Image marking with error correction
US6317505A · kind A · utility
24Cited by
78References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1999 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Nov 3, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/327
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of marking a work of authorship without apparent evidence of data alteration. The work (e.g., an image) is represented by a set of data elements (e.g., pixels). The marking includes providing first plural-bit data, and computing therefrom additional, error correcting data. This composite set of data is used in image marking, permitting at least certain errors to be discerned and corrected when the marking is later discerned from the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.