Topographic feature extraction using sensor array system
US4590608A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 1980 |
| Grant date | May 20, 1986 |
| Priority date | — |
| Expiry date | May 30, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/431
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for topographic feature extraction by masking a video signal representation of an optical image using a two-dimension Walsh function is disclosed. The optical energy of an image is converted into a video signal. A Walsh function signal in accordance with a two-dimension Walsh is generated. The video signal is multiplied with the Walsh function signal to produce a Walsh transform coefficients signal indicative of the decomposed spectral components of the image. The method and apparatus can further include providing selected topographical feature signals in accordance with the Walsh transform coefficients of selected topographic features. A selected topographical feature can be detected by comparing the Walsh transform coefficients signal with the selected topographical feature signals. The Walsh transform coefficients signal is unique to the selected topographical feature being detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.