Target discrimination utilizing median filters
US4603430A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1984 |
| Grant date | Jul 29, 1986 |
| Priority date | — |
| Expiry date | Sep 21, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T7/60
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for processing applied signals indicative of an image scene in order to provide output signals representative of objects in the scene whose sizes are within a predetermined size range. Combinations of median and anti-median filters are employed in serial and parallel configurations to produce the desired size filtering. The basic system comprises first filter means for providing first output signals indicative of objects whose sizes are within a first preselected size range. Second filter means are employed which provide second output signals indicative of objects whose sizes are within a second preselected size range. At least one of the two preselected size ranges contain object sizes within the predetermined size range. Circuit means are provided for coupling the output signals from the two filters in a manner which generates output signals indicative of objects whose sizes are within the predetermined range. A method of processing applied signals to generate output signals containing objects whose sizes are within a predetermined size range is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.