US4884136A
Expired / Lapsed
US
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Motion detection circuit
Assignee: Japan Broadcasting Corp
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Filing: 1988-09-28
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Granted: 1989-11-28
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Expires: 2008-09-28
Abstract
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.
Inventors
- 👤 Yuichi Ninomiya
- 👤 Yoshimichi Ohtsuka
- 👤 Yoshinori Izumi
- 👤 Seiichi Gohshi
- 👤 Yoshiaki Shishikui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:52
CPC Classifications
H; H04; H04N; H04N9/00; H04N7/00; H04N7/015; H04N7/0152; H04N19/00; H04N19/50; H04N19/503; H04N5/00; H04N5/14; H04N5/144
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
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.
Claim 2
Dependent Claim
99 words
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.
Claim 3
Dependent Claim
29 words
A motion detection circuit according to claim 1, wherein the filter means comprises filter means for removing the aliased portion of the interframe difference signal in the horizontal direction.
Claim 4
Dependent Claim
40 words
A motion detection circuit according to claim 1, wherein the filter means comprises filter means for removing the aliased portion of the interframe difference signal in the horizontal direction and another filter means for removing that in the vertical direction.
Claim 5
Dependent Claim
36 words
A motion detection circuit according to claim 1, wherein the mixing means non-linearly mixes the absolute value of the level of said image signal and the absolute value of the output signal from the detection means.
Claim 6
Dependent Claim
27 words
A motion detection circuit according to claim 1, wherein the producing means for producing the interframe difference signal is constituted by frame memory means and a substracter.
Claim 7
Dependent Claim
36 words
A motion detection circuit according to claim 1, wherein the mixing means linearly mixes the absolute value of the level of the image signal and the absolute value of the output signal from the detection means.
Claim 8
Dependent Claim
37 words
A motion detection circuit according to claim 6, wherein weighting coefficients are provided to the absolute value of the level of the image signal and the absolute value of the output signal from the detection means, respectively.
References Cited (Backward Citations)
US4785351A
Cited
US4760446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |