JPS5664323A - Focusing detecting method - Google Patents
Focusing detecting methodInfo
- Publication number
- JPS5664323A JPS5664323A JP13970379A JP13970379A JPS5664323A JP S5664323 A JPS5664323 A JP S5664323A JP 13970379 A JP13970379 A JP 13970379A JP 13970379 A JP13970379 A JP 13970379A JP S5664323 A JPS5664323 A JP S5664323A
- Authority
- JP
- Japan
- Prior art keywords
- evaluation function
- signals
- function values
- boundary
- threshold value
- 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
Links
Landscapes
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
Abstract
PURPOSE: To make focusing detection accurate and rapid by evalulating the sharpness of an image by means of the evaluation function values which are optimum respectively when an imaging lens is near the focal position and when it largely defocuses, with the threshold value as a boundary.
CONSTITUTION: Light from a subject passes through a taking lens 2 for imaging and part thereof transmits through the translucent mirror part 1a of a movable reflection mirror 1 and is projected to photodetector arrays 8, 9. The respective photodetectors of the photodetector arrays 8, 9 generate the photoelectric conversion signals as analog illuminance signals based on the quantities of the light received therein, respectively. Said signals are converted to digital illuminance signals by a signal processing circuit 14, and are inputted to a central processing unit 15, by which the evaluation function values for fine adjustment and rough adjustment are operated. With the preset threshold value as a boundary, the evaluation function values for rough adjustment and fine adjustment are properly used to enable contrast to be correctly evaluated at all times. In this way, the focusing detection may be accomplished accurately and rapidly.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13970379A JPS5664323A (en) | 1979-10-29 | 1979-10-29 | Focusing detecting method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13970379A JPS5664323A (en) | 1979-10-29 | 1979-10-29 | Focusing detecting method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5664323A true JPS5664323A (en) | 1981-06-01 |
Family
ID=15251444
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13970379A Pending JPS5664323A (en) | 1979-10-29 | 1979-10-29 | Focusing detecting method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5664323A (en) |
-
1979
- 1979-10-29 JP JP13970379A patent/JPS5664323A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5451556A (en) | Distance measuring apparatus | |
JPS53116852A (en) | Automatic focus adjusting system | |
JPS56101111A (en) | Automatic focus adjustment method | |
JPS57158820A (en) | Method for focusing detection | |
JPS57161839A (en) | Distance measuring device of camera | |
JPS5295221A (en) | Detector for focusing | |
JPS5598709A (en) | Focusing detector | |
JPS5697325A (en) | Focus detecting method of camera | |
JPS5529878A (en) | Focus detector of camera | |
EP0280256A3 (en) | Focus detection apparatus for camera | |
JPS55111927A (en) | Automatic focus detector | |
JPS5664323A (en) | Focusing detecting method | |
JPS5629112A (en) | Distance measurement unit | |
JPS5665121A (en) | Distance measuring and photometric device of camera | |
JPS55110231A (en) | Automatic focus indicator of camera | |
JPS55106421A (en) | Focusing detector | |
JPS5541432A (en) | Focus detector | |
JPS5654418A (en) | Focusing detection system | |
JPS5629110A (en) | Distance measurement unit | |
JPS5669606A (en) | Focus detector | |
JPS535649A (en) | Automatic focusing device | |
JPS56153307A (en) | Focusing detecting method | |
JPS5553304A (en) | Focus detector | |
JPS55101003A (en) | Distance detector | |
JPS57182112A (en) | Range detector |