Image Enhancement Using On-Line Spatial Filtering.
Abstract
The invention provides near-real-time filtering of a video image with spatial frequency bands of the viewer's choosing. The filtering provides an approximation to known filtering processes in the human visual system and permits the results of these filtering processes to be observed in near real time with dynamic imagery. Observation of such filtered images aides in target, shape, object, and feature recognition of objects of different size. When the band pass filtered scene is viewed on the monitor, edges and corners of objects in the scene can be selectively made more or less visible to the observer by adjusting the filter center frequencies with the filter frequency band equal to or not equal to the expected target size. A thresholding operation can be performed on the resultant image leaving only important edges or corners, thereby removing much background clutter unimportant in target detection. In some situations filtering is also beneficial with adjustable high pass or low pass filtering only.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 03, 1979
- Accession Number
- ADD006570
Entities
People
- Henning E. Von Gierke
Organizations
- United States Department of the Air Force