Video signal motion detecting apparatus
First Claim
1. A detector for detecting interimage motion in images represented by composite video signal comprising:
- an input terminal for applying composite video signal;
delay means, coupled to said input terminal, for providing replicas of said composite video signal delayed by an integral number, including one, of image periods;
means coupled to said input terminal and said delay means for providing differences of said composite video signal and said delayed composite video signal;
means, including means coupled to said means for providing differences, for passing to a first output terminal, differences having frequency components normally occupied by chrominance components of said composite video signal to the relative exclusion of other frequency components of said composite video signal;
first combining means coupled to said first output terminal for combining a plurality of differences, including a difference corresponding to an image point (pixel) under examination for motion, said plurality of differences corresponding to image points occurring in a horizontal image line containing said image point under examination and a horizontal image line preceding said horizontal image line containing said image point under examination;
a first threshold detector, coupled to said first combining means, for producing a motion indicating signal when combined differences applied thereto exceed a predetermined magnitude;
a second combining means, coupled to said first output terminal, for combining a plurality of differences including a difference corresponding to said image point under examination, said plurality of differences corresponding to image points occurring in a horizontal image line containing said image point under examination and a horizontal image line following said horizontal image line containing said image point under examination;
a second threshold detector, coupled to said second combining means, for producing a motion indicating signal when combined differences applied thereto exceed a predetermined magnitude;
means, coupled to said first and second threshold detectors, for providing at a second output terminal, a motion indicating signal whenever the first and second threshold detectors concurrently produce motion indicating signals.
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Accused Products
Abstract
A motion detector for detecting interimage motion represented by composite video signals analyzes both the chrominance and luminance components for image motion. Interimage motion represented by the luminance component is determined from interimage signal differences. The interimage signal differences are separated into high and low frequency spectra corresponding to fine and coarse luminance image detail. Selected signal differences from the low frequency spectrum are summed and threshold detected to determine motion in the coarse image detail. The high frequency spectrum of the sample differences are applied to parallel summing circuits which sum different combinations of sample differences in order to discriminate motion signals from non-moving chrominance transitions. The detection signals from the high and low frequency motion detectors are combined to produce a luminance motion signal. Interimage motion represented by the chrominance component is detected by combining selected ones of interimage signal sums. The interimage signal sums are high pass filtered and applied to parallel combining elements which discriminate chrominance motion from vertical luminance transitions.
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Citations
16 Claims
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1. A detector for detecting interimage motion in images represented by composite video signal comprising:
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an input terminal for applying composite video signal; delay means, coupled to said input terminal, for providing replicas of said composite video signal delayed by an integral number, including one, of image periods; means coupled to said input terminal and said delay means for providing differences of said composite video signal and said delayed composite video signal; means, including means coupled to said means for providing differences, for passing to a first output terminal, differences having frequency components normally occupied by chrominance components of said composite video signal to the relative exclusion of other frequency components of said composite video signal; first combining means coupled to said first output terminal for combining a plurality of differences, including a difference corresponding to an image point (pixel) under examination for motion, said plurality of differences corresponding to image points occurring in a horizontal image line containing said image point under examination and a horizontal image line preceding said horizontal image line containing said image point under examination; a first threshold detector, coupled to said first combining means, for producing a motion indicating signal when combined differences applied thereto exceed a predetermined magnitude; a second combining means, coupled to said first output terminal, for combining a plurality of differences including a difference corresponding to said image point under examination, said plurality of differences corresponding to image points occurring in a horizontal image line containing said image point under examination and a horizontal image line following said horizontal image line containing said image point under examination; a second threshold detector, coupled to said second combining means, for producing a motion indicating signal when combined differences applied thereto exceed a predetermined magnitude; means, coupled to said first and second threshold detectors, for providing at a second output terminal, a motion indicating signal whenever the first and second threshold detectors concurrently produce motion indicating signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A composite signal interimage motion detector comprising:
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a source of composite video signal; means coupled to said source for developing interimage difference samples, of corresponding signals from two image periods, from frequency components of said composite video signal containing fine luminance image detail information; first means, coupled to said means for developing difference samples, for combining a plurality of said difference samples, said plurality of difference samples including a difference sample corresponding to an image point currently under examination for interimage motion, and difference samples corresponding to image points proximate said image point under examination occurring in a horizontal image line containing said image point under examination and in a preceding horizontal image line to produce first combined difference samples; second means, coupled to said means for developing difference samples, for combining a plurality of said difference samples, said plurality of difference samples including a difference sample corresponding to said image point under examination, and difference samples corresponding to image points proximate said image point under examination occurring in said horizontal image line containing said image point under examination and in a succeeding horizontal image line to produce a second combined difference samples; means, coupled to said first and second combining means, for producing a fine detail luminance motion signal whenever said first and second combined difference samples concurrently exceed a predetermined magnitude value. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A signal interimage motion detector comprising:
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a source of video signal; means coupled to said source for producing difference samples corresponding to differences between video signals from successive image periods; first means, coupled to said means for producing difference samples, for combining a plurality of said difference samples, said plurality of difference samples including a difference sample corresponding to an image point currently under examination for interimage motion, and difference samples corresponding to image points proximate said image point under examination occurring in a horizontal image line containing said image point under examination and in a preceding horizontal image line to produce first combined difference samples; second means, coupled to said means for producing difference samples, for combining a plurality of said difference samples, said plurality of difference samples including a difference sample corresponding to said image point under examination, and difference samples corresponding to image points proximate said image point under examination occurring in said horizontal image line containing said image point under examination and in a succeeding horizontal image line to produce a second combined difference samples; means, coupled to said first and second combining means, for producing a motion signal whenever said first and second combined difference samples concurrently exceed a predetermined magnitude value.
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Specification