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Video signal processing apparatus

  • US 5,051,818 A
  • Filed: 11/02/1989
  • Issued: 09/24/1991
  • Est. Priority Date: 11/04/1988
  • Status: Expired due to Term
First Claim
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1. A video signal processing device which comprises:

  • a filtering means for removing a low frequency component of an input video signal;

    a delay signal synthesizing means for formulating three signals S(i-T), S(i) and S(i+T) (wherein i represents a current timing) by delaying the signal, whose low frequency component has been removed, at intervals of a unitary time T set in a predetermined period within one horizontal scanning period, n horizontal scanning period (n-representing an integer greater than

         1), n-field period or n-frame period;

    a difference signal synthesizing means for formulating signals {S(i)-S(i-T)}/2 and {S(i)-S(i+T)}/2;

    an absolute value calculating means for calculating respective absolute values of {S(i)+S(i-T)} and {S(i+T)+S(i)};

    a sign discriminating means for determining respective signs SGN of {S(i)+S(i-T)} and {S(i+T)+S(i)};

    a correlation detecting means for determining conditions of the following equations descriptive of output characteristics;

    ##STR1## wherein;

    S(i);

    Signal appearing at the timing i and from which the low frequency component has been removed;

    SGN;

    Function of outputting the positive and negative signs;

    ABS;

    Function of outputting the absolute value;

    R(i) Output signal appearing at the timing i; and

    ,a selecting means for selecting and outputting an output signal R(i) according to the equations descriptive of the output characteristics and o the basis of a result of detection performed by the correlation detecting means.

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