Method for constructing a composite image incorporating a hidden authentication image
US9275303B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2014 |
| Grant date | Mar 1, 2016 |
| Priority date | — |
| Expiry date | Feb 12, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09C5/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method is provided for constructing a composite image having an authentication image formed therein. The authentication image is viewable using a decoder lens having one or more decoder lens frequencies. The method includes generating two gray-scale component images having tonal areas that are tonally balanced around at least one tonal value. At least one of the two gray-scale component images includes a representation of the authentication image. The method further includes determining a first pattern of the component image elements for the two gray-scale component images, the first pattern including a first element configuration and at least one element frequency that is equal to or a multiple of one of the decoder lens frequencies. The method includes extracting at least a portion of the content from the component image elements of the two gray-scale component images and constructing a composite image having a second pattern of composite image elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.