JPS562518A - Signal processing method of mtf measuring instrument - Google Patents

Signal processing method of mtf measuring instrument

Info

Publication number
JPS562518A
JPS562518A JP7857379A JP7857379A JPS562518A JP S562518 A JPS562518 A JP S562518A JP 7857379 A JP7857379 A JP 7857379A JP 7857379 A JP7857379 A JP 7857379A JP S562518 A JPS562518 A JP S562518A
Authority
JP
Japan
Prior art keywords
level
signals
region
processing method
signal
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
JP7857379A
Other languages
Japanese (ja)
Other versions
JPS6360335B2 (en
Inventor
Yoshio Fukushima
Yoshiaki Kamimoto
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP7857379A priority Critical patent/JPS562518A/en
Publication of JPS562518A publication Critical patent/JPS562518A/en
Publication of JPS6360335B2 publication Critical patent/JPS6360335B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/0292—Testing optical properties of objectives by measuring the optical modulation transfer function

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

PURPOSE:To make it possible for a signal processing method to adapt itself for a random space frequency automatically while performing MTF calculation by lowering the possibility that an abnormal signal is picked up as much as possible, by detecting the center signals or closest signals of white and black level regions, one by one. CONSTITUTION:A time series of signals from CCD13 is classified by fixed level Vth into white-level and black-level regions. The number of signals of each region is counted by binary counter 33. Then, the center signal or closest signal of each region is detected, one by one, to obtain the maximum value of the white-level region and the minimum value of the black-level region. Consequently, the possibility that an abnormal signal is picked up can be lowered greatly for correct MTF calculation and the signal processing method can automatically adapt itself at a random space frequency for a chart including continuously a frequency range from a low space frequency at one end to a high space frequency at the other end.
JP7857379A 1979-06-21 1979-06-21 Signal processing method of mtf measuring instrument Granted JPS562518A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7857379A JPS562518A (en) 1979-06-21 1979-06-21 Signal processing method of mtf measuring instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7857379A JPS562518A (en) 1979-06-21 1979-06-21 Signal processing method of mtf measuring instrument

Publications (2)

Publication Number Publication Date
JPS562518A true JPS562518A (en) 1981-01-12
JPS6360335B2 JPS6360335B2 (en) 1988-11-24

Family

ID=13665634

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7857379A Granted JPS562518A (en) 1979-06-21 1979-06-21 Signal processing method of mtf measuring instrument

Country Status (1)

Country Link
JP (1) JPS562518A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5890143A (en) * 1981-11-25 1983-05-28 Ricoh Co Ltd Video signal amplification circuit
JPS5962536U (en) * 1982-10-19 1984-04-24 株式会社リコー Video signal reading control device for MTF measuring machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5890143A (en) * 1981-11-25 1983-05-28 Ricoh Co Ltd Video signal amplification circuit
JPS5962536U (en) * 1982-10-19 1984-04-24 株式会社リコー Video signal reading control device for MTF measuring machine

Also Published As

Publication number Publication date
JPS6360335B2 (en) 1988-11-24

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