Low-resolution video coding content extraction
US9686565B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 2015 |
| Grant date | Jun 20, 2017 |
| Priority date | — |
| Expiry date | Aug 14, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for extracting low-resolution video from compressed high-resolution video is disclosed. First, a video, comprising high-resolution frames encoded with a predictive coding technique, is input. At least one of the high-resolution frames is a reference frame. The reference frame is down-sampled to produce a first low-resolution frame with a first DC coefficient. Frequency coefficients corresponding to the first low-resolution frame are generated. Then, a second low-resolution frame is generated according to the frequency coefficients and the first low-resolution frame, the second low-resolution frame having a second DC coefficient. A residual error corresponding to the second low-resolution frame is generated. Finally, a third low-resolution frame is generated according to the frequency coefficients, the first low-resolution frame, and the residual error. A third DC coefficient for the third low-resolution frame is determined according to a weighted average of at least the first DC coefficient and the second DC coefficient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.