JPS55124112A - Focusing detector - Google Patents

Focusing detector

Info

Publication number
JPS55124112A
JPS55124112A JP3004679A JP3004679A JPS55124112A JP S55124112 A JPS55124112 A JP S55124112A JP 3004679 A JP3004679 A JP 3004679A JP 3004679 A JP3004679 A JP 3004679A JP S55124112 A JPS55124112 A JP S55124112A
Authority
JP
Japan
Prior art keywords
circuits
space frequency
signals
information
space
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
JP3004679A
Other languages
Japanese (ja)
Other versions
JPS6236207B2 (en
Inventor
Takeshi Utagawa
Kunihisa Hoshino
Hiroshi Shirasu
Akira Ogasawara
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.)
Nikon Corp
Nippon Chemical Industrial Co Ltd
Original Assignee
Nippon Chemical Industrial Co Ltd
Nippon Kogaku KK
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 Nippon Chemical Industrial Co Ltd, Nippon Kogaku KK filed Critical Nippon Chemical Industrial Co Ltd
Priority to JP3004679A priority Critical patent/JPS55124112A/en
Priority to US06/112,350 priority patent/US4336450A/en
Priority to DE19803001767 priority patent/DE3001767A1/en
Publication of JPS55124112A publication Critical patent/JPS55124112A/en
Publication of JPS6236207B2 publication Critical patent/JPS6236207B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE: To make possible focusing detection of high accuracy by using space frequency component extracting circuits, correlation circuits and standard factor circuits.
CONSTITUTION: Photoelectric element array 5, 6 are combined with space frequency component extracting circuits 7, 8, adders 12, 13, 20, 25, subtractors 14W16, absolute value circuits 17W19, 21W24 and divider 26. As a result of this, the signals V1, V1' containing much of the information on the 1st space frequency components and the signals V2, V2' containing much of the information on the 2nd space frequency components of the space period half thereof are extracted from the outputs f1Wf8, f1'Wf8' of the photoelectric element arrays 5, 6 and at the same time the scalar outputs r0, r0' are formed, and further the specified operations are accomplished, whereby the standardized correlation output T which is the correlation output |V1-V1'|+|V2-V2'|+|r0-r0'| divided by standard factors (r1+r2+ r1'+r2') and hardly depends upon the sharpness of light images, is obtained, and the intended object achieved.
COPYRIGHT: (C)1980,JPO&Japio
JP3004679A 1979-01-20 1979-03-16 Focusing detector Granted JPS55124112A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP3004679A JPS55124112A (en) 1979-03-16 1979-03-16 Focusing detector
US06/112,350 US4336450A (en) 1979-01-20 1980-01-15 Focus detecting apparatus
DE19803001767 DE3001767A1 (en) 1979-01-20 1980-01-18 FOCUS DETECTOR

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3004679A JPS55124112A (en) 1979-03-16 1979-03-16 Focusing detector

Publications (2)

Publication Number Publication Date
JPS55124112A true JPS55124112A (en) 1980-09-25
JPS6236207B2 JPS6236207B2 (en) 1987-08-06

Family

ID=12292872

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3004679A Granted JPS55124112A (en) 1979-01-20 1979-03-16 Focusing detector

Country Status (1)

Country Link
JP (1) JPS55124112A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61209413A (en) * 1986-01-20 1986-09-17 Nippon Kogaku Kk <Nikon> Focus detector
JPH04338905A (en) * 1991-07-01 1992-11-26 Nikon Corp Focus detection device
EP0774730A3 (en) * 1995-11-01 1998-04-01 Canon Kabushiki Kaisha Object extraction method, and image sensing apparatus using the method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS545270A (en) * 1977-06-09 1979-01-16 Lonza Ag Rotary filter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS545270A (en) * 1977-06-09 1979-01-16 Lonza Ag Rotary filter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61209413A (en) * 1986-01-20 1986-09-17 Nippon Kogaku Kk <Nikon> Focus detector
JPS6237364B2 (en) * 1986-01-20 1987-08-12 Nippon Kogaku Kk
JPH04338905A (en) * 1991-07-01 1992-11-26 Nikon Corp Focus detection device
EP0774730A3 (en) * 1995-11-01 1998-04-01 Canon Kabushiki Kaisha Object extraction method, and image sensing apparatus using the method
US6636635B2 (en) 1995-11-01 2003-10-21 Canon Kabushiki Kaisha Object extraction method, and image sensing apparatus using the method
US6993184B2 (en) 1995-11-01 2006-01-31 Canon Kabushiki Kaisha Object extraction method, and image sensing apparatus using the method

Also Published As

Publication number Publication date
JPS6236207B2 (en) 1987-08-06

Similar Documents

Publication Publication Date Title
JPS57161708A (en) Focusing detector having variable visual field of detection
JPS5557809A (en) Focusing detection system
JPS5545031A (en) Focus state detector
JPS5574409A (en) Defect inspection system of repetitive pattern
JPS55124112A (en) Focusing detector
JPS5589819A (en) Focus detector of camera
JPS538159A (en) Color information selection method
JPS5344160A (en) Parallel coding circuit
JPS53141520A (en) Picture scanning read system of semiconductor photo detector
JPS561022A (en) Focus detector of camera
JPS5355179A (en) Seismic wave automatic recorder
JPS54161355A (en) Automatic range finder
JPS53124018A (en) Signal detector circuit for video disc player
JPS5322310A (en) Picture read system
JPS5428144A (en) Recorder
JPS56137341A (en) Method for detecting out-of-focus image
JPS567002A (en) Distance detecting system
JPS53136829A (en) Focus detector
JPS5390724A (en) Recording system for information recording substance
JPS53105181A (en) Semiconductor radiant-ray detector
JPS55114031A (en) Detector for pulse absence
JPS5698795A (en) High-speed sample holding and comparing circuit
Deigan The mechanics of color microdensitometry for digital image processing
JPS5663673A (en) Slice level generation system
JPS5588462A (en) Scanning timing detector