Method of transcoding and transcoding device with embedded filters
US7012960B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2001 |
| Grant date | Mar 14, 2006 |
| Priority date | — |
| Expiry date | Oct 1, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/80
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method of transcoding (200) a primary encoded signal (S1) into a secondary encoded signal (S2). Said transcoding method comprising at least a step of decoding a current picture of the primary encoded signal, said decoding step comprising a dequantizing sub-step (12) for producing a first transformed signal (R1), an encoding step, following the decoding step, for obtaining the secondary encoded signal, said encoding step comprising a quantizing sub-step (13), and a step of predicting a transformed motion-compensated signal (Rmc) from a transformed encoding error (Re) derived from the encoding step, said prediction step being situated between the encoding and decoding steps. Said method of transcoding further comprises a filtering step (21), between the dequantizing sub-step and the quantizing sub-step, for obtaining a better picture quality for low bitrate applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.