363US7433856B2Optimization with unknown objective functionIBM·Filed 2003·Granted Oct 7, 2008·7 cites·21 claims
- 4462US2005125279A1Method and structure for privacy preserving data miningIBM·Filed 2003·Application pending·0 cites
- 4560US12306902B2Hardware acceleration for computing eigenpairs of a matrixIBM·Filed 2021·Granted May 20, 2025·0 cites·20 claims
- 4660US9614998B2Mechanism for generating a hybrid halftone using a DMSSA screenCHANDU KARTHEEK·Filed 2014·Granted Apr 4, 2017·0 cites·16 claims
- 4760US8200982B2Semiotic system and method with privacy protectionCALIFANO ANDREA·Filed 2010·Granted Jun 12, 2012·1 cites·17 claims
- 4860US8108537B2Method and system for improving content diversification in data driven P2P streaming using source pushFU ZHENGHUA·Filed 2008·Granted Jan 31, 2012·2 cites·25 claims
- 4960US7310168B2Method and apparatus for controlling a spot function for digital halftoningINFOPRINT SOLUTIONS CO LLC·Filed 2001·Granted Dec 18, 2007·8 cites·12 claims
- 5059US8625161B2Multibit digital halftoning, indexing 2D and 3D lookup tablesERNST LARRY·Filed 2009·Granted Jan 7, 2014·1 cites·18 claims
Showing the top 50 of 94 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →