JPS6472665A - Automatic focusing device - Google Patents

Automatic focusing device

Info

Publication number
JPS6472665A
JPS6472665A JP62228993A JP22899387A JPS6472665A JP S6472665 A JPS6472665 A JP S6472665A JP 62228993 A JP62228993 A JP 62228993A JP 22899387 A JP22899387 A JP 22899387A JP S6472665 A JPS6472665 A JP S6472665A
Authority
JP
Japan
Prior art keywords
information
subject
distance
change
area
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
JP62228993A
Other languages
Japanese (ja)
Other versions
JP2713918B2 (en
Inventor
Kunihiko Yamada
Akihiro Fujiwara
Hiroshi Suda
Masamichi Toyama
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 JP62228993A priority Critical patent/JP2713918B2/en
Priority to GB8820363A priority patent/GB2209446B/en
Priority to DE19883844873 priority patent/DE3844873C2/en
Priority to DE19883844874 priority patent/DE3844874C2/en
Priority to DE3829733A priority patent/DE3829733A1/en
Publication of JPS6472665A publication Critical patent/JPS6472665A/en
Priority to GB9117963A priority patent/GB2247378B/en
Priority to US07/845,768 priority patent/US5164835A/en
Priority to GB9207063A priority patent/GB2251999B/en
Priority to US08/277,701 priority patent/US5422671A/en
Application granted granted Critical
Publication of JP2713918B2 publication Critical patent/JP2713918B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To trace an object with high accuracy and at high probability without fail by operating the position information of an area, where the change of binarizing information is detected, and setting the central position of a distance- measurement area. CONSTITUTION:The titled device is provided with a means to compare a luminance level in plural areas set at the image-pick-up surface of a photographing means 2 with a prescribed value and to obtain the binarizing information, and an arithmetic means 27 to compare the binarizing information in respective areas in a present field and the preceding field before a prescribed period, to detect the change, to operate the position information in the area where the change of the binarizing information is detected, and to set the central position of the distance-measurement area. Thus, the position of the distance- measurement frame can be always traced at the center of the movement of the subject, and when the subject to be aimed moves, the subject can be focused without fail.
JP62228993A 1987-09-02 1987-09-12 Automatic focusing device Expired - Lifetime JP2713918B2 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
JP62228993A JP2713918B2 (en) 1987-09-12 1987-09-12 Automatic focusing device
GB8820363A GB2209446B (en) 1987-09-02 1988-08-26 Automatic focusing device
DE19883844874 DE3844874C2 (en) 1987-09-02 1988-09-01 Automatic focusing device
DE3829733A DE3829733A1 (en) 1987-09-02 1988-09-01 AUTOMATIC FOCUSING DEVICE
DE19883844873 DE3844873C2 (en) 1987-09-02 1988-09-01 Imaging device
GB9117963A GB2247378B (en) 1987-09-02 1991-08-20 Automatic focusing device
US07/845,768 US5164835A (en) 1987-09-02 1992-03-02 Automatic focusing device
GB9207063A GB2251999B (en) 1987-09-02 1992-03-31 Automatic focusing device
US08/277,701 US5422671A (en) 1987-09-02 1994-07-20 Automatic focus control by use of component value differences in an image sensing plane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62228993A JP2713918B2 (en) 1987-09-12 1987-09-12 Automatic focusing device

Publications (2)

Publication Number Publication Date
JPS6472665A true JPS6472665A (en) 1989-03-17
JP2713918B2 JP2713918B2 (en) 1998-02-16

Family

ID=16885083

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62228993A Expired - Lifetime JP2713918B2 (en) 1987-09-02 1987-09-12 Automatic focusing device

Country Status (1)

Country Link
JP (1) JP2713918B2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6277968U (en) * 1985-11-05 1987-05-19

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6277968U (en) * 1985-11-05 1987-05-19

Also Published As

Publication number Publication date
JP2713918B2 (en) 1998-02-16

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term