MPEG block detector
US6611295B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2000 |
| Grant date | Aug 26, 2003 |
| Priority date | — |
| Expiry date | Oct 18, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/86
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of detecting blocking artifacts in digital video pictures, includes a step of filtering (GF) a digital input signal (x) using a gradient filter for providing at least one filtered signal, and a step of calculating (CALC) a block level metric (BM) for processing the filtered signal(s) to identify and count blocking artifacts as a function of their position in a grid. If the block level metric (BM) is lower than a threshold, the picture has either not been encoded using a block-based processing, or has been encoded in a seamless way. In the opposite case, the picture has been encoded using a block-based processing in a non-seamless way and corrective actions, such as a post-processing (PP), can be taken.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.