System and method for improved compression of DCT compressed images
US7092965B2 · kind B2 · utility
33Cited by
11References
39Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 9, 2002 |
| Grant date | Aug 15, 2006 |
| Priority date | — |
| Expiry date | Jul 7, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99948
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system providing methods for improved compression of images that have been compressed using Discrete Cosine Transform (DCT) based compression is described. A digital image that has been compressed using DCT based compression, such as an image compressed using the Joint Photographic Experts Group (JPEG) compression scheme, is received and partially decompressed to generate DCT coefficients of the image. The decoded coefficients of the image are then rearranged to aggregate like frequencies together. After rearrangement, the image is recompressed using a wavelet-based compression scheme.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.