Adaptive filter
US6724944B1 · kind B1 · utility
160Cited by
19References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2000 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Jan 18, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/82
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In order to remove blocking artifacts from a frame which has been coded by blocks and then decoded, a certain number of pixels (n) is selected for examination from both sides of the block boundary (30). The number of pixels selected for examination depends on the image content of the frame in the environment of the block boundary, particularly on the difference of the pixel values across the block boundary (30) and the size of the quantization step of the transformation coefficients used in the transformation coding of the blocks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.