JPS56123506A - Detecting method of focussing - Google Patents

Detecting method of focussing

Info

Publication number
JPS56123506A
JPS56123506A JP2672780A JP2672780A JPS56123506A JP S56123506 A JPS56123506 A JP S56123506A JP 2672780 A JP2672780 A JP 2672780A JP 2672780 A JP2672780 A JP 2672780A JP S56123506 A JPS56123506 A JP S56123506A
Authority
JP
Japan
Prior art keywords
element information
picture element
detection
digital
constitution
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
JP2672780A
Other languages
Japanese (ja)
Inventor
Takeomi Suzuki
Masahiro Aoki
Kenichi Oikami
Masatoshi Ida
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
Application filed by Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP2672780A priority Critical patent/JPS56123506A/en
Publication of JPS56123506A publication Critical patent/JPS56123506A/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

Landscapes

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

Abstract

PURPOSE:To simplify the constitution and to enable the detection of focus quickly and with high accuracy, by comparing parallelly between the D/A conversion value of a digital output of CPU and a plurality of picture element information and deciding the A/D conversion range and digitizing the picture element information. CONSTITUTION:Digital values LH, L1, L2, LL determining the range of A/D conversion such as 3 stages A-C, with CPU5, are sequentially converted into analog values at a D/A converter 20, and the ranges A-C corresponding to the picture element information are decided via the OR circuit 23, through the parallel comparison with the picture element information in sample-hold at capacitors 181... through the detection of the photodetecting array 3A corresponding to the picture elements with comparators 191.... Then, the CPU5 transmits the digital reference signal sequentially changed in the determined ranges A-C, and with the same processing, picture element information can surely be digitized with quick processing even with weak contrast by a simple constitution in parallel comparison by an AND circuit 23, digital memory 211..., and decoder 24. Thus, the detection of focus can quickly be made with high accuracy.
JP2672780A 1980-03-05 1980-03-05 Detecting method of focussing Pending JPS56123506A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2672780A JPS56123506A (en) 1980-03-05 1980-03-05 Detecting method of focussing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2672780A JPS56123506A (en) 1980-03-05 1980-03-05 Detecting method of focussing

Publications (1)

Publication Number Publication Date
JPS56123506A true JPS56123506A (en) 1981-09-28

Family

ID=12201348

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2672780A Pending JPS56123506A (en) 1980-03-05 1980-03-05 Detecting method of focussing

Country Status (1)

Country Link
JP (1) JPS56123506A (en)

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