Image processing with anti-forgery provision
US5418602A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 24, 1993 |
| Grant date | May 23, 1995 |
| Priority date | — |
| Expiry date | Feb 24, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S283/902
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A discriminating circuit discriminates the degree of similarity between an image represented by an input image signal and a predetermined specific image. A CPU outputs a pattern-level selecting signal based upon the results of discrimination performed by the discriminating circuit. A pattern adding circuit modulates an internally stored specific pattern in accordance with an added-color designating signal and pattern-level selecting signal produced by the CPU, and adds the modulated specific pattern to the image signal. As a result, a pattern specific to the apparatus is added in a reliably identifiable manner to an image output having a high probability of containing the specific original. In the case of an image output having a low probability of containing the specific original, the specific pattern is added to this image output in such a manner that the picture quality thereof is not diminished by the added pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.