JPH04338905A - Focus detection device - Google Patents

Focus detection device

Info

Publication number
JPH04338905A
JPH04338905A JP3159377A JP15937791A JPH04338905A JP H04338905 A JPH04338905 A JP H04338905A JP 3159377 A JP3159377 A JP 3159377A JP 15937791 A JP15937791 A JP 15937791A JP H04338905 A JPH04338905 A JP H04338905A
Authority
JP
Japan
Prior art keywords
data
couple
photoelectric
focus detection
correlation
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
JP3159377A
Other languages
Japanese (ja)
Other versions
JPH07119885B2 (en
Inventor
Takeshi Utagawa
Original Assignee
Nikon Corp
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 Nikon Corp filed Critical Nikon Corp
Priority to JP3159377A priority Critical patent/JPH07119885B2/en
Publication of JPH04338905A publication Critical patent/JPH04338905A/en
Publication of JPH07119885B2 publication Critical patent/JPH07119885B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE: To improve the detection accuracy by shifting images alternately to find their correlation quantity, and calculating the relative deviation quantity by interpolating extremal values by assuming that the correlation curve has a V shape.
CONSTITUTION: A couple of pieces of luminous flux having parallax optically are guided onto a couple of photoelectric converting means and the relative shift of the object images on the photoelectric converting means is calculated to perform focus detection. In this case, the photoelectric outputs of the couple of photoelectric converting means or filter outputs obtained by filtering the photoelectric outputs are denoted as data A1, A2 ... or B1, B2..., the couples of data A and B are compared while a specific number of data shift quantities L (L: integer) to calculate plural next correlation quantities by an arithmetic means according to an equation I. In the equation I, (q) is a function of the L. This focus detection device is so constituted that addition by the arithmetic means is performed by shifting both the data in comparison start position alternately by one each time the mutual shift quantity L increases.
COPYRIGHT: (C)1992,JPO&Japio
JP3159377A 1991-07-01 1991-07-01 Focus detection device Expired - Lifetime JPH07119885B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3159377A JPH07119885B2 (en) 1991-07-01 1991-07-01 Focus detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3159377A JPH07119885B2 (en) 1991-07-01 1991-07-01 Focus detection device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP59007725A Division JPH0750241B2 (en) 1984-01-19 1984-01-19 Focus detection device

Publications (2)

Publication Number Publication Date
JPH04338905A true JPH04338905A (en) 1992-11-26
JPH07119885B2 JPH07119885B2 (en) 1995-12-20

Family

ID=15692489

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3159377A Expired - Lifetime JPH07119885B2 (en) 1991-07-01 1991-07-01 Focus detection device

Country Status (1)

Country Link
JP (1) JPH07119885B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009124575A (en) * 2007-11-16 2009-06-04 Nikon Corp Correlation computing method, correlation computing unit, focus detector and imaging apparatus
JP2009124574A (en) * 2007-11-16 2009-06-04 Nikon Corp Correlation computing method, correlation computing unit, focus detector and imaging apparatus
US7586072B2 (en) 2006-11-15 2009-09-08 Nikon Corporation Correlation operation method, correlation operation device, focus detection device and imaging device
US7586588B2 (en) 2006-05-17 2009-09-08 Nikon Corporation Correlation operation method, correlation operation device, focus detection device and imaging device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55124112A (en) * 1979-03-16 1980-09-25 Nippon Kogaku Kk <Nikon> Focusing detector
JPS59126517A (en) * 1983-01-10 1984-07-21 Minolta Camera Co Ltd Focusing detector of camera

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55124112A (en) * 1979-03-16 1980-09-25 Nippon Kogaku Kk <Nikon> Focusing detector
JPS59126517A (en) * 1983-01-10 1984-07-21 Minolta Camera Co Ltd Focusing detector of camera

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7586588B2 (en) 2006-05-17 2009-09-08 Nikon Corporation Correlation operation method, correlation operation device, focus detection device and imaging device
US7586072B2 (en) 2006-11-15 2009-09-08 Nikon Corporation Correlation operation method, correlation operation device, focus detection device and imaging device
JP2009124575A (en) * 2007-11-16 2009-06-04 Nikon Corp Correlation computing method, correlation computing unit, focus detector and imaging apparatus
JP2009124574A (en) * 2007-11-16 2009-06-04 Nikon Corp Correlation computing method, correlation computing unit, focus detector and imaging apparatus

Also Published As

Publication number Publication date
JPH07119885B2 (en) 1995-12-20

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Legal Events

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