JADE-JPEG based adaptive document compression engine
US6701020B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2001 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | May 2, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/176
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method, system and program product for compressing a compound image, comprising forming compound image data into a plurality of blocks; obtaining classifying data that designate one from a plurality of classes for each of a plurality of said blocks, based on predominate compression properties of the block; for each of a plurality of said blocks, obtaining transformed data therefor from either a lossy or a lossless transform selected based on the classifying data for the block; and forwarding that transformed data to one entropy encoder. In one embodiment, obtaining transformed data comprises obtaining transformed data from at least one of a lossy transform, a first lossless transform, or a second lossless transform, based on the classifying data for the transform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.