Digital image processing method and computer program product
US6154577A · kind A · utility
11Cited by
10References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1996 |
| Grant date | Nov 28, 2000 |
| Priority date | — |
| Expiry date | Nov 13, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3236
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital image processing method for detecting when and where an image has been altered or modified includes the steps of generating an edge map of an original digital image; convolving the edge map with a carrier signal to generate a dispersed edge map; and combining the dispersed edge map with the original digital image to create a combined image. The combined digital image is checked to determine if it has been modified by correlating the carrier signal with the combined image to produce a recovered edge map; and comparing the recovered edge map with the original image to detect modifications to the combined image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.