Apparatus and method for improving the compressibility of an enhanced image through use of a momentarily varying threshold level
US4868670A · kind A · utility
12Cited by
28References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1987 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Jul 24, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/10008
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus and an accompanying method are disclosed herein for improving the compressibility of an enhanced digital video signal, illustratively comprised of a serial bit stream, such as that generated by scanning a video image produced, for example, by a microfilm scanner. Specifically, whenever a video transition occurs in the a stream of incoming pixels, this apparatus momentarily varies a threshold level, in an appropriate direction, during the transition in order to reduce the noise content in threshold pixel values and thereby enhance the compressibility of these pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.