Correspondence-between-images detection method and system
US6546120B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1999 |
| Grant date | Apr 8, 2003 |
| Priority date | — |
| Expiry date | Aug 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/51
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A correspondence-between-images detection method includes the following three basic steps: (1) Error operation step based on block matching: Block matching is executed by making a search for displacement with the difference absolute sum of intensity errors reaching the minimum from within a comparison image with respect to a block of 16×16 pixels in a reference image. (2) Quadratic error function approximation step with differential operator: Assuming that the block matching result forms a curved surface is parabolic, quadratic error function approximation is executed. (3) Nonlinear iteractive minimization step with respect to planar perspective mapping parameter: The quadratic error function sum on the whole screen is found by executing a sequential recursive step of a Newton's method improved for planar perspective mapping parameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.