The Use of an Iterative Algorithm for the Improvement of the Signal-to-Noise Ratio of TV Signals,
Abstract
A well known method of improving the signal-to-noise ratio of TV pictures is the use of long persistence (integrating) phosphors. This works well in some circumstances but suffers from a number of disadvantages. Another technique, which does not suffer from the disadvantage of permanence, is storage (integration) on the camera photo-surface achieved by a reduction in the field scanning rate. The usefulness of this technique is limited by loss of resolution due to sideways diffusion of the stored charge pattern, and also the fact that the reduced read-out rate either creates problems of flicker, or introduces the complication of display refreshment. A much more flexible method, largely overcoming the disadvantages noted above, could be provided by averaging the video signal in real time, a concept which involves video information storage. This paper constitutes a preliminary study of real time video signal averaging, covering both the theory and the problems of practical implementation. This is done by starting from a well known method of improving signal-to-noise ratio and using this to exemplify some problems of a practical system. From this a better algorithmic method is developed which appears to be susceptible of practical realisation.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1976
- Accession Number
- ADA030631
Entities
People
- D. E. Vaughan
- J. M. Williams
Organizations
- Royal Signals and Radar Establishment