EP0089203A1
Expired / Lapsed
EP
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Charge-coupled device cameras
Assignee: Sony Corp
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Filing: 1983-03-11
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Granted: —
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Expires: 2003-03-11
Abstract
Abstract A charge-coupled device camera with a smear reducer circuit includes a charge-coupled device (20) for generating a pick-up signal, a memory (6) for storing a smear signal derived from the pick-up signal, and a level selector circuit (10) for eliminating a noise component contained in a smear signal of less than a predetermined level derived from the memory (6). The output of the level selector circuit (10) is subtracted from the pick-up signal thereby to obtain a pick-up signal with the smear reduced and the noise component suppressed.
Inventors
- 👤 Katsuro C/O Patent Division Miyata
- 👤 Takashi C/O Patent Division Asaida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:51
CPC Classifications
H; H04; H04N; H04N25/00; H04N25/60; H04N25/62; H04N25/625
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
A charge-coupled device camera in which a light shielding portion (la) of a solid state image pick-up device (20) is used to detect a smear signal, said smear signal is stored in a memory (6) and a smear signal derived from said memory (6) is subtracted from a pick-up signal thereby to perform a smear reducing operation, characterised by a level selector circuit (10) for selectively passing therethrough a smear signal of higher than a predetermined level and provided at the output side of said memory (6).
Claim 2
Dependent Claim
87 words
A charge-coupled device camera in which a light shielding portion (la) of a solid state image pick-up device (20) is used to detect a smear signal, said smear signal is stored in a memory (6) and a smear signal derived from said memory (6) is subtracted from a pick-up signal thereby to perform a smear reducing operation, characterised by a level selector circuit (10) for selectively passing therethrough a smear signal of higher than a predetermined level and provided at the output side of said memory (6).
Claim 3
Dependent Claim
16 words
A camera according to claim 1 wherein said level selector circuit (10) is a coring circuit.
Claim 4
Dependent Claim
127 words
A charge-coupled device camera in which a light shielding portion (1a) of a solid state image pick-up device (20) is used to detect a smear signal, said smear signal is stored in a memory (6) and a smear signal derived from said memory (6) is subtracted from a pick-up signal thereby to perform a smear reducing operation, characterised by a low-pass filter (11) connected to the output side of said memory (6), a subtractor (12) for subtracting an output of said low-pass filter (11) from an output of said memory (6), a level selector circuit (10) connected to an output side of said subtractor (12), and an adder (13) for adding an output from said level selector circuit (10) to the output of said low-pass filter (11).
Claim 5
Dependent Claim
127 words
A charge-coupled device camera in which a light shielding portion (1a) of a solid state image pick-up device (20) is used to detect a smear signal, said smear signal is stored in a memory (6) and a smear signal derived from said memory (6) is subtracted from a pick-up signal thereby to perform a smear reducing operation, characterised by a low-pass filter (11) connected to the output side of said memory (6), a subtractor (12) for subtracting an output of said low-pass filter (11) from an output of said memory (6), a level selector circuit (10) connected to an output side of said subtractor (12), and an adder (13) for adding an output from said level selector circuit (10) to the output of said low-pass filter (11).
Claim 6
Dependent Claim
16 words
A camera according to claim 3 wherein said level selector circuit (10) is a coring circuit.
Claim 7
Dependent Claim
55 words
A camera according to claim 1 further comprising a selector means (14) connected to the output side of said level selector circuit (10), said selector means (14) being operated to select either of the output from said level selector circuit (10) or a predetermined DC level in response to a level of said smear signal.
Claim 8
Dependent Claim
48 words
A camera according to claim 5 wherein said selector means (14) detects a level of the smear signal from the output of said level selector circuit (10) and selects the output of said level selector circuit (10) when said level of the smear signal exceeds the predetermined level.
Claim 9
Dependent Claim
42 words
A camera according to claim 1 further comprising a level varying means (19) connected to the output side of said level selector circuit (10), said level varying means (19) varying said level of the smear signal from said level selector circuit (10).
Claim 10
Dependent Claim
38 words
A camera according to claim 7 wherein said level varying means (19) detects the level of the smear signal from the output of said level selector circuit (10) and is controlled by the level of said smear signal.
Claim 11
Dependent Claim
20 words
A camera according to claim 1 wherein said solid state image pick-up device (20) is a frame transfer-type charge-coupled device.
Claim 12
Dependent Claim
19 words
A camera according to claim 1 wherein said solid state image pick-up device (20) is an interline-type charge-coupled device.
References Cited (Backward Citations)
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Cited
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Cited
GB1566923A
Cited
US4233632A
Cited
US4283742A
Cited
US4329709A
Cited
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