Motion detection circuit
First Claim
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1. A motion detection circuit comprising:
- means for producing a interframe difference signal of a sub-sampled image signal;
filter means for removing, from the interframe difference signal outputted from the producing means, its aliased portion;
detection means for detecting an edge of the image signal;
mixing means for mixing an absolute value of a level of the image signal and an absolute value of an output signal from the detection means; and
dividing means for dividing an absolute value of an output signal from the filter means by an output signal from the mixing means to provide a motion signal.
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Abstract
The motion detection circuit is so constructed that an interframe difference signal is passed through a horizontal direction LPF and a vertical direction LPF in cascade connection, and the interframe difference signal thus obtained is divided by the value obtained by mixing an edge signal of an image and the image level signal of the image by a mixing circuit, thus providing a motion signal.
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Citations
7 Claims
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1. A motion detection circuit comprising:
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means for producing a interframe difference signal of a sub-sampled image signal; filter means for removing, from the interframe difference signal outputted from the producing means, its aliased portion; detection means for detecting an edge of the image signal; mixing means for mixing an absolute value of a level of the image signal and an absolute value of an output signal from the detection means; and dividing means for dividing an absolute value of an output signal from the filter means by an output signal from the mixing means to provide a motion signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification