EP0262623A2
Expired / Lapsed
EP
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Luminance signal forming circuit
Assignee: Sony Corp
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Filing: 1987-09-25
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Granted: —
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Expires: 2007-09-25
Abstract
Abstract A luminance signal is formed from a first luminance signal (Y1) produced by mixing a plurality of complementary color signals obtained from a television camera (2) having complementary color filters and from a second luminance signal (Y2) produced by mixing at a predetermined ratio a plurality of primary color signals that are derived from the plurality of complementary color signals, the first and second luminance signals (Y₁, Y₂) are then mixed so that the composite output signal (Y L+H ) forms the desired luminance signal.
Inventors
- 👤 Masatoshi Sase
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:35
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/80; H04N23/84; H04N23/88; H04N23/10; H04N23/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
127 words
A luminance signal forming circuit for a television camera (2) having complementary color filters and comprising a composing circuit (6, 7, 8, 11) combining a plurality of complementary color signals (W₁, Y E1 , C Y1 ) separated from an output from the television camera (2) to form a single luminance signal (Y1) characterized by a primary color signal circuit (15-19) for producing a second luminance signal (Y2) formed by mixing at a predetermined ratio a corresponding plurality of primary color signals (R₁, G₁ , B₁) derived from the plurality of complementary color signals, and a signal combining circuit (12, 20, 25) for combining the complementary color luminance signal (Y₁) and the primary color luminance signal (Y2) and forming a composite luminance output signal (Y L+H ).
Claim 2
Dependent Claim
127 words
A luminance signal forming circuit for a television camera (2) having complementary color filters and comprising a composing circuit (6, 7, 8, 11) combining a plurality of complementary color signals (W₁, Y E1 , C Y1 ) separated from an output from the television camera (2) to form a single luminance signal (Y1) characterized by a primary color signal circuit (15-19) for producing a second luminance signal (Y2) formed by mixing at a predetermined ratio a corresponding plurality of primary color signals (R₁, G₁ , B₁) derived from the plurality of complementary color signals, and a signal combining circuit (12, 20, 25) for combining the complementary color luminance signal (Y₁) and the primary color luminance signal (Y2) and forming a composite luminance output signal (Y L+H ).
Claim 3
Dependent Claim
69 words
A circuit according to claim 1, characterized in that a level balancing circuit (6) is provided for setting the plurality of complementary color signals at substantially an identical level and in that the primary color signal circuit comprises a white balancing circuit (16) for obtaining a plurality of whitebalanced primary color signals and a mixer (19) for mixing the plurality of white-balanced primary color signals at the predetermined ratio.
Claim 4
Dependent Claim
81 words
A circuit according to claim 2, characterized in that a color temperature detector (9) is provided in the camera (2) that detects a color temperature of an image detected by the camera and in which the level balancing circuit (6) comprises a first color temperature correction circuit (8) responsive to a detected image color temperature (CTE) for causing the level balancing circuit (6) to perform signal processing using a first correction signal obtained from the first color temperature correction circuit (8).
Claim 5
Dependent Claim
84 words
A circuit according to claim 2 or 3, characterized in that a color temperature detector (9) is provided in the camera (2) that detects a color temperature of an image detected by the camera (2) and in which the white balancing circuit (16) comprises a second color temperature correction circuit (18) responsive to a detected image color temperature (CTE) for causing the white balancing circuit (16) to perform signal processing using a second correction signal obtained from the second color temperature correction circuit (18).
Claim 6
Dependent Claim
120 words
A circuit according to claim 2, characterized in that a color temperature detector (9) is provided in the camera (2) that detects a color temperature of an image detected by the camera (2) and by a color temperature correction circuit (8) responsive to the detected image color temperature for causing one of the white balancing circuit (16) and the level balancing circuit (6) to perform signal processing in response to a color temperature correction signal (CTE) and a correction signal calculator (36) which produces a second color temperature correction signal from the first color temperature correction signal, with the second color temperature correction signal being fed to the other of the white balancing circuit (16) and level balancing circuit (6).
Claim 7
Dependent Claim
29 words
A circuit according to any one of claims 1 to 5, characterized in that a signal combining ratio of the signal combining circuit (12, 20, 25) is controlled (23).
Claim 8
Dependent Claim
27 words
A circuit according to claim 6, characterized in that the signal combining ratio is controlled in response to an amount of light incident on the camera (2).
Claim 9
Dependent Claim
33 words
A circuit according to claim 6 or 7, characterized in that the signal combining ratio is controlled by an AGC signal obtained from an automatic gain control circuit (10) in the camera (2).
References Cited (Backward Citations)
No citation records indexed.
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