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 Adaptive video processor

Details
Inventors: Sacks, Jack;
Assignee: View Engineering, Inc. (Chatsworth, CA)
Primary Examiner: Martin; John C.
Assistant Examiner:
Attorney, Agent or Firm: Singer and Singer

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.

DETAILED DESCRIPTION I claim: 1.
An adaptive video processor for use with a pattern recognition system comprising: video camera means for generating a video signal representative of an area being scanned, circuit means connected to the output of said video camera for generating a substantially constant amplitude output signal, comparing means for generating an output signal whenever said video signal changes positively or negatively with respect to ground, capacitor means interconnecting said circuit means with said comparing means, and capacitor charging and discharging means selectively controlled by the output of said comparing means for controlling the charging and discharging of said capacitor means to ground as a function of the output signals received from said comparing means.
2.
An adaptive video processor for use with a pattern recognition system according to claim 1 in which said video camera means incorporates a horizontal scan frequency of 15.
75 kilohertz and a vertical scan frequency of 60 hertz.
3.
An adaptive video processor for use with a pattern recognition system according to claim 2 in which the output of said camera means at the substantially low horizontal and vertical scan frequencies generates a spurious output signal that varies in amplitude with frequency.
4.
An adaptive video processor for use with a pattern recognition system according to claim 1 in which said circuit means includes a high pass filter for differentiating the video signal to provide a boost to the high frequency components of the video signal that compensates the video signal for loss of resolution in the camera at the higher frequencies.
5.
An adaptive video processor for use with a pattern recognition system according to claim 4 which includes means for combining a portion of the input video signal with the differentiated video signal for adding a portion of the low frequency component of the video signal to the differentiated video signal for preventing false crossings.
6.
An adaptive video processor for use with a pattern recognition system according to claim 1 which includes an isolation amplifier of high impedance between the circuit means and the capacitor means to prevent the charging and discharging of said capacitor means from loading down the output of said circuit means


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