Patent US4688084A successfully refreshed from Google Patents.
US4688084A
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US
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Movement detection circuit for television signals
Assignee: Hitachi Ltd
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Filing: 1986-07-02
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Granted: 1987-08-18
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Expires: 2006-07-02
Abstract
Abstract Disclosed is a picture movement detection circuit for use for processing a color television signal, that is, a circuit for detecting temporal variations in chrominance signal level of a color televison picture. A signal corresponding to the magnitude of an absolute value, an amplitude, or the like, of a difference or addition signal between frames or field of a modulated chrominance signal of a color television signal is obtained, and a low frequency component is extracted out of the thus obtained signal so that the extracted low frequency component is used as movement information of the picture.
Inventors
- 👤 Masahiko Achiha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:58
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/646
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
A movement detection circuit for extracting movement information of an object included in a composite color television signal in which a chrominance signal modulated with a subcarrier frequency is superimposed on a luminance signal, said circuit comprising: a first filter for detecting temporal variations in said composite color television signal; a second filter for extracting a signal having the subcarrier frequency as its center frequency out of an output signal of said first filter; a converter having a non-linear characteristic for converting an output of said second filter into a coefficient representing the movement information; and a low-pass filter for passing a low frequency component of an output of said converter.
Claim 2
Dependent Claim
111 words
A movement detection circuit for extracting movement information of an object included in a composite color television signal in which a chrominance signal modulated with a subcarrier frequency is superimposed on a luminance signal, said circuit comprising: a first filter for detecting temporal variations in said composite color television signal; a second filter for extracting a signal having the subcarrier frequency as its center frequency out of an output signal of said first filter; a converter having a non-linear characteristic for converting an output of said second filter into a coefficient representing the movement information; and a low-pass filter for passing a low frequency component of an output of said converter.
Claim 3
Dependent Claim
26 words
A movement detection circuit according to claim 1, in which an input to said first filter is a digital signal of the composite color television signal.
Claim 4
Dependent Claim
25 words
A movement detection circuit according to claim 2, in which said converter is arranged to obtain an absolute value of an input signal applied thereto.
Claim 5
Dependent Claim
74 words
A movement detection circuit according to claim 2, in which said composite color television signal is an NTSC color television signal, and in which said first filter is constituted by a memory for delaying an input thereto by a period of 1050 H, 525 H, 263 H, or 262 H (H being one horizontal period) and an operation circuit for obtaining a difference or sum between an input and an output of said memory.
Claim 6
Dependent Claim
69 words
A movement detection circuit according to claim 2, in which said second filter is constituted by a line memory for delaying an input signal thereto by a period of 1 H (H being one horizontal period) and a band-pass filter for extracting a component in the vicinity of a component of said subcarrier frequency from a difference signal between an input and an output signal of said line memory.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |