Authentication algorithms for video images
US6418223B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1999 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Feb 4, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3278
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of authenticating a video image created by a camera (V) or similar video device. The image is formed into a first 2-dimensional pixel array (A1) with each pixel (pm,n) represented by a data word of a predetermined length. Additional data words including event information are added to this 2-dimensional array (A1). The formatted array is converted into a second 2-dimensional array (A2) which may be made smaller than the first array by eliminating rows and columns from the formatted array. A first linear vector (A3) is created using the data words in the second array, and a second linear vector (A4) is created by repositioning the data words from the first linear vector in a random pattern. A checksum is created by summing the contents of all of the data words in the second linear vector beginning at a location established by a pre-established formula. A header (H) is formed using the resulting checksum, information identifying the device used to create the image, and the time the image is formed. A cyclical redundancy check (CRC) is performed using all the data words in the formatted array (A1). Results of this operation are also included in the header. The header is attach…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.