Video object tracking using a hierarchy of deformable templates
US6574353B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 8, 2000 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Feb 8, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/62
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A hierarchy of deformation operations is implemented to deform a template and match the deformed template to an object in a video frame. At each level, the constraints on the template deformations are relaxed, while the spatial range of the object boundary search is narrowed. At a highest level, an initial template is translated, rotated and scaled to coarsely locate the object within a given image frame. At a middle level, an affine transformation is implemented, globally or locally, to deform the template. For a local affine transformation process, a sup-portion, such as an articulation or appendage portion of the template is deformed. The middle level refines the template to get the template boundary close to the actual object boundary within a given frame. At the lowest level, a local segmentation algorithm is applied to deform the now close boundary to finely match the object boundary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.