JPS6454408A - Automatic focusing method - Google Patents

Automatic focusing method

Info

Publication number
JPS6454408A
JPS6454408A JP20931587A JP20931587A JPS6454408A JP S6454408 A JPS6454408 A JP S6454408A JP 20931587 A JP20931587 A JP 20931587A JP 20931587 A JP20931587 A JP 20931587A JP S6454408 A JPS6454408 A JP S6454408A
Authority
JP
Japan
Prior art keywords
contrast
focusing
positions
threshold
placing table
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
JP20931587A
Other languages
Japanese (ja)
Inventor
Makoto Shinoda
Masaichi Baba
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP20931587A priority Critical patent/JPS6454408A/en
Publication of JPS6454408A publication Critical patent/JPS6454408A/en
Pending legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To reduce variance in a focusing time by obtaining three continuous positions where the contrast on the intermediate position is maximum within a range where the contrast is a threshold or above and aligning a position obtained by using the values of the contrast in the respective positions and executing a weighted average operation as a focusing position. CONSTITUTION:An image processing part 77 processes a signal from an image sensor 76 according to automatic focusing algorithm which is carried out and a placing table 71 placing an object 70 is driven through a placing table driving device 78 based on the processed result so as to execute automatic focusing. Namely, by detecting the movement and the contrast of the placing table 71, a position where the contrast is the threshold or above is searched and from the range where the contrast is the threshold or above, three positions where the contrast is near a peak value are obtained so as to decide the focusing position with the weighted average operation by using three positions. Thus, the focusing time can be shortened and focusing in which variance is small can be executed.
JP20931587A 1987-08-25 1987-08-25 Automatic focusing method Pending JPS6454408A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20931587A JPS6454408A (en) 1987-08-25 1987-08-25 Automatic focusing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20931587A JPS6454408A (en) 1987-08-25 1987-08-25 Automatic focusing method

Publications (1)

Publication Number Publication Date
JPS6454408A true JPS6454408A (en) 1989-03-01

Family

ID=16570917

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20931587A Pending JPS6454408A (en) 1987-08-25 1987-08-25 Automatic focusing method

Country Status (1)

Country Link
JP (1) JPS6454408A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04180511A (en) * 1990-11-14 1992-06-26 Nippon Steel Corp Method for refining chromium-containing molten steel by decarburization
JPH10502466A (en) * 1994-07-01 1998-03-03 ジェフレイ エイチ． プライス， Autofocus system for scanning microscopy
JP2004163499A (en) * 2002-11-11 2004-06-10 Matsushita Electric Ind Co Ltd Cell observation method
JP2005284203A (en) * 2004-03-31 2005-10-13 Fuji Photo Film Co Ltd Digital still camera and its control method
JP2006221918A (en) * 2005-02-09 2006-08-24 Jeol Ltd Measuring method of testpiece surface, analysis device and electron beam device
JP2007003655A (en) * 2005-06-22 2007-01-11 Fujifilm Holdings Corp Apparatus for determining focal position of imaging lens and method thereof
JP2007003656A (en) * 2005-06-22 2007-01-11 Fujifilm Holdings Corp Apparatus for determining focal position of imaging lens and method thereof
JP2007219029A (en) * 2006-02-15 2007-08-30 Sharp Corp Automatic focusing device
CN103364921A (en) * 2012-03-29 2013-10-23 奥林巴斯映像株式会社 Focus adjustment unit and camera system
US10705325B2 (en) 2014-02-24 2020-07-07 Olympus Corporation Focusing method, measuring method, principal point detecting method, focusing device, measuring device, and principal point detecting device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04180511A (en) * 1990-11-14 1992-06-26 Nippon Steel Corp Method for refining chromium-containing molten steel by decarburization
JPH10502466A (en) * 1994-07-01 1998-03-03 ジェフレイ エイチ． プライス， Autofocus system for scanning microscopy
JP2004163499A (en) * 2002-11-11 2004-06-10 Matsushita Electric Ind Co Ltd Cell observation method
JP2005284203A (en) * 2004-03-31 2005-10-13 Fuji Photo Film Co Ltd Digital still camera and its control method
JP2006221918A (en) * 2005-02-09 2006-08-24 Jeol Ltd Measuring method of testpiece surface, analysis device and electron beam device
JP2007003655A (en) * 2005-06-22 2007-01-11 Fujifilm Holdings Corp Apparatus for determining focal position of imaging lens and method thereof
JP2007003656A (en) * 2005-06-22 2007-01-11 Fujifilm Holdings Corp Apparatus for determining focal position of imaging lens and method thereof
JP2007219029A (en) * 2006-02-15 2007-08-30 Sharp Corp Automatic focusing device
CN103364921A (en) * 2012-03-29 2013-10-23 奥林巴斯映像株式会社 Focus adjustment unit and camera system
US10705325B2 (en) 2014-02-24 2020-07-07 Olympus Corporation Focusing method, measuring method, principal point detecting method, focusing device, measuring device, and principal point detecting device

Similar Documents

Publication Publication Date Title
JPS6454408A (en) Automatic focusing method
JPS547078A (en) Automatic positioning method to inherent position of machine in numerical control
ATE87436T1 (en) METHOD AND DEVICE FOR HANDLING CLOTHING BLANKS.
IL128876A0 (en) Solvent and acid resistant membrane on the basis of polyacrylonitrile and a comonomer copolymerized therewith and a method of manufacturing
JPS6478103A (en) Work recognizing method by image processing
JPS6484108A (en) Position detecting method for alignment mark
DE59003119D1 (en) Forage harvester.
JPS6427886A (en) Method of recognizing body
JPS57125849A (en) Blood corpuscle detecting apparatus
JPS565294A (en) Stretcher of mine sweeping device
RO102641B1 (en) Purification method of 2-acrylamido-2-methylpropane-1-sulphonic monomer acid
JPS53140380A (en) Lens dyeing device
JPS56138217A (en) Surface position detecting method
JPS6413686A (en) System for measuring character size in character string
JPS5424546A (en) Pattern recognition method
JPS53130935A (en) Pattern recognition unit
JPS6479882A (en) Image pickup type boundary detector
JPS6450332A (en) Stroke measurement device for power on-off device
JPS5298432A (en) Recognition unit
JPS6488691A (en) Ring form parts recognizing method
JPS6426203A (en) Pid controller
JPS54157431A (en) Shutter for pickup device
JPS6472284A (en) Position recognizing method
JPS5428082A (en) Processing device
JPS6448571A (en) Automatic following camera