FR2396325A1 - Automatic focussing system for an optical instrument - assesses smoothness of brightness change between scanned adjacent image elements to produce control signal for optical system - Google Patents

Automatic focussing system for an optical instrument - assesses smoothness of brightness change between scanned adjacent image elements to produce control signal for optical system

Info

Publication number
FR2396325A1
FR2396325A1 FR7819633A FR7819633A FR2396325A1 FR 2396325 A1 FR2396325 A1 FR 2396325A1 FR 7819633 A FR7819633 A FR 7819633A FR 7819633 A FR7819633 A FR 7819633A FR 2396325 A1 FR2396325 A1 FR 2396325A1
Authority
FR
France
Prior art keywords
smoothness
control signal
brightness change
assesses
optical
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.)
Granted
Application number
FR7819633A
Other languages
French (fr)
Other versions
FR2396325B1 (en
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.)
Olympus Corp
Original Assignee
Olympus Optical 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.)
Filing date
Publication date
Priority claimed from JP7894977A external-priority patent/JPS537038A/en
Application filed by Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Publication of FR2396325A1 publication Critical patent/FR2396325A1/en
Application granted granted Critical
Publication of FR2396325B1 publication Critical patent/FR2396325B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
    • G02B7/38—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals measured at different points on the optical axis, e.g. focussing on two or more planes and comparing image data

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

The automatic focussing system for a camera, microscope etc. employs appts. for scanning a number of picture elements in an image, with light sensors, such as photo-diodes, producing corresp. electrical signals. The signals are processed in circuitry including a picture element distributor, consisting of e.g. a shift registeR. Signal processing produces signals corresp. to differences in the brightness of adjacent picture elements from which the smoothness of brightness change is derived. A signal is produced by calculation to have a max. value when the image is sharly focussed. A control signal is derived from controlling the movement of a lens to give an image of desire sharpness.
FR7819633A 1977-07-01 1978-06-30 Automatic focussing system for an optical instrument - assesses smoothness of brightness change between scanned adjacent image elements to produce control signal for optical system Granted FR2396325A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7894977A JPS537038A (en) 1976-07-02 1977-07-01 Control system for controlling automatic gear box of vehicle

Publications (2)

Publication Number Publication Date
FR2396325A1 true FR2396325A1 (en) 1979-01-26
FR2396325B1 FR2396325B1 (en) 1982-07-30

Family

ID=13676130

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7819633A Granted FR2396325A1 (en) 1977-07-01 1978-06-30 Automatic focussing system for an optical instrument - assesses smoothness of brightness change between scanned adjacent image elements to produce control signal for optical system

Country Status (1)

Country Link
FR (1) FR2396325A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2449293A1 (en) * 1979-02-13 1980-09-12 Asahi Optical Co Ltd DEVICE FOR DETECTING THE FOCUSING OF A CAMERA
EP0017726A1 (en) * 1979-03-20 1980-10-29 Kernforschungszentrum Karlsruhe Gmbh Method and device for automatically focusing an image
FR2472766A1 (en) * 1979-12-29 1981-07-03 Asahi Optical Co Ltd METHOD AND DEVICE FOR DETECTING FOCUS FOR SHOOTING APPARATUS, IN PARTICULAR
FR2502354A1 (en) * 1981-03-17 1982-09-24 Sony Corp AUTOMATIC FOCUSING APPARATUS FOR A VIEWING APPARATUS SUCH AS A VARIABLE FOCAL TELEVISION CAMERA
GB2435942A (en) * 2006-03-07 2007-09-12 Samsung Electro Mech Automatic focusing.
CN113347361A (en) * 2021-06-07 2021-09-03 深圳市英特飞电子有限公司 Zoom lens automatic focusing method and device, computer equipment and storage medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2514230A1 (en) * 1974-04-01 1975-10-09 Canon Kk SYSTEM FOR EXPOSURE MEASUREMENT AND / OR FOR FOCUS DETERMINATION WITH THE HELP OF AN IMAGE SENSOR
DE2551070A1 (en) * 1974-11-13 1976-05-26 Canon Kk METHOD OF DETERMINING THE SHARPNESS OF AN OBJECT IMAGE

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2514230A1 (en) * 1974-04-01 1975-10-09 Canon Kk SYSTEM FOR EXPOSURE MEASUREMENT AND / OR FOR FOCUS DETERMINATION WITH THE HELP OF AN IMAGE SENSOR
DE2559559A1 (en) * 1974-04-01 1977-06-16 Canon Kk CAMERA WITH EXPOSURE METERING SYSTEM
DE2551070A1 (en) * 1974-11-13 1976-05-26 Canon Kk METHOD OF DETERMINING THE SHARPNESS OF AN OBJECT IMAGE

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2449293A1 (en) * 1979-02-13 1980-09-12 Asahi Optical Co Ltd DEVICE FOR DETECTING THE FOCUSING OF A CAMERA
EP0017726A1 (en) * 1979-03-20 1980-10-29 Kernforschungszentrum Karlsruhe Gmbh Method and device for automatically focusing an image
FR2472766A1 (en) * 1979-12-29 1981-07-03 Asahi Optical Co Ltd METHOD AND DEVICE FOR DETECTING FOCUS FOR SHOOTING APPARATUS, IN PARTICULAR
FR2502354A1 (en) * 1981-03-17 1982-09-24 Sony Corp AUTOMATIC FOCUSING APPARATUS FOR A VIEWING APPARATUS SUCH AS A VARIABLE FOCAL TELEVISION CAMERA
GB2435942A (en) * 2006-03-07 2007-09-12 Samsung Electro Mech Automatic focusing.
GB2435942B (en) * 2006-03-07 2008-05-14 Samsung Electro Mech Auto-focusing method and auto-focusing apparatus using the same
CN113347361A (en) * 2021-06-07 2021-09-03 深圳市英特飞电子有限公司 Zoom lens automatic focusing method and device, computer equipment and storage medium

Also Published As

Publication number Publication date
FR2396325B1 (en) 1982-07-30

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Legal Events

Date Code Title Description
ST Notification of lapse