Patent US4364087A successfully refreshed from Google Patents.
US4364087A
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Movement detector for television signals
Assignee: British Broadcasting Corp
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Filing: 1980-08-01
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Granted: 1982-12-14
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Expires: 2000-08-01
Abstract
Abstract A movement detector for television signals measures the difference between maximum and minimum values of the movement components of a picture difference signal over a chosen interval. A television signal at an input (12) is delayed in a picture delay (2), and the delayed and undelayed signals subtracted in a subtractor (1) to form a picture difference signal. This is rectified in rectifier (3) and smoothed in a filter (4). A maximum detector (6) and a minimum detector (7) are coupled to the filter output and are re-set at prescribed intervals. A subtractor (8) determines the difference between the output of detectors (6) and (7) and this is compared with a reference value in a comparator (9), the output of which is sampled and stored in a store (10).
Inventors
- 👤 Richard Storey
- 👤 Alan Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:10
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/144; H04N5/147
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
90 words
A movement detector for detecting movement in selected picture areas of a video signal, comprising: an input for receiving an input video signal; difference signal generating means connected to the input for generating a signal representative of the difference between the input signal on two different field scans; extreme value determining means for determining for a selected area or areas of the picture maximum and minimum values of the difference signal; and comparing means for comparing the value of said maximum value minus said minimum value with a reference value.
Claim 2
Dependent Claim
90 words
A movement detector for detecting movement in selected picture areas of a video signal, comprising: an input for receiving an input video signal; difference signal generating means connected to the input for generating a signal representative of the difference between the input signal on two different field scans; extreme value determining means for determining for a selected area or areas of the picture maximum and minimum values of the difference signal; and comparing means for comparing the value of said maximum value minus said minimum value with a reference value.
Claim 3
Dependent Claim
38 words
A movement detector according to claim 1, in which the difference signal generating means comprises a picture delay connected to the input and a combining circuit for determining the difference between the input signal and the picture-delayed signal.
Claim 4
Dependent Claim
29 words
A movement detector according to claim 1 or 2, including a two-dimensional (vertical, and horizontal/time) filter connected between the difference signal generating means and the extreme value determining means.
Claim 5
Dependent Claim
30 words
A movement detector according to claim 3, in which the filter comprises an integrator for providing an integration output, and a sample-and-hold circuit connected to the output of the integrator.
Claim 6
Dependent Claim
35 words
A movement detector according to claim 1, in which the extreme value determining means comprises a resettable maximum detector and a resettable minimum detector both connected to the output of the difference signal generating means.
Claim 7
Dependent Claim
26 words
A movement detector according to claim 5, in which the maximum and minimum detectors are reset at points which form a regular lattice on the picture.
Claim 8
Dependent Claim
25 words
A movement detector according to claim 1, in which the comparing means comprises a subtractor, and a comparator which is supplied with a reference value.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |