Automatic facusing using slope and peak detection
US4544953A · kind A · utility
10Cited by
6References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 28, 1983 |
| Grant date | Oct 1, 1985 |
| Priority date | — |
| Expiry date | Mar 28, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed a VIDEO AUTOMATIC FOCUSSING SYSTEM in which a video signal from the television camera is directed to a band pass filter and then detected to produce a DC signal indicative of the video signal as band limited. The detected signal is directed to the inputs of a negative slope detector and peak detector. The detectors monitor the slope of the video signal to form the basis for controlling the motor to achieve automatic focussing on command.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.