Post-filtering for decoded video signals
US5590064A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1994 |
| Grant date | Dec 31, 1996 |
| Priority date | — |
| Expiry date | Oct 26, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/044
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Encoded video signals comprise sets of transform coefficients (e.g., DCT coefficients) corresponding to different regions of a video frame. An inverse transform is applied to sets of transform coefficients to generate decoded regions of a decoded video frame. The discontinuities for boundaries between adjacent regions are used to adjust one or more of the transform coefficients. The adjusted sets of transform coefficients are then used to generate filtered regions of a filtered video frame corresponding to the decoded video frame. In a preferred embodiment, the transform coefficients are DCT coefficients and the DC and first two AC DCT coefficients are sequentially adjusted to correct for quantization errors in the encoding process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.