Data processing apparatus and method
US7609850B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 7, 2005 |
| Grant date | Oct 27, 2009 |
| Priority date | — |
| Expiry date | Aug 31, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/327
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data processing apparatus includes a registration processor that divides a frame of a water marked image into a plurality of image blocks. For each of the image blocks, an observed probability of possible distortion vectors representing shifts of the image block with respect to positions of the block in the original version of the image is estimated. For each of the image blocks, forward and backward probability distribution estimates of possible distortion vectors within the image block are generated recursively from the respective observed probability of distortion vectors for the image block and forward and backward probability distribution estimates determined respectively from previous and subsequent image blocks for a predetermined path through the blocks. For each image block, the forward and backward probability distribution estimates and the observed probability of distortion vector are combined to form a most likely distortion vector estimate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.