Data hiding method and data extraction method using statistical examination
US6249870A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1997 |
| Grant date | Jun 19, 2001 |
| Priority date | — |
| Expiry date | Dec 24, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/327
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention makes it possible to properly certify a genuine owner, and to inhibit deterioration of image quality of media information to which an embedding operation is performed by adaptively determining amount of embedding for characteristic values such as pixel values. It includes a data hiding method for embedding message data into media data comprising the steps of obtaining a secondary key by inputting a key having a predetermined value to a specified function; determining hiding positions in which the message data will be embedded according to the obtained secondary key, and selecting one of plural hiding functions according to the secondary key so that the selected hiding function is used for each of the determined hiding positions; and embedding the message data into each of the determined hiding positions according to the selected hiding function corresponding to the hiding position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.