Open to closed group of pictures conversion in interframe video compression
US9955183B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2016 |
| Grant date | Apr 24, 2018 |
| Priority date | — |
| Expiry date | Dec 31, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/2343
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods of converting an open group of pictures (GOP) to a Closed GOP are described that remove backward references to the GOP prior to the GOP undergoing conversion in an Open GOP interframe-encoded video stream. Within the GOP undergoing conversion, bipredictive frames with backward references to the prior GOP are replaced with frames referring only to the I frame of the GOP undergoing conversion, which is flagged as an IDR frame. Consolidation and assembly of video clips that are encoded using Open GOP compression schemes generally result in broken interframe references between GOPs. To address this, existing methods involve significant decoding and re-encoding of edited video sequences. The described methods serve to break the backward chain of references in the encoded stream, resulting in reduced re-encoding requirements, with attendant reduced quality degradation of the edited sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.