System and method for compressing data using differential coding of coefficient addresses
US5982938A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Mar 31, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In one method of the present invention a plurality of thresholds ranges is selected. A first coefficient of the tree structure is compared against the plurality of threshold ranges during a first single traversal of the tree structure and a second coefficient of the tree structure against the plurality of threshold ranges during the first single traversal of the tree structure. The method of the present invention also determines whether the first or second coefficient satisfies a selected condition with respect to either of the threshold ranges. The difference in addresses between the addresses of the first and second coefficients is determined if the first and second coefficient satisfy the selected condition. The method of the present invention then codes the location of the second coefficient based on the address of the first coefficient using the difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.