Video signal analysis and storage
US7486729B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 25, 2001 |
| Grant date | Feb 3, 2009 |
| Priority date | — |
| Expiry date | Oct 29, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/87
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video recording and logging device includes apparatus to detect scene changes (as distinct from shot cuts or edit points) in audio/video signals. The apparatus includes a filtering arrangement which receives and filters the audio soundtrack accompanying the video signal to periodically determine a background audio signal level. A scene change is indicated when the current background audio level differs from a previous background level by more than a predetermined amount. A short cut or edit point presented near the indicated scene change is identified as the scene change. Preferably changes in background noise distant from shot cuts and edit points are ignored. A table of scene change locations may then be built up and stored with the video and audio data. An editing facility presents scene changes as the first picture in the scene and allows scene change identifications to be added, deleted or labeled by a human editor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.