Method and apparatus for transcoding coded video image data
US6912253B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 2000 |
| Grant date | Jun 28, 2005 |
| Priority date | — |
| Expiry date | Sep 22, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/587
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A transcoding apparatus converts first coded data obtained from a plurality of frames forming a video image by means of a coding algorithms including an interframe prediction coding algorithm with motion compensation into second coded data having a different structure. More specifically, the transcoding apparatus takes a portion of frames which have had the interframe prediction coding and are included in the plurality of frames forming the video image as processing object frames, and from at least the first coded data corresponding to the processing object frames, generates the second coded data corresponding to coded data which are to be obtained when performing the interframe prediction coding on the processing object frames with reference to second reference frames which are different from first reference frames referenced in the interframe prediction coding of the processing object frames. In order to the second coded data, the transcoding apparatus has a motion information calculating portion for calculating motion information to be included in the second coded data using at least motion information contained in said processing object data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.