Method and apparatus for video image data recording and playback
US8374480B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 2009 |
| Grant date | Feb 12, 2013 |
| Priority date | — |
| Expiry date | May 31, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/765
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video data recoding method suitable for recording computer sessions. Each video image frame is divided into multiple blocks. A server processes the video frames and transmits only changed blocks for each frame to a video log server. The video log server stores the changed blocks with block indices in a data file. The video log server also maintains a virtual frame table which stores, for each block of the frame, the data location within the data file where the most recent occurrence of that block is stored. The virtual frame table is continuously updated as changed blocks are stored in the data file. The video log server further stores a snapshot file containing snapshots of the virtual frame table at predetermined time points, along with time stamps and a next changed frame location. The data file and the snapshot file are used to reproduce the video images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.