Inventor
WU CHAI W
US19 patents
⚠️ This page may combine multiple inventors who share the name “WU CHAI W”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
IBM
16 patentsUS6450403B1Sep 17, 2002
Method and apparatus for depositing ordinary checks from home or office
IBM199 citations99
US6525672B2Feb 25, 2003
Event-recorder for transmitting and storing electronic signature data
IBM282 citations98
US6275599B1Aug 14, 2001
Compressed image authentication and verification
IBM343 citations98
US6834344B1Dec 21, 2004
Semi-fragile watermarks
IBM85 citations97
US6807634B1Oct 19, 2004
Watermarks for customer identification
IBM78 citations97
US6737954B2May 18, 2004
Event-recorder for transmitting and storing electronic signature data
IBM66 citations96
US6501390B1Dec 31, 2002
Method and apparatus for securely determining aspects of the history of a good
IBM176 citations96
US6515770B1Feb 4, 2003
Dither mask generation with calibration-independent number of threshold levels
IBM20 citations92
US6564322B1May 13, 2003
Method and apparatus for watermarking with no perceptible trace
IBM21 citations89
US10707996B2Jul 7, 2020
Error correcting codes with bayes decoder and optimized codebook
IBM2 citations73
US6982625B2Jan 3, 2006
Event-recorder for transmitting and storing electronic signature data
IBM10 citations73
US6597813B1Jul 22, 2003
Masks with modulated clustering and aperiodicity and rescaling of masks
IBM12 citations73
US6714318B1Mar 30, 2004
Dithering method and apparatus for multitone printers
IBM8 citations72
US6603573B1Aug 5, 2003
Constrained digital halftoning
IBM11 citations71
US6738162B1May 18, 2004
Digital printer for avoiding moire patterns by using a dithering mask and angular rotation between print head and print medium to simulate analog printer halftoning of color images
IBM8 citations70
US12346834B2Jul 1, 2025
Free-form production based on causal predictive models
IBM0 citations52