Patent · US Active

Optical flow estimation method

US7822231B2 · kind B2 · utility

9Cited by

4References

23Claims

0Family size

Assignee

Queen Mary & Westfield College, University of London · GB

Inventors

Miguel Coimbra · Vila Nova de Gaia, PT
Michael Davies · Stoney Creek, CA

Key dates

Filing date	Jul 1, 2004
Grant date	Oct 26, 2010
Priority date	—
Expiry date	Jan 16, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH04N19/513
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The optical flow in an image is estimated using only parameters extracted directly from a compressed video data stream, substantially eliminating the need to decode the video data stream for this purpose. Coefficients extracted from the compressed video data stream are used to establish a confidence map indicative of the edge strength within the image data and hence the accuracy of the associated motion field. A smooth motion field is generated from the motion vectors inherent in the compressed video data stream. The motion field is then used to update the confidence map between frames, providing an estimate of the optical flow.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.