Video signal processing apparatus
First Claim
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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Abstract
A video signal processing device comprises a synthesizing circuit for synthesizing three signals delayed a unitary time with respect to each other, a detecting circuit for detecting correlations of these three signals, and an output circuit for selecting and outputting, on the basis of a result of detection of the correlations, two signals each indicative of an average value of the signals neighboring in terms of time and a signal which may exist intermediate the length of time. The correlation detecting circuit is operable to detect two of the three signals delayed a predetermined time T from each other, which have a closer correlation with each other. The output signal selecting circuit is operable in response to the result of detection performed by the correlation detecting circuit to output the signal indicative of the average value of these two signals having the closer correlation with each other, or the signal existing at the center of the length of time between these two signals.
22 Citations
6 Claims
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1. A video signal processing device which comprises:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification