JPS5474793A - Surface defect inspection method of steel plates - Google Patents

Surface defect inspection method of steel plates

Info

Publication number
JPS5474793A
JPS5474793A JP14251677A JP14251677A JPS5474793A JP S5474793 A JPS5474793 A JP S5474793A JP 14251677 A JP14251677 A JP 14251677A JP 14251677 A JP14251677 A JP 14251677A JP S5474793 A JPS5474793 A JP S5474793A
Authority
JP
Japan
Prior art keywords
signal processing
processing part
defect
area
steel plates
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
JP14251677A
Other languages
Japanese (ja)
Other versions
JPS6142222B2 (en
Inventor
Kenichi Sakamoto
Takeshi Katayama
Tadao Kawaguchi
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP14251677A priority Critical patent/JPS5474793A/en
Publication of JPS5474793A publication Critical patent/JPS5474793A/en
Publication of JPS6142222B2 publication Critical patent/JPS6142222B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

PURPOSE:To discriminate the kinds of defects by obtaining parameters indicating the directivity of surface defects and parameters indicating the sharpness of the surface defects in the longitudinal and transverse directions. CONSTITUTION:A defect image is formed in an image pickup part 5 by an optical system 4 and is converted to an electric signal, which is then sent to a signal processing part 6. In the signal processing part 6, it undergoes necessary preprocessing such as mean value, trend removal, etc. for the defect image information, after which two-dimensional frequency analysis processing and the area and length calculation processing of the defect are parallel accomplished. The outputs 13 of the signal processing part 6 are the four parameters based on the two dimensinoal frequency component distribution pattern and the three parameters based on the area and length calculation techniques.
JP14251677A 1977-11-28 1977-11-28 Surface defect inspection method of steel plates Granted JPS5474793A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14251677A JPS5474793A (en) 1977-11-28 1977-11-28 Surface defect inspection method of steel plates

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14251677A JPS5474793A (en) 1977-11-28 1977-11-28 Surface defect inspection method of steel plates

Publications (2)

Publication Number Publication Date
JPS5474793A true JPS5474793A (en) 1979-06-15
JPS6142222B2 JPS6142222B2 (en) 1986-09-19

Family

ID=15317164

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14251677A Granted JPS5474793A (en) 1977-11-28 1977-11-28 Surface defect inspection method of steel plates

Country Status (1)

Country Link
JP (1) JPS5474793A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60253807A (en) * 1984-02-10 1985-12-14 アンスチチュ　ドゥ　ルシェルシュ　ドゥ　ラ　シデルルジー　フランセーズ　（イルシッド） Method and device for detecting surface defect of strip in progress

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62168217U (en) * 1986-04-16 1987-10-26
JPH0511936Y2 (en) * 1987-03-24 1993-03-25

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60253807A (en) * 1984-02-10 1985-12-14 アンスチチュ　ドゥ　ルシェルシュ　ドゥ　ラ　シデルルジー　フランセーズ　（イルシッド） Method and device for detecting surface defect of strip in progress

Also Published As

Publication number Publication date
JPS6142222B2 (en) 1986-09-19

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