Methods and apparatus to extend a timestamp range supported by a watermark
US10448122B1 · 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. Disclosed example watermark encoding apparatus also include a symbol swapper to swap at least two symbols of the watermark when the timestamp is to represent a second one of the timestamp cycles but not to swap the at least two symbols of the watermark when the timestamp is to represent a first one of the timestamp cycles. 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.