Method and apparatus for detecting data
US6954857B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 2002 |
| Grant date | Oct 11, 2005 |
| Priority date | — |
| Expiry date | Apr 28, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0065
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for facilitating copyright protection of material includes an apparatus for detecting the presence or absence of a block of data, which may have been embedded repeatedly a predetermined number of times in the material. The presence or absence of the data block is detected from data representative of versions of the data block recovered from the material. The apparatus comprises an accumulator operable to combine the value of the bit at each corresponding position within each recovered version of the data block to generate for each bit an accumulated score. A detection processor is operable to compare the value of the accumulated scores for the bits of the block with at least one threshold, and from the comparison determine a total number of detected bits of the data block. The detection processor declares the data block as being present or absent in dependence upon the total number of detected bits. For example, the detection processor may compare the determined total number of detected bits with a threshold determined with respect to the total number of bits in the data block. If the determined number of detected bits is greater than the threshold, the detection processor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.