Linear system based, qualitative independent motion detection from compressed mpeg surveillance video
US8164629B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 2009 |
| Grant date | Apr 24, 2012 |
| Priority date | — |
| Expiry date | Dec 18, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30232
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention features a qualitative method to detect independent motion revealed in successive frames of a compressed surveillance MPEG video stream using linear system consistency analysis without decompression of the stream, identifying the segments containing independent motion in a real-time or faster manner, for the retrieval of these segments. The linear system is constructed using the macroblocks of MPEG compressed video frames. The normal flow value of the macroblock is obtained by taking the dot product between the macroblock gradient vector, computed by averaging the four block gradient vectors, and the motion vector of this macroblock. The normal flow value is filtered for inclusion in the linear system, and the statistic of the matrices of the resulting linear system is determined, filtered to screen out false negatives and outliers, and used to determine the presence or absence of independent motion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.