GB1091170A – Improvements in or relating to colour television cameras
– Google Patents
GB1091170A – Improvements in or relating to colour television cameras
– Google Patents
Improvements in or relating to colour television cameras
Info
Publication number
GB1091170A
GB1091170A
GB19415/65A
GB1941565A
GB1091170A
GB 1091170 A
GB1091170 A
GB 1091170A
GB 19415/65 A
GB19415/65 A
GB 19415/65A
GB 1941565 A
GB1941565 A
GB 1941565A
GB 1091170 A
GB1091170 A
GB 1091170A
Authority
GB
United Kingdom
Prior art keywords
line
raster
pulses
pulse
areas
Prior art date
1965-05-07
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
Application number
GB19415/65A
Inventor
William James Rowley Clark
William Edward Hobbs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co Ltd
Priority date (The priority date 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 date listed.)
1965-05-07
Filing date
1965-05-07
Publication date
1967-11-15
1965-05-07
Application filed by Marconi Co Ltd
filed
Critical
Marconi Co Ltd
1965-05-07
Priority to GB19415/65A
priority
Critical
patent/GB1091170A/en
1966-03-21
Priority to SE03722/66A
priority
patent/SE346895B/xx
1966-04-11
Priority to US541691A
priority
patent/US3471634A/en
1966-05-05
Priority to NL666606113A
priority
patent/NL149663B/en
1966-05-05
Priority to DE1462777A
priority
patent/DE1462777C3/en
1966-05-06
Priority to CH662266A
priority
patent/CH457546A/en
1966-05-06
Priority to FR1555487D
priority
patent/FR1555487A/fr
1967-11-15
Publication of GB1091170A
publication
Critical
patent/GB1091170A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
H04N23/13—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths with multiple sensors
H04N23/15—Image signal generation with circuitry for avoiding or correcting image misregistration
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
H04N23/13—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths with multiple sensors
Abstract
1,091,170. Colour television cameras. MARCONI CO. Ltd. March 1, 1966 [May 7, 1965], No. 19415/65. Heading H4F. In a multi-tube colour television camera automatic control of the position and size of the scanned raster in each tube is effected with the aid of optical mask means, Fig. 2, which surrounds the picture area P and incorporates reference areas a-h, whereby during the scanning of the raster area F there are generated pulse signals as illustrated in Fig. 3 for lines in the raster occurring at positions (I)-(VII). The pulses are separated from the picture representative components by gate circuits controlled by line and field blanking signals and are then compared in time with pulses derived from the camera line and field drive pulses to produce error signals, in dependence upon one difference in time, which are employed for the automatic control of the scanning circuits shift and amplitude. The line shift of the raster is controlled with the aid of reference areas b and g which are located midway across the picture area. The resulting pulses are compared with pulses which are derived from a train of drive pulses at twice line frequency and timed to occur exactly at the middle of a correctly scanned line. The field shift of the raster is controlled with the aid of areas d and e which are located midway down the picture area. The pulses are used to produce a pulse lasting from the onset of the first until the onset of the second, and hence of the duration of approximately one scanning line, and this is compared with a pulse of like duration which is derived by counting down line frequency drive pulses and arranged to occur half-way through a correctly scanned raster. The line size of the raster is controlled with aid of reference area a, the resulting pulse being compared with a pulse derived from the line drive pulse and briefly delayed to allow for the slight inset of the area with respect to the edge of the raster. The field size of the raster is controlled with the aid of areas a and c. The pulses are used to produce a pulse lasting from the onset of the first to the onset of the second, and hence of the duration of approximately one line, and this is compared with a pulse of like duration which is derived from the line drive pulses and timed to occur during the fifth line of a field when areas a and c are scanned. The pulse comparisons are made by feeding the pulses to be compared to the inputs of a differential amplifier which feeds a pair of linear ramp voltage generators whose maximum outputs are detected. By this means there is produced an error signal of amplitude and sign determined by the magnitude and direction of any timing error. Four such arrangements are required for the four controls which are required for the raster of one pick-up tube. A group of four arrangements may be provided for each tube, or one group may control the tubes in succession, the scanning circuits being arranged to retain the adjustments imparted by the error voltages between the periods of control. The error voltages may control the scanning circuits electromechanically, e.g. by adjustment of resistance elements, or wholly electrically. Detailed arrangements for carrying out the invention are described (in block diagram form only) with reference to Figs. 4 and 5 (not shown). The invention is mainly described with reference to three-tube cameras, although reference is made to a two-tube camera. The mask shown in Fig. 2 may be included in a common part of the optical path to the camera tubes so as from the picture area of all the tubes. Alternatively, a separate mask may be provided for each tube. Although not all the reference areas are utilized in the arrangements described above the remaining areas are included so as to provide a symmetrical system which will function if the directions of scan are reversed. The reference areas are located outside the picture area so that the pulse signals occur in the line and field blanking intervals. Alternatively, they may be located within the picture area in the peripheral areas which are masked in reproducer tubes. As a further alternative, a pattern of reference areas occupying the picture area may be exposed to the camera by a shutter during fields which are well spaced in time, e.g. at 50 field intervals, so as not to be particularly noticeable to viewers.
GB19415/65A
1965-05-07
1965-05-07
Improvements in or relating to colour television cameras
Expired
GB1091170A
(en)
Priority Applications (7)
Application Number
Priority Date
Filing Date
Title
GB19415/65A
GB1091170A
(en)
1965-05-07
1965-05-07
Improvements in or relating to colour television cameras
SE03722/66A
SE346895B
(en)
1965-05-07
1966-03-21
US541691A
US3471634A
(en)
1965-05-07
1966-04-11
Colour television cameras
NL666606113A
NL149663B
(en)
1965-05-07
1966-05-05
COLOR TV CAMERA WITH A NUMBER OF TAKING TUBES.
DE1462777A
DE1462777C3
(en)
1965-05-07
1966-05-05
Color television camera with several tubes and means for independent adjustment of the grid coverage
CH662266A
CH457546A
(en)
1965-05-07
1966-05-06
Multitube color television camera
FR1555487D
FR1555487A
(en)
1965-05-07
1966-05-06
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB19415/65A
GB1091170A
(en)
1965-05-07
1965-05-07
Improvements in or relating to colour television cameras
Publications (1)
Publication Number
Publication Date
GB1091170A
true
GB1091170A
(en)
1967-11-15
Family
ID=10128975
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB19415/65A
Expired
GB1091170A
(en)
1965-05-07
1965-05-07
Improvements in or relating to colour television cameras
Country Status (7)
Country
Link
US
(1)
US3471634A
(en)
CH
(1)
CH457546A
(en)
DE
(1)
DE1462777C3
(en)
FR
(1)
FR1555487A
(en)
GB
(1)
GB1091170A
(en)
NL
(1)
NL149663B
(en)
SE
(1)
SE346895B
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2015577A1
(en)
*
1968-08-13
1970-04-30
Marconi Co Ltd
Families Citing this family (5)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB1272970A
(en)
*
1969-07-29
1972-05-03
Marconi Co Ltd
Improvements in or relating to colour television cameras
GB1273193A
(en)
*
1969-10-01
1972-05-03
Marconi Co Ltd
Improvements in or relating to colour television cameras
NL7511841A
(en)
*
1975-10-09
1977-04-13
Philips Nv
TELEVISION ROOM.
US4133003A
(en)
*
1977-10-11
1979-01-02
Rca Corporation
Raster registration system for a television camera
US4500916A
(en)
*
1982-04-05
1985-02-19
Panavision, Inc.
Automatic on-air registration system and method for color TV camera
Family Cites Families (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2611816A
(en)
*
1948-02-28
1952-09-23
Rca Corp
Deflection control system
US2594382A
(en)
*
1948-09-09
1952-04-29
Rca Corp
Registration monitoring
US2594383A
(en)
*
1948-09-29
1952-04-29
Rca Corp
Registration monitoring
BE630121A
(en)
*
1962-03-27
1965
1965-05-07
GB
GB19415/65A
patent/GB1091170A/en
not_active
Expired
1966
1966-03-21
SE
SE03722/66A
patent/SE346895B/xx
unknown
1966-04-11
US
US541691A
patent/US3471634A/en
not_active
Expired – Lifetime
1966-05-05
DE
DE1462777A
patent/DE1462777C3/en
not_active
Expired
1966-05-05
NL
NL666606113A
patent/NL149663B/en
not_active
IP Right Cessation
1966-05-06
FR
FR1555487D
patent/FR1555487A/fr
not_active
Expired
1966-05-06
CH
CH662266A
patent/CH457546A/en
unknown
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2015577A1
(en)
*
1968-08-13
1970-04-30
Marconi Co Ltd
Also Published As
Publication number
Publication date
CH457546A
(en)
1968-06-15
NL149663B
(en)
1976-05-17
NL6606113A
(en)
1966-11-08
SE346895B
(en)
1972-07-17
DE1462777B2
(en)
1975-02-06
DE1462777A1
(en)
1968-12-19
FR1555487A
(en)
1969-01-31
US3471634A
(en)
1969-10-07
DE1462777C3
(en)
1975-10-02
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None