JPS5574505A - Focus position detecting system of image - Google Patents

Focus position detecting system of image

Info

Publication number
JPS5574505A
JPS5574505A JP14809078A JP14809078A JPS5574505A JP S5574505 A JPS5574505 A JP S5574505A JP 14809078 A JP14809078 A JP 14809078A JP 14809078 A JP14809078 A JP 14809078A JP S5574505 A JPS5574505 A JP S5574505A
Authority
JP
Japan
Prior art keywords
sensor
image
time series
positions
evaluation indices
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.)
Pending
Application number
JP14809078A
Other languages
Japanese (ja)
Inventor
Mitsuya Horie
Takao Kinoshita
Takashi Kawabata
Tokuichi Tsunekawa
Toshio Sakane
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP14809078A priority Critical patent/JPS5574505A/en
Priority to DE19792948300 priority patent/DE2948300A1/en
Publication of JPS5574505A publication Critical patent/JPS5574505A/en
Pending 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)
  • Focusing (AREA)

Abstract

PURPOSE: To perform highly accurate focusing with a simple constitution by giving the specified weights to the time series illuminance signals of the proximate two positions at the image scanning with an image sensor or the like then subsequently integrating the same and making image evaluation indices.
CONSTITUTION: The image sensor 3 provided in the oposition optically conjugate with the film plane or the like is scanned and driven by a driver 4 and the time series illuminance signals of the proximate two positions of the images formed in the sensor 3 by the respective photoelectric transduces of the sensor 3 are detected by a delay circuit 8, differential amplifier 9, etc. The illuminance difference detection signals are weighted by a gamma conversion circuit 11 and are subsequently integrated in an integrating circuit 12. If these integrated outputs as imaging evaluation indices are compared with the similar imaging evaluation indices of the case when optical lengths have changed by an optical path length changeover means 14 which is driven in synchronization with the time series scanning of the sensor 3 and the means 14 is feedback-controlled, then the positions before and after the focusing are detected together with the focus position.
COPYRIGHT: (C)1980,JPO&Japio
JP14809078A 1978-11-30 1978-11-30 Focus position detecting system of image Pending JPS5574505A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP14809078A JPS5574505A (en) 1978-11-30 1978-11-30 Focus position detecting system of image
DE19792948300 DE2948300A1 (en) 1978-11-30 1979-11-30 Camera focus evaluation system - detects image displacement from focal plane using single image sensor and image plane shifting control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14809078A JPS5574505A (en) 1978-11-30 1978-11-30 Focus position detecting system of image

Publications (1)

Publication Number Publication Date
JPS5574505A true JPS5574505A (en) 1980-06-05

Family

ID=15445006

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14809078A Pending JPS5574505A (en) 1978-11-30 1978-11-30 Focus position detecting system of image

Country Status (2)

Country Link
JP (1) JPS5574505A (en)
DE (1) DE2948300A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4958826A (en) * 1972-10-04 1974-06-07
JPS52110030A (en) * 1976-03-12 1977-09-14 Canon Inc Detector for distinctness of object image

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047187A (en) * 1974-04-01 1977-09-06 Canon Kabushiki Kaisha System for exposure measurement and/or focus detection by means of image senser
US4470676A (en) * 1978-07-28 1984-09-11 Canon Kabushiki Kaisha Focus detecting device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4958826A (en) * 1972-10-04 1974-06-07
JPS52110030A (en) * 1976-03-12 1977-09-14 Canon Inc Detector for distinctness of object image

Also Published As

Publication number Publication date
DE2948300A1 (en) 1980-06-19
DE2948300C2 (en) 1988-07-21

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