Motion estimation within a sequence of data frames using optical flow with adaptive gradients
US6480615B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1999 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Jun 15, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/10016
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The optical flow of an array of pixels in an image field is determined using adaptive spatial and temporal gradients. Artifacts are avoided for image objects which are moving smoothly relative to the image field background. Data from three image frames are used to determine optical flow. A parameter is defined and determined frame by frame which is used to determine whether to consider the data looking forward from frame k to k+1 or the data looking backward from frame k−1 to frame k in initializing spatial and or temporal gradients for frame k. The parameter identifies signifies the areas of occlusion, so that the gradients looking backward from frame k−1 to frame k can be used for the occluded pixel regions. The gradients looking forward are used in the other areas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.