Hybrid wavelet and JPEG system and method for compression of color images
US6389160B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1999 |
| Grant date | May 14, 2002 |
| Priority date | — |
| Expiry date | Apr 9, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T9/007
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data encoder and method encodes color image data. The image data include Y, U and V data. A data image quality level is selected, which corresponds to a compression ratio. The Y data is encoded using a wavelet or wavelet-like compression method in accordance with the selected data image quality level. When the compression ratio is less than a threshold value, indicating a low compression ratio, the U and V data are compressed using a JPEG compression method. Otherwise the U and V data are compressed using the wavelet or wavelet-like compression method. The encoded image data includes an indication of which compression method was used to encode the U and V data. When encoded image data is decoded by a data decoder, the decoder determines which compression method was used to encode the U and V data, and then decodes the encoded image data accordingly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.