Method for rotating image records with non-isotropic topical resolution
US6640018B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 2000 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Jan 22, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T3/60
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for rotating at least two-dimensional image records with non-isotropic topical resolution, in which a rotation of an image record is described using a rotation matrix; the rotation matrix is represented as a product of at least two shear matrices, each having exactly one element that is dependent on the angle of rotation, while their remaining elements are exclusively ones and zeroes; the matrix element, which is dependent on the angle of rotation, of at least one shear matrix is multiplied by a factor; and the rotation of the image record is carried out in Fourier space without interpolations and without forming an isotropic auxiliary record, by exploiting the displacement set of the Fourier transformation by implementing the shear matrices as displacements of line elements of the image record.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.