Method and device for scrambling-unscrambling digital image data
US5208857A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1991 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Apr 24, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/044
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and device are disclosed for scrambling-unscrambling digital image data. The data is subjected to processing for extracting the colorimetric components of the pixels forming the image, the components being formed into blocks b(I,J) of N.times.N pixels x(i,j) so as to generate corresponding spatial chopping of the image where I designates a line index and J a column index of arrangement of the blocks in the image, i and j designating a line index and a column index of arrangement of the pixels in each block. The pixels and/or blocks are subjected to an intra-block and/or inter-block mixing procedure. The inter-block mixing consists of an arbitrary re-arrangement of said blocks of pixels and the intra-block mixing mixing consists of an arbitrary re-arrangement of the pixels os each block so as to obtain a scrambled arrangement of blocks and/or pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.