Apparatus and method for performing sub-pixel vector estimations using quadratic approximations
US7292283B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 2004 |
| Grant date | Nov 6, 2007 |
| Priority date | — |
| Expiry date | Jun 7, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/145
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To achieve the foregoing, and in accordance with the purpose of the present invention, an apparatus and method for generating refined sub-pixel vectors for motion estimation from vector correlation values and converged vector correlation values using quadratic approximations respectively is disclosed. The apparatus and method includes defining a minimum vector position value of a converged vector and then determining a predetermined number of vector correlation samples around the minimum vector position value. The predetermined number of vector correlation samples provide a coarse correlation surface estimation of the minimum vector position value. A correlation surface fitting of the predetermined number of vector correlation samples using a quadratic approximation of the coarse correlation surface estimation of the minimum value is then performed. The correlation surface fitting resulting in a refined sub-pixel minimum vector position with horizontal and vertical components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.