JPS5724808A - Recognizing method for hole - Google Patents

Recognizing method for hole

Info

Publication number
JPS5724808A
JPS5724808A JP9995280A JP9995280A JPS5724808A JP S5724808 A JPS5724808 A JP S5724808A JP 9995280 A JP9995280 A JP 9995280A JP 9995280 A JP9995280 A JP 9995280A JP S5724808 A JPS5724808 A JP S5724808A
Authority
JP
Japan
Prior art keywords
hole
image
picked
converted
video 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.)
Pending
Application number
JP9995280A
Other languages
Japanese (ja)
Inventor
Makoto Ariga
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP9995280A priority Critical patent/JPS5724808A/en
Publication of JPS5724808A publication Critical patent/JPS5724808A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

PURPOSE:To enable a simple and rapid recognition of a position, a shape, etc. of a hole, by a method wherein the image of a hole in an object is picked up in an out- of-focus state by means of an image pickup device, and a video signal is converted into a binary system by means of a prearranged threshould value. CONSTITUTION:An image formation lens 3 is positioned so that a light image of a hole 1a in an object 1 is picked up in an out-of-focus state on a light-receiving surface of an image pickup device 2. Thus, the light image, picked up by means of the image pikup device 2, is prevented from the production of fine noise and is processed on the average as shown in a drawing (a) to be brought into a vangue image. As a result, a video signal 7 outputted is also averaged, and if the video signal is converted into a binary system by means of a prearranged threshould value, only a spot, corresponding to the hole 1a, is converted into a binary system. This permits the simple and rapid recognigtion of shape and position of the hole 1a based on a signal in which a fine noise is erased.
JP9995280A 1980-07-23 1980-07-23 Recognizing method for hole Pending JPS5724808A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9995280A JPS5724808A (en) 1980-07-23 1980-07-23 Recognizing method for hole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9995280A JPS5724808A (en) 1980-07-23 1980-07-23 Recognizing method for hole

Publications (1)

Publication Number Publication Date
JPS5724808A true JPS5724808A (en) 1982-02-09

Family

ID=14261028

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9995280A Pending JPS5724808A (en) 1980-07-23 1980-07-23 Recognizing method for hole

Country Status (1)

Country Link
JP (1) JPS5724808A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6247788A (en) * 1985-08-27 1987-03-02 Shigumatsukusu Kk Object discriminating device
JPS62188952A (en) * 1986-02-14 1987-08-18 Canon Inc Film image information reader

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6247788A (en) * 1985-08-27 1987-03-02 Shigumatsukusu Kk Object discriminating device
JPS62188952A (en) * 1986-02-14 1987-08-18 Canon Inc Film image information reader

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