JPS55124112A - Focusing detector - Google Patents
Focusing detectorInfo
- 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
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
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS545270A (en) * | 1977-06-09 | 1979-01-16 | Lonza Ag | Rotary filter |
-
1979
- 1979-03-16 JP JP3004679A patent/JPS55124112A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS545270A (en) * | 1977-06-09 | 1979-01-16 | Lonza Ag | Rotary filter |
Cited By (6)
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 |
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