Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8170274 | Method and apparatus for hiding data for halftone images | Oscar Chi-Lim Au | 2012-05-01 |
| 7804977 | Methods and apparatus for hiding data in halftone images | Oscar Chi-Lim Au | 2010-09-28 |
| 7697715 | Methods and apparatus for hiding data in halftone images | Oscar Chi-Lim Au | 2010-04-13 |
| 7495805 | Enhancing an image, such as an image having bi-valued pixel values | Oscar Chi-Lim Au | 2009-02-24 |
| 7058199 | Methods and apparatus for hiding data in halftone images | Oscar Chi-Lim Au | 2006-06-06 |
| 6690811 | Methods and apparatus for hiding data in halftone images | Oscar Chi-Lim Au | 2004-02-10 |