Non-copy correlation mark
US11006021B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2019 |
| Grant date | May 11, 2021 |
| Priority date | — |
| Expiry date | Dec 31, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/327
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for rendering a correlation mark on a recording medium can involve encoding a pattern based on a correlation effect color based on a color recipe that includes a high density of one primary color and a mid-to-low density of at least one other primary color, and adjusting the pattern to ensure that the encoding is lost in a resulting rendering of a correlation mark embedded with the pattern. The pattern imposed on the correlation mark is not readily visible in an original without a decoding key. The correlation mark can include a frequency that is sufficiently high so that a copy of the correlation mark may not reproduce with the pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.