Method and apparatus for blocking effect reduction
US6898321B1 · kind B1 · utility
168Cited by
34References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1999 |
| Grant date | May 24, 2005 |
| Priority date | — |
| Expiry date | Oct 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/86
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
By utilizing parameters derivable from a compressed bit-stream, measures are obtained of the subjective quality of a decoded picture, without the necessity for reference to source material. A blockiness measure is derived both locally and globally and used to control a de-blocking filter. An estimate of signal-to-noise ratio is derived from quantization values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.