GB1417181A - Colour television cameras - Google Patents
Colour television camerasInfo
- Publication number
- GB1417181A GB1417181A GB177772A GB177772A GB1417181A GB 1417181 A GB1417181 A GB 1417181A GB 177772 A GB177772 A GB 177772A GB 177772 A GB177772 A GB 177772A GB 1417181 A GB1417181 A GB 1417181A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- luminance
- chrominance
- control signal
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Color Television Image Signal Generators (AREA)
Abstract
1417181 Colour television EMI Ltd 15 Jan 1973 [14 Jan 1972] 1777/72 Heading H4F In a colour television camera using a separate luminance pick-up tube 3, the amplitude of the luminance signal Y H is compared at 7 with a luminance signal Y L derived at 11 from the red, green and blue outputs of the chrominance tube or tubes 4, to provide a control signal to maintain the ratio between these two luminance signals constant, if, for example, the picture content changes due to operation of a zoom lens. The luminance tube receives light passed through a central aperture in a mirror included in a beam splitter 2, the peripheral light being passed to chrominance tube or tubes 4. The control signal may alter the area of the aperture defined by an iris 1 to alter the amount of light incident on the chrominance tube or tubes 4 or beam splitter 2 may include onr or more variable optical elements controlled by the control signal. Alternatively or additionally the control signal may control the ratio of the gain of luminance amplifier 5 to the gains of chrominance amplifiers 8, 9 and 10. For a camera using a single chrominance tube 4, the luminance signals Y L and Y H may be compared in a further circuit to provide a signal to register the scans in luminance tube 3 and chrominance tube 4.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB177772A GB1417181A (en) | 1972-01-14 | 1972-01-14 | Colour television cameras |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB177772A GB1417181A (en) | 1972-01-14 | 1972-01-14 | Colour television cameras |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1417181A true GB1417181A (en) | 1975-12-10 |
Family
ID=9727808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB177772A Expired GB1417181A (en) | 1972-01-14 | 1972-01-14 | Colour television cameras |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1417181A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2847858A1 (en) * | 1977-11-04 | 1979-05-10 | Ampex | HYBRID COLOR TV CAMERA |
GB2126828A (en) * | 1982-09-09 | 1984-03-28 | Link Electronics Ltd | Camera tube aperture compensation |
-
1972
- 1972-01-14 GB GB177772A patent/GB1417181A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2847858A1 (en) * | 1977-11-04 | 1979-05-10 | Ampex | HYBRID COLOR TV CAMERA |
FR2408263A1 (en) * | 1977-11-04 | 1979-06-01 | Ampex | HIGH PERFORMANCE COLOR TELEVISION CAMERA USING ANALYZER TUBE AND TRANSISTORIZED DETECTORS |
GB2126828A (en) * | 1982-09-09 | 1984-03-28 | Link Electronics Ltd | Camera tube aperture compensation |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PLNP | Patent lapsed through nonpayment of renewal fees |