WO2004034041B1 - Method and apparatus for the optical evaluation of a paper surface - Google Patents

Method and apparatus for the optical evaluation of a paper surface

Info

Publication number
WO2004034041B1
WO2004034041B1 PCT/PT2003/000014 PT0300014W WO2004034041B1 WO 2004034041 B1 WO2004034041 B1 WO 2004034041B1 PT 0300014 W PT0300014 W PT 0300014W WO 2004034041 B1 WO2004034041 B1 WO 2004034041B1
Authority
WO
WIPO (PCT)
Prior art keywords
paper
illumination
image
defects
equipment
Prior art date
Application number
PCT/PT2003/000014
Other languages
French (fr)
Other versions
WO2004034041A1 (en
Inventor
Nuno Jose Reis Gomes Oliveira
Original Assignee
Soporcel Sociedade Portuguesa
Nuno Jose Reis Gomes Oliveira
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 Soporcel Sociedade Portuguesa, Nuno Jose Reis Gomes Oliveira filed Critical Soporcel Sociedade Portuguesa
Priority to AU2003267886A priority Critical patent/AU2003267886A1/en
Publication of WO2004034041A1 publication Critical patent/WO2004034041A1/en
Publication of WO2004034041B1 publication Critical patent/WO2004034041B1/en
Priority to SE0500761A priority patent/SE528526C2/en
Priority to FI20050383A priority patent/FI121033B/en

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
    • G01N21/8901—Optical details; Scanning details
    • G01N21/8903—Optical details; Scanning details using a multiple detector array
    • 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
    • G01N21/84—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
    • G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
    • G01N2021/8917—Paper, also ondulated

Landscapes

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

Abstract

The present invention relates to a method and automated equipment for the optical evaluation of smoothness defects, namely surface defects, starch application flaws and water-line defects, of the surface of the paper obtained in a paper production plant, which comprises a system (1) for the transportation and positioning of the paper in a planar table, a system (2) for the illumination and imaging, a computer based control system (3) for the control of the positioning of the paper in the transportation system and finally a system (4) for the analysis and processing of the obtained image. Image processing is performed through low-pass filtering, including through the use of Fourier or East Fourier (FFT) transforms. The image signal of defects is enhanced by averaging pixels along the machine direction (MD).

Claims

11
AMENDED CLAIMS
[Received by the International Bureau on 16 APR 2004 (16.04.04) ; original claims 1 -10, replaced by claims 1-8] A method for the optical evaluation of paper surface defects, using an equipment comprising a system (2) of illumination and image acquisition and a system (4) of analysis and processing of the obtained image, characterized in that:
a) system (2) of illumination and image acquisition uses an illumination (5) with a grazing angle to the surface of the paper in analysis, provided with a small opening light beam, and a digital camera (β) with an optical axis perpendicular to the surface of the paper, b) system (4) of image analysis and processing performs: • simple FFT-based digital filtering in order to eliminate the part of the calculated spectrum that consists typically of low frequency components, such as lack of homogeneity of the illumination, and the structures with preferential orientation parallel to the illumination direction,
• optical measurement of the roughness index defined as the standard deviation of the filtered image's grey level distribution.
A method according to claim 1 characterized in that the system (2) of illumination and image acquisition uses a grazing angle illumination (5) perpendicular to the machine direction for the detection of structures essentially parallel to the machine direction.
A method according to claim 1, characterized in that the system (2) of illumination and image acquisition uses a grazing angle illumination (5) parallel to the machine 12 direction for the detection of structures essentially" perpendicular to the machine direction.
A method for the optical evaluation of water-lines (glossy streaks in the paper surface) on the paper surface, using an equipment comprising a system (2) of illumination and image acquisition and a system (4) of analysis and processing of the obtained image, characterized in that:
a) system (2) of illumination and image acquisition uses an illumination of an adjustable small opening light beam
(10), with incidence in the plane of the paper and the digital camera (11) is placed in a (adjustable) position approximately symmetrical to the lamp (10) in relation to an axis perpendicular to the paper surface,
b) system (4) of analysis and processing of image performs the following steps, according to Figure 8: • Acquisition of the image,
• Reduction to one dimension, line along the CD direction, of the obtained image, by means of calculation of the average of the MD values in each CD position, • Filtration of the one-dimensional image,
• Measurement of the water-lines index defined as the standard deviation of the grey levels of the filtered image (line) ,
• Recording the calculated index and CD position.
An equipment for the automatic and integrated optical evaluation of the «smoothness» defects, according to the methods described in claims 1 to 4, characterized in that 13 j it comprises a system (1) of transport and positioning of the paper on a plane table (7), a system (2) of illumination and image acquisition, a computer based control system (3) for the control of the position of the paper in the transport system and finally a system (4) of analysis and processing of the obtained image, that performs the following steps:
• Loading the paper sample in the equipment's system (1) for paper transport, • Transport of paper in order to place the first for position CD analysis under the digital cameras (β, 11),
• Application of the topography measurement algorithm according to claim 4 for each direction of incidence of the illumination, and water-lines measurement according to claim 8,
• Transport of the paper to the next position of measurement and return to the previous point repeating the cycle until de paper sample is completely unwound.
6. The equipment for the automatic and integrated optical evaluation of the «smoothness» defects according to claim 5, characterized in that the system (1) of transport and positioning of the paper on a flat table (7) comprises an unwinder of the paper that allows to unwind a sample corresponding to the width of a paper reel (8, 12) in order to be available on the plane table (7) an area (13) of the paper to be analysed whose distance to the end of the paper reel (12) is controlled.
7. The equipment for the automatic and integrated optical evaluation of the «smoothness» defects according to claim 5, characterized in that the system (2) of illumination and image acquisition comprises a light source (5, 9, 10) 14 and a digital camera (6, 11), and also in that the orientation of the light and of the camera in relation to the plane of the paper, as well as the light spectrum and beam opening, can be chosen as a function of the defect" to be detected.
The equipment for the automatic and integrated optical evaluation of the «smoothness» defects according to claim 5, characterized in that the computer based control system (3) for the positioning of the paper in the transport system, is totally automatic, therefore without the need of any human intervention for its operation after loading the paper sample.
The use of the equipment for the automatic and integrated optical evaluation of «smoothness» defects according to claims 5 to 8, characterized in that it is applied namely to the optical evaluation of:
a. topography defects of the streak type, b. water-lines defects.
PCT/PT2003/000014 2002-10-08 2003-10-08 Method and apparatus for the optical evaluation of a paper surface WO2004034041A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2003267886A AU2003267886A1 (en) 2002-10-08 2003-10-08 Method and apparatus for the optical evaluation of a paper surface
SE0500761A SE528526C2 (en) 2002-10-08 2005-04-07 Method and apparatus for optical evaluation of a paper surface
FI20050383A FI121033B (en) 2002-10-08 2005-04-14 Method and devices for optical evaluation of paper surface

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PT102849A PT102849B (en) 2002-10-08 2002-10-08 AUTOMATIC METHOD AND INSTALLATION OF OPTICAL ASSESSMENT OF THE ASPECT OF THE PAPER SURFACE
PT102849 2002-10-08

Publications (2)

Publication Number Publication Date
WO2004034041A1 WO2004034041A1 (en) 2004-04-22
WO2004034041B1 true WO2004034041B1 (en) 2004-05-27

Family

ID=32090079

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/PT2003/000014 WO2004034041A1 (en) 2002-10-08 2003-10-08 Method and apparatus for the optical evaluation of a paper surface

Country Status (5)

Country Link
AU (1) AU2003267886A1 (en)
FI (1) FI121033B (en)
PT (1) PT102849B (en)
SE (1) SE528526C2 (en)
WO (1) WO2004034041A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004061951B4 (en) * 2004-12-23 2017-10-12 manroland sheetfed GmbH Quality control procedure for surface variable printed matter
EP1898207A1 (en) * 2006-09-06 2008-03-12 ABB Oy Method and apparatus for measuring intensity of laid lines in a strip-like product
US8174690B2 (en) 2007-05-11 2012-05-08 Argos Solutions As Apparatus for characterizing a surface structure
DE102007036432A1 (en) * 2007-08-02 2009-02-05 Voith Patent Gmbh Method and device for detecting structures in a fibrous web or in a pulp suspension jet
CN104458750A (en) * 2013-09-25 2015-03-25 中国科学院沈阳自动化研究所 Automatic aluminum profile surface defect detecting equipment based on machine vision
CN103672589A (en) * 2013-10-14 2014-03-26 中科院成都信息技术股份有限公司 Image detection lighting equipment
CN105651783A (en) * 2016-01-08 2016-06-08 深圳控石智能系统有限公司 Dynamic picture detection machine tool and using method thereof
CN117387473B (en) * 2023-12-12 2024-02-23 维达纸业（中国）有限公司 Full-automatic intelligent smoothness measuring device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4222064A (en) * 1977-03-07 1980-09-09 Nekoosa Papers Inc. Optical property measurement system and method
US5068799A (en) * 1985-04-24 1991-11-26 Jarrett Jr Harold M System and method for detecting flaws in continuous web materials
FR2631112B1 (en) * 1988-05-04 1992-11-27 Cattarino Yvan METHOD AND DEVICE FOR AUTOMATICALLY DETECTING, VISUALIZING AND MEASURING THE POSITION OF THE WATER LINE OF A PAPER MACHINE
JPH10267636A (en) * 1997-03-28 1998-10-09 New Kurieishiyon:Kk Method and apparatus for surface inspection
FI991071A0 (en) * 1999-05-10 1999-05-10 Valmet Automation Inc Procedure and measurement arrangement for measuring paper surface
SE0003904L (en) * 2000-05-05 2001-11-06 Roger Tuomas Ways of measuring surface roughness

Also Published As

Publication number Publication date
PT102849B (en) 2005-02-28
PT102849A (en) 2004-04-30
FI20050383A (en) 2005-04-14
FI121033B (en) 2010-06-15
AU2003267886A1 (en) 2004-05-04
WO2004034041A1 (en) 2004-04-22
SE528526C2 (en) 2006-12-05
SE0500761L (en) 2005-05-12

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