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FR2351550A1 - Optical viewing system preventing light saturation - has differential reduction in path of light to primary sensor via given field of view dependent on illumination intensity - Google Patents

Optical viewing system preventing light saturation - has differential reduction in path of light to primary sensor via given field of view dependent on illumination intensity

Info

Publication number
FR2351550A1
FR2351550A1 FR7714900A FR7714900A FR2351550A1 FR 2351550 A1 FR2351550 A1 FR 2351550A1 FR 7714900 A FR7714900 A FR 7714900A FR 7714900 A FR7714900 A FR 7714900A FR 2351550 A1 FR2351550 A1 FR 2351550A1
Authority
FR
France
Prior art keywords
light
path
illumination intensity
viewing system
sensor via
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.)
Withdrawn
Application number
FR7714900A
Other languages
French (fr)
Inventor
Rodney William Waller
Colin Harold Gooch
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.)
Allard Way Holdings Ltd
Original Assignee
Elliott Brothers London 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.)
Filing date
Publication date
Application filed by Elliott Brothers London Ltd filed Critical Elliott Brothers London Ltd
Publication of FR2351550A1 publication Critical patent/FR2351550A1/en
Withdrawn legal-status Critical Current

Links

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
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/75—Circuitry for compensating brightness variation in the scene by influencing optical camera components

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Cameras (AREA)
  • Liquid Crystal (AREA)
  • Endoscopes (AREA)

Abstract

Optical viewing system has differential reduction in path of light to primary sensor via given field of the view dependent on illumination intensity. The lifht comes from different areas of the field of view. In operation, light from areas in which relatively high-intensive light sources exist is reduced to a greater degree than light which comes from other areas. The matrix reducer comprises a number of individually controlled cells, which consist of liquid crystals, so that their light transmission characteristics change. Thus, the intensity of light on the front plate of the camera tubes is greatly reduced.
FR7714900A 1976-05-15 1977-05-16 Optical viewing system preventing light saturation - has differential reduction in path of light to primary sensor via given field of view dependent on illumination intensity Withdrawn FR2351550A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2035676 1976-05-15

Publications (1)

Publication Number Publication Date
FR2351550A1 true FR2351550A1 (en) 1977-12-09

Family

ID=10144589

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7714900A Withdrawn FR2351550A1 (en) 1976-05-15 1977-05-16 Optical viewing system preventing light saturation - has differential reduction in path of light to primary sensor via given field of view dependent on illumination intensity

Country Status (2)

Country Link
DE (1) DE2722055A1 (en)
FR (1) FR2351550A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2495418A1 (en) * 1980-08-26 1982-06-04 Asahi Optical Co Ltd AUTOMATIC IMAGE DIVISION TYPE EXPOSURE CONTROL DEVICE FOR TELEVISION CAMERA
FR2604584A1 (en) * 1986-09-26 1988-04-01 Cornuejols Georges Device reducing or amplifying luminous contrasts for an audio-visual apparatus for filming, transferring or restoring images or for the human eye
FR2615966A1 (en) * 1987-06-01 1988-12-02 Framatome Sa DEVICE FOR TELEVISION MONITORING OF AN ARC WELDING OPERATION
FR2623957A1 (en) * 1987-11-27 1989-06-02 Cornuejols Georges Device for improving the dynamic range and the sensitivity of an image pick-up
EP0390714A1 (en) * 1989-03-28 1990-10-03 Scanera S.C. Device for transforming an initial image into a final image with non-linear amplification of point light intensities
WO1991012690A1 (en) * 1990-02-16 1991-08-22 Scanera S.C. Device for increasing the dynamic range of a camera
FR2658685A1 (en) * 1990-02-16 1991-08-23 Scanera Sc Ste Civile Rech Camera with very wide dynamic range
US5051770A (en) * 1986-01-20 1991-09-24 Scanera S.C. Image processing device for controlling the transfer function of an optical system
FR2660447A1 (en) * 1990-03-28 1991-10-04 Scanera Ste Civile Rech Optical device for the nonlinear processing of radiation and of images
WO1992003757A1 (en) * 1990-08-17 1992-03-05 Eastman Kodak Company Exposure balance arrangement for an image fixing device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS569718A (en) * 1979-07-04 1981-01-31 Canon Inc Electrochromic diaphragm device using liquid
DE3910159A1 (en) * 1989-03-21 1990-09-27 Stefan Weller Method for the touch-controlled windowing of a display which is effective in at least one step on at least one of four sides of a display at right-angles to each other
DE4118208A1 (en) * 1991-06-04 1991-11-07 Veit Dr Thomas Fast viewed displays control under variable lighting - uses light sensors for intensity, direction and spectrum and has liquid-crystal viewing panels
DE4305807A1 (en) * 1993-02-25 1994-10-13 Thomson Brandt Gmbh Camera with a controllable diaphragm
DE4420637A1 (en) * 1994-06-14 1995-12-21 Bertram Dr Rapp Optical imaging apparatus for photographic or video camera
DE19714434A1 (en) * 1997-04-08 1998-10-15 Armin Schaeuble Selective electronic photo-protective spectacles

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2495418A1 (en) * 1980-08-26 1982-06-04 Asahi Optical Co Ltd AUTOMATIC IMAGE DIVISION TYPE EXPOSURE CONTROL DEVICE FOR TELEVISION CAMERA
US5051770A (en) * 1986-01-20 1991-09-24 Scanera S.C. Image processing device for controlling the transfer function of an optical system
FR2604584A1 (en) * 1986-09-26 1988-04-01 Cornuejols Georges Device reducing or amplifying luminous contrasts for an audio-visual apparatus for filming, transferring or restoring images or for the human eye
EP0294274A1 (en) * 1987-06-01 1988-12-07 Framatome Televisual monitoring device in an arc-welding process
US4868649A (en) * 1987-06-01 1989-09-19 Framatome Apparatus for the televisual monitoring of an arc welding operation
FR2615966A1 (en) * 1987-06-01 1988-12-02 Framatome Sa DEVICE FOR TELEVISION MONITORING OF AN ARC WELDING OPERATION
FR2623957A1 (en) * 1987-11-27 1989-06-02 Cornuejols Georges Device for improving the dynamic range and the sensitivity of an image pick-up
EP0390714A1 (en) * 1989-03-28 1990-10-03 Scanera S.C. Device for transforming an initial image into a final image with non-linear amplification of point light intensities
WO1991012690A1 (en) * 1990-02-16 1991-08-22 Scanera S.C. Device for increasing the dynamic range of a camera
FR2658685A1 (en) * 1990-02-16 1991-08-23 Scanera Sc Ste Civile Rech Camera with very wide dynamic range
US5638119A (en) * 1990-02-16 1997-06-10 Scanera S.C. Device for increasing the dynamic range of a camera
FR2660447A1 (en) * 1990-03-28 1991-10-04 Scanera Ste Civile Rech Optical device for the nonlinear processing of radiation and of images
WO1992003757A1 (en) * 1990-08-17 1992-03-05 Eastman Kodak Company Exposure balance arrangement for an image fixing device

Also Published As

Publication number Publication date
DE2722055A1 (en) 1977-12-15

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Legal Events

Date Code Title Description
ST Notification of lapse