Signal processors and methods for estimating geometric transformations of images for digital data extraction
US9959587B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 2016 |
| Grant date | May 1, 2018 |
| Priority date | — |
| Expiry date | Oct 13, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0081
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Signal processing devices and methods estimate a geometric transform of an image signal. From a seed set of transform candidates, a method applies a seed transform candidate to a reference signal. For each candidate, update coordinates of reference signal features are identified in the image signal and provided as input to a least squares method to compute an update to the transform candidate. At the end of the process, the method identifies a geometric transform or set of top transforms based on a further analysis of correlation, as well as other results. Phase characteristics are exploited in the process of updating coordinates. The geometric transform is used to facilitate extracting embedded digital messages from the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.