Adaptive video processor

Details Adaptive video processor Adaptive video processor

1980-03-21

1981-11-10

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, 358284, 3401463AG, H04N 514, H04N 140, G06K 912

Patent

active

043001645

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.

REFERENCES:
Calfee, "Adaptive FSK Data Demodulator", IBM Technical Disclosure Bulletin, vol. 5, No. 11, Apr. 1963, p. 76.

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