Methods and apparatus to extend a timestamp range supported by a watermark
US10448123B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 2018 |
| Grant date | Oct 15, 2019 |
| Priority date | — |
| Expiry date | Jul 2, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/8547
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods, apparatus, systems and articles of manufacture (e.g., physical storage media) to extend a time range supported by a watermark are disclosed. Example watermark encoding apparatus disclosed herein include a timestamp cycle evaluator to determine which one of a plurality of timestamp cycles is to be represented by a timestamp of a watermark, the timestamp including a set of timestamp symbols. Disclosed example watermark encoding apparatus also include a symbol modifier to modify a subset of data symbols of the watermark based on a further timestamp symbol not included in the set of timestamp symbols of the timestamp, the further timestamp symbol identifying the one of the timestamp cycles to be represented by the timestamp of the watermark. Disclosed example watermark encoding apparatus further include a watermark embedder to embed the watermark in a first piece of media.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.