Adaptive video processor
US4300164A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1980 |
| Grant date | Nov 10, 1981 |
| Priority date | — |
| Expiry date | Mar 21, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a pattern recognition system the video output signal is a signal representative of either black or white. The shading effect of the video camera is minimized by using a high pass filter to accentuate the high frequency components of the signal by partially differentiating the substantially square wave input video signal and feeding forward a sample of the undifferentiated signal thereby retaining some low frequency components of the video signal and thereby minimizing the shading effect of the video camera without increasing detected noise components. Positive and negative-going zero crossings with respect to ground are detected through a capacitive coupled comparator circuit. In the absence of zero crossings the discharge circuit and charge circuit of the capacitor is interrupted thereby maintaining the value of the voltage on the capacitor with respect to ground. Changing the charge and discharge rate of the capacitor reduces the probability that noise on the signal will cause a false zero crossing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.