Scrambling of image portions via color component interchange
US7583848B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 2004 |
| Grant date | Sep 1, 2009 |
| Priority date | — |
| Expiry date | Jun 24, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/88
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus that is capable of presenting a general overview of the contents of an original image from its corresponding scrambled image is disclosed. The image processing apparatus applies a discrete wavelet transform to a pixel value of each of at least one rectangular region into which image data are divided and hierarchically compresses the image data into a compressed code stream. Then the image processing apparatus performs a scrambling process on compressed code within the compressed code stream that is of a level corresponding to a high resolution image component and refrains from performing the scrambling process on compressed code other than that of the level corresponding to the high resolution image component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.