JPS5664323A - Focusing detecting method - Google Patents

Focusing detecting method

Info

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
Application number
JP13970379A
Other languages
Japanese (ja)
Inventor
Takeomi Suzuki
Masahiro Aoki
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.)
Olympus Corp
Original Assignee
Olympus Optical Co Ltd
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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP13970379A priority Critical patent/JPS5664323A/en
Publication of JPS5664323A publication Critical patent/JPS5664323A/en
Pending legal-status Critical Current

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
JP13970379A 1979-10-29 1979-10-29 Focusing detecting method Pending JPS5664323A (en)

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)

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