GB1526375A - Method of identifying streaks on a web - Google Patents

Method of identifying streaks on a web

Info

Publication number
GB1526375A
GB1526375A GB1290276A GB1290276A GB1526375A GB 1526375 A GB1526375 A GB 1526375A GB 1290276 A GB1290276 A GB 1290276A GB 1290276 A GB1290276 A GB 1290276A GB 1526375 A GB1526375 A GB 1526375A
Authority
GB
United Kingdom
Prior art keywords
web
register
scan
direction
streaks
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.)
Expired
Application number
GB1290276A
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.)
Ciba Geigy AG
Original Assignee
Ciba Geigy AG
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 Ciba Geigy AG filed Critical Ciba Geigy AG
Priority to GB1290276A priority Critical patent/GB1526375A/en
Publication of GB1526375A publication Critical patent/GB1526375A/en
Application status is Expired legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
    • G01N21/84Systems specially adapted for particular applications
    • G01N21/88Investigating the presence of flaws or contamination
    • G01N21/89Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/892Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
    • G01N21/8921Streaks
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00General purpose image data processing
    • G06T1/0007Image acquisition

Abstract

1526375 Detecting streaks on a web CIBAGEIGY AG 23 March 1977 [31 March 1976] 12902/76 Heading G1A A method of identifying streaks on a web comprises creating relative movement in a first direction between the web and an inspection station, scanning the web in a second direction and deriving from the signal thus produced a succession of digital signals each corresponding to a different element of web, feeding each digital signal into a different arithmetic register in a computer, repeating the scan during or after relative movement in the first direction, feeding each digital signal from an element to the corresponding arithmetic register of the earlier scan(s) and, after a predetermined number of scans, making the computer compare the contents of each register and of one or more of the other registers to see if the differences exceed a predetermined amount thereby indicating a streak. A first source of a frequency determined by scan requirements, web speed and resolution controls the scan rate, the digital signals being fed into register 112 and then transferred through register 13 into the arithmetic registers at a rate determined by a second frequency source. The digital signals may be obtained from a combination of the inspection signals with a noise signal.
GB1290276A 1977-03-23 1977-03-23 Method of identifying streaks on a web Expired GB1526375A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1290276A GB1526375A (en) 1977-03-23 1977-03-23 Method of identifying streaks on a web

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1290276A GB1526375A (en) 1977-03-23 1977-03-23 Method of identifying streaks on a web

Publications (1)

Publication Number Publication Date
GB1526375A true GB1526375A (en) 1978-09-27

Family

ID=10013239

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1290276A Expired GB1526375A (en) 1977-03-23 1977-03-23 Method of identifying streaks on a web

Country Status (1)

Country Link
GB (1) GB1526375A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0008010A1 (en) * 1978-08-09 1980-02-20 Westinghouse Electric Corporation Method of detecting flaws on surfaces
EP0008353A1 (en) * 1978-08-09 1980-03-05 Westinghouse Electric Corporation Method of detection and classification of flaws on metallic surfaces
EP0010791A1 (en) * 1978-10-19 1980-05-14 AGFA-GEVAERT naamloze vennootschap Method and device for inspecting a moving sheet material for streaklike defects
EP0030520A1 (en) * 1979-12-07 1981-06-17 Ciba-Geigy Ag Process and device for testing coated supporting-web material so as to determine the presence of pouring streaks

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0008010A1 (en) * 1978-08-09 1980-02-20 Westinghouse Electric Corporation Method of detecting flaws on surfaces
EP0008353A1 (en) * 1978-08-09 1980-03-05 Westinghouse Electric Corporation Method of detection and classification of flaws on metallic surfaces
EP0010791A1 (en) * 1978-10-19 1980-05-14 AGFA-GEVAERT naamloze vennootschap Method and device for inspecting a moving sheet material for streaklike defects
EP0030520A1 (en) * 1979-12-07 1981-06-17 Ciba-Geigy Ag Process and device for testing coated supporting-web material so as to determine the presence of pouring streaks

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee