GB1163107A - Compensating for Vignetting in Television Systems. - Google Patents

Compensating for Vignetting in Television Systems.

Info

Publication number
GB1163107A
GB1163107A GB53718/66A GB5371866A GB1163107A GB 1163107 A GB1163107 A GB 1163107A GB 53718/66 A GB53718/66 A GB 53718/66A GB 5371866 A GB5371866 A GB 5371866A GB 1163107 A GB1163107 A GB 1163107A
Authority
GB
United Kingdom
Prior art keywords
horizontal
vertical
reproduced picture
paraboli
corrected
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
Application number
GB53718/66A
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.)
Siemens AG
Original Assignee
Siemens AG
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.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1163107A publication Critical patent/GB1163107A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/30—Transforming light or analogous information into electric information
    • H04N5/32—Transforming X-rays

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Details Of Television Scanning (AREA)

Abstract

1,163,107. Television. SIEMENS A.G. 30 Nov., 1966 [1 Dec., 1965], No. 53718/66. Heading H4F. If, for example, as in the televising of low intensity X-ray pictures, use is made of a wide aperture lens to project the pictures on to the camera screen, the projected image will show a falling off of intensity at its periphery, i.e. vignetting, resulting in corresponding edge darkness in the reproduced picture. To overcome this, the invention proposes the integration of the television horizontal and vertical sawtooth voltages about the average valves thereof, to produce corresponding paraboli having maxima of either end thereof and the summation of the plurality of " horizontal " paraboli and the " vertical " parabola, occuring during one field to form a correcting signal which is added in synchronism to the video signal issuing from the television camera whereby the " horizontal " paraboli cause compensating brightening of each vertical edge of the reproduced picture, and the " vertical " parabola causes compensating brightness of each horizontal edge. To allow for variations of the brightness of the initial video signal, the correcting signal is amplified in proportion to the average brightness of the line being corrected. Since each corner of the thus corrected reproduced picture may be over-bright, blanking of the corrected signal is employed such that the reproduced picture is circular.
GB53718/66A 1965-12-01 1966-11-30 Compensating for Vignetting in Television Systems. Expired GB1163107A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES0100753 1965-12-01

Publications (1)

Publication Number Publication Date
GB1163107A true GB1163107A (en) 1969-09-04

Family

ID=7523273

Family Applications (1)

Application Number Title Priority Date Filing Date
GB53718/66A Expired GB1163107A (en) 1965-12-01 1966-11-30 Compensating for Vignetting in Television Systems.

Country Status (2)

Country Link
FR (1) FR1502479A (en)
GB (1) GB1163107A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196351A (en) * 1977-06-03 1980-04-01 Albert Richard David Scanning radiographic apparatus
US4323779A (en) * 1977-06-03 1982-04-06 Albert Richard David Scanning radiographic method
GB2128846A (en) * 1982-09-22 1984-05-02 Bpt Spa Photographic recording from a video monitor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6040752B2 (en) * 1979-02-05 1985-09-12 株式会社東芝 X-ray television equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196351A (en) * 1977-06-03 1980-04-01 Albert Richard David Scanning radiographic apparatus
US4323779A (en) * 1977-06-03 1982-04-06 Albert Richard David Scanning radiographic method
GB2128846A (en) * 1982-09-22 1984-05-02 Bpt Spa Photographic recording from a video monitor

Also Published As

Publication number Publication date
DE1462016A1 (en) 1968-12-19
FR1502479A (en) 1967-11-18
DE1462016B2 (en) 1971-12-09

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Legal Events

Date Code Title Description
429A Application made for amendment of specification (sect. 29/1949)
429H Application (made) for amendment of specification now open to opposition (sect. 29/1949)
429D Case decided by the comptroller ** specification amended (sect. 29/1949)
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee