Apparatus for detecting sudden changes of a feature in a region of an image that is divided into discrete picture elements
US4747150A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1986 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | May 21, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T7/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention concerns an apparatus for detecting sudden changes of a feature in a region of an image that is divided into discrete picture elements, the feature being represented by complex valued signals, one for each picture element, the signal phase representing the feature class and the signal magnitude representing the certainty in the feature assertion. The apparatus includes a first unit (3) for providing the complex valued signals (10) within the region and at least a second unit for providing at least two collections of complex valued multiplication factor signals (11, 12, 13) that corresponds to the complex valued signals. The apparatus further has a third unit (4) for forming a measurement signal for each collection of multiplication factors, the measurement signal consisting of the sum of the squares of the magnitudes of a first sum signal, which consists of the complex valued products of the complex valued signals (10) and corresponding complex valued multiplication factor signals (11, 12, 13), and a second sum signal, which consists of the complex valued products of the complex valued signals and corresponding conjugate of the complex valued multiplication factor sig…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.