CA2083037A1 - Method and apparatus for determining the image clarity of a surface - Google Patents

Method and apparatus for determining the image clarity of a surface

Info

Publication number
CA2083037A1
CA2083037A1 CA2083037A CA2083037A CA2083037A1 CA 2083037 A1 CA2083037 A1 CA 2083037A1 CA 2083037 A CA2083037 A CA 2083037A CA 2083037 A CA2083037 A CA 2083037A CA 2083037 A1 CA2083037 A1 CA 2083037A1
Authority
CA
Canada
Prior art keywords
image
determining
image clarity
clarity
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
CA2083037A
Other languages
French (fr)
Other versions
CA2083037C (en
Inventor
Christiaan Theodorus Wilhelmus Lahaije
Wilhelmus Jacobus Van Der Meer
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.)
Tata Steel Ijmuiden BV
Original Assignee
Christiaan Theodorus Wilhelmus Lahaije
Wilhelmus Jacobus Van Der Meer
Hoogovens Groep Bv
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 Christiaan Theodorus Wilhelmus Lahaije, Wilhelmus Jacobus Van Der Meer, Hoogovens Groep Bv filed Critical Christiaan Theodorus Wilhelmus Lahaije
Publication of CA2083037A1 publication Critical patent/CA2083037A1/en
Application granted granted Critical
Publication of CA2083037C publication Critical patent/CA2083037C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
    • G01B11/303—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces using photoelectric detection means
    • 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
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity
    • G01N21/57—Measuring gloss
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/063—Illuminating optical parts
    • G01N2201/0635—Structured illumination, e.g. with grating

Abstract

Method for determining the image clarity of a surface of a sheet, strip or similar, comprising reflection of an image on the surface, detection of a virtual image of the image projected onto the surface and the processing of the detected virtual image of the image projected onto the surface into a signal that is presented as a measure for the image clarity of the surface, wherein the image reflected onto the surface is composed of a number of distinctive light spots and wherein the number of distinctive light spots is determined from the virtual image detected, which number determines, at least in part, the magnitude of the signal.
CA002083037A 1990-05-18 1991-05-17 Method and apparatus for determining the image clarity of a surface Expired - Fee Related CA2083037C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9001164 1990-05-18
NL9001164A NL9001164A (en) 1990-05-18 1990-05-18 METHOD AND APPARATUS FOR DETERMINING THE IMAGE BRIGHTNESS OF A SURFACE

Publications (2)

Publication Number Publication Date
CA2083037A1 true CA2083037A1 (en) 1991-11-19
CA2083037C CA2083037C (en) 1995-05-30

Family

ID=19857117

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002083037A Expired - Fee Related CA2083037C (en) 1990-05-18 1991-05-17 Method and apparatus for determining the image clarity of a surface

Country Status (9)

Country Link
US (1) US5359668A (en)
EP (1) EP0528915B1 (en)
JP (1) JPH05505677A (en)
AT (1) ATE99802T1 (en)
CA (1) CA2083037C (en)
DE (1) DE69100947T2 (en)
DK (1) DK0528915T3 (en)
NL (1) NL9001164A (en)
WO (1) WO1991018278A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2737294B1 (en) * 1995-07-26 1997-09-05 Satimage METHOD AND DEVICE FOR DETECTING THE SURFACE CONDITION OF WORKPIECES WITH REFLECTIVE SURFACE, APPLICABLE TO THE ROUGH TEST OF POLISHED WORKPIECES
DE19758466B4 (en) * 1997-03-11 2007-10-04 Betriebsforschungsinstitut VDEh - Institut für angewandte Forschung GmbH Flatness control system for metal strip
US20050008198A1 (en) * 2001-09-14 2005-01-13 Guo Chun Biao Apparatus and method for selecting key frames of clear faces through a sequence of images
EP2031348B1 (en) * 2007-07-09 2014-09-10 VDEh-Betriebsforschungsinstitut GmbH Surface inspection method for detecting surface defects and/or charting the surface topography
CN104251687B (en) * 2014-10-11 2017-05-03 盐城工学院 Part surface evenness detection method based on mirror image processing
JP7272124B2 (en) * 2019-06-11 2023-05-12 コニカミノルタ株式会社 Evaluation device and evaluation method

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5271289A (en) * 1975-12-11 1977-06-14 Mitsubishi Electric Corp Surface inspection device
JPS56122906A (en) * 1980-03-01 1981-09-26 Hitachi Maxell Ltd Measuring method for surface flatness of magnetic recording medium
US4863268A (en) * 1984-02-14 1989-09-05 Diffracto Ltd. Diffractosight improvements
US4629319A (en) * 1984-02-14 1986-12-16 Diffracto Ltd. Panel surface flaw inspection
JPS6175236A (en) * 1984-09-20 1986-04-17 Nippon Soken Inc Apparatus for measuring coated surface
JPS6260075A (en) * 1985-09-10 1987-03-16 Hitachi Ltd Shape recognizing device
DE3919893A1 (en) * 1988-06-22 1989-12-28 Innovat Ges Fuer Sondermaschin Method and device for contactless measurement of deformations (distortions) on surfaces
FR2634551B1 (en) * 1988-07-20 1990-11-02 Siderurgie Fse Inst Rech METHOD AND DEVICE FOR IDENTIFYING THE FINISH OF A METAL SURFACE
US4975972A (en) * 1988-10-18 1990-12-04 At&T Bell Laboratories Method and apparatus for surface inspection
WO1990006505A1 (en) * 1988-11-28 1990-06-14 Matsushita Electric Industrial Co., Ltd. Method of and apparatus for detecting wrinkles in tapes
IT1224030B (en) * 1988-12-23 1990-09-26 Fiat Ricerche METHOD AND DEVICE FOR THE SURVEY AND CLASSIFICATION OF THE STRUCTURE OF SURFACE TREATMENTS
US5142648A (en) * 1990-08-02 1992-08-25 General Motors Corporation Method and apparatus for paint inspection
USH999H (en) * 1990-09-13 1991-12-03 The United States Of America As Represented By The Secretary Of The Air Force Transparency distortion measurement process
US5155558A (en) * 1990-09-19 1992-10-13 E. I. Du Pont De Nemours And Company Method and apparatus for analyzing the appearance features of a surface
US5208766A (en) * 1990-11-13 1993-05-04 Hughes Aircraft Company Automated evaluation of painted surface quality

Also Published As

Publication number Publication date
NL9001164A (en) 1991-12-16
EP0528915B1 (en) 1994-01-05
CA2083037C (en) 1995-05-30
WO1991018278A1 (en) 1991-11-28
EP0528915A1 (en) 1993-03-03
DE69100947D1 (en) 1994-02-17
ATE99802T1 (en) 1994-01-15
US5359668A (en) 1994-10-25
JPH05505677A (en) 1993-08-19
DK0528915T3 (en) 1994-05-09
DE69100947T2 (en) 1994-05-05

Similar Documents

Publication Publication Date Title
CA2003131A1 (en) Biological object detection apparatus
CA2108823A1 (en) Image Processing Apparatus and Method Therefor
AU1506200A (en) A method and an apparatus for the simultaneous determination of surface topometry and biometry of the eye
EP0426866A4 (en) Projection/exposure device and projection/exposure method
EP0816800A3 (en) Sheet thickness sensing apparatus
WO1997001111A3 (en) Improved optical ranging camera
EP0526948A3 (en) Method and apparatus for determining the distance between an image and an object.
EP0379226A3 (en) Ranging apparatus
EP0590846A3 (en) Image processor for target detection and tracking.
TW341719B (en) Surface position detecting method and scanning exposure method using the same
CA2002547A1 (en) Sensing the shape of an object
DE69619591D1 (en) Dichotomic scanning system for edge determination of objects with relatively uniform surfaces
CA2202197A1 (en) Method and apparatus for determining a profile of an image displaced a distance from a platen
CA2083037A1 (en) Method and apparatus for determining the image clarity of a surface
EP1710792A3 (en) Servo-balance adjusting technique for optical disk recording
DE69631618D1 (en) Two-line scanning system for the detection of overlapping objects
AU3407393A (en) Improvements in or relating to surface curvature measurement
EP0381426A3 (en) Apparatus for determining the position of a light pen on a display device
EP0306275A3 (en) Photoelectron image projection apparatus
TR28644A (en) Automatic device and method for the detection and determination of air targets.
EP0122961A3 (en) Ocular fundus analyzer
CA2061868A1 (en) Method and device for optical measurement of distances
ATE186123T1 (en) METHOD AND DEVICE FOR EXTRACTING CONNECTION AREAS IN THE B-LIGHT SCREEN IMAGE
IL109418A0 (en) Apparatus for determining the point of incidence in an image
ES2014888A6 (en) Apparatus and method for inspecting glass sheets.

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed