WO2002068900A2 - Cible sans marque - Google Patents

Cible sans marque Download PDF

Info

Publication number
WO2002068900A2
WO2002068900A2 PCT/US2002/006400 US0206400W WO02068900A2 WO 2002068900 A2 WO2002068900 A2 WO 2002068900A2 US 0206400 W US0206400 W US 0206400W WO 02068900 A2 WO02068900 A2 WO 02068900A2
Authority
WO
WIPO (PCT)
Prior art keywords
information
trigger
markless
encoder
form hole
Prior art date
Application number
PCT/US2002/006400
Other languages
English (en)
Other versions
WO2002068900A3 (fr
Inventor
Mohanan Unni
German Linares
Original Assignee
Formscan Inc.
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 Formscan Inc. filed Critical Formscan Inc.
Priority to AU2002248520A priority Critical patent/AU2002248520A1/en
Publication of WO2002068900A2 publication Critical patent/WO2002068900A2/fr
Publication of WO2002068900A3 publication Critical patent/WO2002068900A3/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
    • G01D5/2454—Encoders incorporating incremental and absolute signals
    • G01D5/2455—Encoders incorporating incremental and absolute signals with incremental and absolute tracks on the same encoder
    • G01D5/2457—Incremental encoders having reference marks

Definitions

  • the invention relates to a machine vision position indicator, and more particularly relates to a method and apparatus for locating and tracking the relative position of continuous streams of paper sheets without use of markings on the paper.
  • Machine vision relates to an automated examination of an item or image to determine certain characteristics. Machine vision technology is often found in manufacturing plants to check the position, arrangement, quality, and status of objects.
  • Machine vision, or computerized vision, systems are useful in the printing, mailing, and finishing industries.
  • the systems can be Windows NT® based, and utilize digital cameras and/or scanners to read specific information from the objects, such as documents, during the printing or finishing process to ensure that the documents are printed, collated, matched, and mailed correctly.
  • the desire for no marks can stem from, e.g., aesthetic reasons (if a machine vision mark on an object would be aesthetically undesirable), from functional reasons (the mark will hinder or prevent proper performance of the object), or from implementation issues (the surface of the object is not suitable for maintaining a mark, the mark is not reliably consistent).
  • a markless trigger system has a transmissive sensor suitable for detecting holes in a sheet of paper, however the sensor can be of any number of types, including reflective, magnetic, and the like.
  • a quadrature detector is in communication with the encoder, and a counter is provided for tracking paper position.
  • a markless trigger system includes a transmissive sensor suitable for detecting holes in an object.
  • An encoder suitable for generating position and velocity information of the object is further provided.
  • a quadrature detector is provided in communication with the encoder.
  • the object is a sheet of paper.
  • the transmissive sensor is a reflective sensor and/or a magnetic sensor.
  • the encoder combines information from the transmissive sensor and the position and velocity information.
  • the quadrature detector receives information from the counter relating to the object position.
  • the counter is a 16- bit counter mechanism.
  • the markless trigger system can further include an image capture mechanism for viewing the object.
  • a method of generating a markless trigger includes receiving encoder direction and pulse information at a counter, the encoder direction and pulse information relating to a position of an object.
  • Object length information is received at the counter.
  • Top-of-form hole detection is activated upon comparison of the encoder direction and pulse information and the object length information. A determination is made as to whether a top-of-form hole is detected. If a top-of-form hole is detected, the markless trigger is inserted based on the top-of-form hole detection. If a top-of-form hole is not detected, an artificial markless trigger is inserted.
  • position of the object information and velocity of the object information enter a quadrature detector.
  • the quadrature detector can emit the direction and pulse information.
  • the counter tracks the position of the object.
  • the step of determining includes processing encoder direction information, encoder pulse information, hole space counter information, and hole search space register information to determine a manner by which the markless trigger should be inserted.
  • the method further includes the system pausing as a full length of the object passes.
  • the system looks for a next top-of-form hole.
  • the system then generates another markless trigger at the next top-of-form hole, the markelss trigger being based on the detection of another top-of-form hole.
  • the system looks one object length later for a third top-of-form whole.
  • a method of generating a markless trigger includes receiving encoder direction and pulse information at a counter, the encoder direction and pulse information relating to a position of an object.
  • Object length information is received at the counter.
  • Top-of-form hole detection is activated upon comparison of the encoder direction and pulse information and the object length information. A determination is made as to whether a top-of-form hole is detected. If a top-of-form hole is detected, the markless trigger is inserted based on the top-of-form hole detection. If no top-of-form hole is detected, an artificial markless trigger is inserted.
  • FIG. 1 is a diagrammatic illustration of a machine vision system according to one aspect of the present invention
  • FIG. 2 is a block diagram of a quadrature detector according to one aspect of the present invention
  • FIG. 3 is a block diagram of a markless trigger system according to one aspect of the present invention
  • FIG. 4 is a flowchart showing an example determination of a markless trigger according to one aspect of the present invention
  • FIG. 5 is a flowchart showing a further example determination following the process of FIG. 4 according to one aspect of the present invention.
  • the present invention generally relates to a markless trigger machine vision system.
  • the markless trigger system generates a top-of-form signal in a web-based paper process where a conventional trigger mark is not reliably or consistently available.
  • the markless trigger system uses the top-of-form signal in conjunction with an encoder to synchronize and clock the print inspection hardware.
  • a quadrature detector processes signals from an encoder, which provides paper position and velocity.
  • Top-of-form holes provide a trigger enable signal. Once there is a first trigger, the system pauses as the entire length of a sheet of paper passes before the system again looks for the next top-of- form hole. The encoder counts the page lengths. Once the page-length passes, the system looks for the next top-of-form hole.
  • FIGS. 1 through 5 illustrate an example embodiment of a markless trigger system according to the present invention.
  • FIGS. 1 through 5 illustrate an example embodiment of a markless trigger system according to the present invention.
  • FIG. 1 illustrates a basic machine vision system 10.
  • an image capture device 12 looks at an object paper sheet 14 containing one or more images 15.
  • Image capture device 12 can respond within the visual spectrum, e.g., a video or digital camera or scanner, it can also respond to emissions in other spectra, such as infrared, gamma ray, and the like.
  • the object can be a paper sheet 14, as in the illustrated embodiment, or can be any object being processed, manufactured, conveyed, and the like, that requires some form of visual quantification.
  • the paper sheet 14 passes by the area observed by the image capture device 12, while a transmissive sensor 16 searches for a top-of-form hole 17 at a predetermined location along a side perforation of the paper sheet 14.
  • the transmissive sensor 16 communicates the sighting of a top-of-form hole 17 to an encoder 18 which combines the transmissive sensor 16 information with position and velocity information from the paper sheet 14 and transmits everything to a central processing unit 22 containing a quadrature detector 20.
  • the transmissive sensor 16 can utilize a number of different sensing technologies, including but not limited to a reflective or magnetic sensor as understood by one of ordinary skill in the art.
  • the quadrature detector 20 also receives input from a 16-bit counter 24 that tracks the amount of paper sheet 14 passing by the counter 24.
  • the quadrature detector 20 takes the information of a trigger, (the sighting of a top-of-form hole 17 from the transmissive sensor 16) with the position and velocity information from the encoder 18, and the amount of paper sheet 14 passing by the counter 24 to anticipate where and when the next top-of-form hole 17 is to occur.
  • the central processing unit 22 instructs the image capture device 12 to scan for another top-of-form hole 17.
  • the machine vision system 10 insets an artificial trigger to compensate for the missing top- of-form hole 17. Whenever an artificial trigger is inserted, the next trigger is adjusted to compensate for positional errors. The subsequent triggers are then expected to originate from the transmissive sensor 16.
  • FIG. 2 illustrates a block diagram of the quadrature detector 20.
  • the two phases of the encoder 18 enter the quadrature detector 20.
  • the quadrature detector 20 then emits a pulse 32 corresponding to the velocity of the paper sheet 14 (see FIG. 1) and a travel direction indication 34 of the paper sheet 14.
  • the 16-bit counter 24 (see FIG. 1) then tracks the position of the paper sheet 14 based on the pulses from the quadrature detector 20 so that the system 10 can implement artificial triggers as previously described.
  • FIG. 3 illustrates a block diagram of the process the markless trigger system 10 goes through in generating a markless trigger.
  • the encoder direction indication 34 and the encoder pulses 32 are supplied to the 16-bit counter 24, which feeds to a 16-bit comparator 36.
  • the top-of-form hole 17 detection is in communication with the image capture device 12, which controls activation of the top-of-form hole 17.
  • the system 10 can insert a trigger based either on a real detection of a top-of-form hole 17 or on a collection of information indicating the requirement for an artificial trigger insertion.
  • the information includes the encoder direction 34 and pulses 32, data from a hole space counter 39, and a hole search space register 40.
  • FIG. 4 illustrates a flowchart of one example process the markless trigger system
  • the encoder direction indication 34 and the encoder pulses 32 enter the 16-bit counter 24 (step 100), which feeds to a 16-bit comparator 36 (step 102).
  • Page length register 38 information also feeds into the comparator 36 (step 104).
  • the system 10 activates the top-of-form hole 17 detection through use of the image capture device 12 (step 106).
  • the system 10 determines whether to insert a trigger based either on a real detection of a top-of-form hole 17 or on a collection of information indicating the requirement for an artificial trigger insertion (step 108).
  • the system 10 inserts a trigger based on the real detection (step 110). If there is an indication that an artificial trigger insertion is required, the system 10 inserts a trigger based on the supplied information (step 112).
  • the information includes the encoder direction 34 and pulses 32, data from a hole space counter 39, and a hole search space register 40.
  • FIG. 5 is a flowchart showing a continuation process from the step 110 based on real detection of the top-of-form hole 17 of FIG. 4.
  • the markless trigger system 10 pauses as the entire length of the paper sheet 14 passes (step 114) before the system 10 again looks for the next top-of-form hole 17.
  • the counter 24 counts the page lengths (step 116). Once one page-length passes, the system 10 looks for the next top-of-form hole 17 (step 118). The system 10 then determines whether the next top-of-form hole is detected (step 120).
  • the system 10 If the next top of form hole 17 is detected, the system 10 generates another markless trigger at the next top-of-form hole 17 (step 122). If the system 10 does not detect another top-of-form hole 17, the system 10 generates an artificial markless trigger (step 124). The system then automatically looks one page length later for the next top-of-form 17 hole (step 126), adjusted for position errors.
  • the present invention generally relates to a markless trigger machine vision system.
  • the markless trigger system generates a top-of-form signal in a process where a conventional trigger mark is not reliably or consistently available.
  • the markless trigger system uses the top-of-form signal in conjunction with an encoder to synchronize and clock the print inspection hardware.
  • a quadrature detector processes signals from an encoder, which provides paper position and velocity. Top-of-form holes provide a trigger enable signal. Once there is a first trigger, the system pauses as the entire length of a sheet of paper passes before the system again looks for the next top-of-form hole.
  • the encoder counts the page lengths. Once the page-length passes, the system looks for the next top-of-form hole. The system then generates another trigger at the next top-of- form hole. If the system does not detect another top-of-form hole, the system generates an artificial trigger. The system then automatically looks one page length later for the next top-of-form whole, adjusted for position errors.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Controlling Sheets Or Webs (AREA)

Abstract

L'invention concerne un procédé et un appareil permettant d'insérer une cible sans marque dans un objet en cours de fabrication, de traitement, de transport, ou autre. Ce système de cible sans marque comprend un capteur de transmission adapté pour détecter des trous dans une feuille de papier. Ce système comprend également un codeur adapté pour générer des informations de position et de vitesse de la feuille de papier. Un détecteur en quadrature est en communication avec le codeur, et un compteur est destiné à assurer le suivi de la position du papier. Le procédé de l'invention consiste à recevoir des informations de direction et d'impulsion du codeur dans un compteur, ces informations de position et d'impulsion du codeur étant associées à la position d'un objet. Des informations sur la longueur de l'objet sont reçues par le compteur. La détection de trous en haut de la feuille est activée par la comparaison des informations de direction et d'impulsion du codeur et des informations sur la longueur de l'objet. On détermine alors si un trou est détecté en haut de la feuille. Si un trou est détecté en haut de la feuille, la cible sans marque est insérée en fonction de cette détection. Si aucun trou n'est détecté en haut de la feuille, une cible sans marque artificielle est insérée. Le système recherche alors le prochain emplacement où réaliser la détection d'un trou situé en haut d'une feuille.
PCT/US2002/006400 2001-02-28 2002-02-28 Cible sans marque WO2002068900A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002248520A AU2002248520A1 (en) 2001-02-28 2002-02-28 Markless trigger

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US27235101P 2001-02-28 2001-02-28
US60/272,351 2001-02-28

Publications (2)

Publication Number Publication Date
WO2002068900A2 true WO2002068900A2 (fr) 2002-09-06
WO2002068900A3 WO2002068900A3 (fr) 2002-10-24

Family

ID=23039422

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/006400 WO2002068900A2 (fr) 2001-02-28 2002-02-28 Cible sans marque

Country Status (2)

Country Link
AU (1) AU2002248520A1 (fr)
WO (1) WO2002068900A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8238639B2 (en) 2008-04-09 2012-08-07 Cognex Corporation Method and system for dynamic feature detection
US9079426B2 (en) 2010-06-24 2015-07-14 Hewlett-Packard Development Company, L.P. Duplexing web press with drying time control
WO2017075448A1 (fr) * 2015-10-28 2017-05-04 Analog Devices Global Commande d'onduleur de puissance

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5682039A (en) * 1995-05-15 1997-10-28 Calcomp Inc. Media position sensing system having a plurality of apertures in the media edge margin
US6255665B1 (en) * 1999-01-29 2001-07-03 Hewlett-Packard Company Print media and method of detecting a characteristic of a substrate of print media used in a printing device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5682039A (en) * 1995-05-15 1997-10-28 Calcomp Inc. Media position sensing system having a plurality of apertures in the media edge margin
US6255665B1 (en) * 1999-01-29 2001-07-03 Hewlett-Packard Company Print media and method of detecting a characteristic of a substrate of print media used in a printing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8238639B2 (en) 2008-04-09 2012-08-07 Cognex Corporation Method and system for dynamic feature detection
US8411929B2 (en) 2008-04-09 2013-04-02 Cognex Corporation Method and system for dynamic feature detection
US9079426B2 (en) 2010-06-24 2015-07-14 Hewlett-Packard Development Company, L.P. Duplexing web press with drying time control
WO2017075448A1 (fr) * 2015-10-28 2017-05-04 Analog Devices Global Commande d'onduleur de puissance

Also Published As

Publication number Publication date
AU2002248520A1 (en) 2002-09-12
WO2002068900A3 (fr) 2002-10-24

Similar Documents

Publication Publication Date Title
JP5947819B2 (ja) 動作中物体の光学的識別方法
US6236009B1 (en) Apparatus and method for detecting and marking indicia on articles
US20030164876A1 (en) Procedure and device for measuring positions of continuous sheets
US8611613B2 (en) Method and apparatus for checking print products, a computer program and a computer program product
US20140285690A1 (en) Image acquisition method
US20060055721A1 (en) Apparatus and methods of detecting relative position of RF signature on print media
US20020024681A1 (en) Method for determining a printing-image position, and monitoring device for a printing machine
JPH05212987A (ja) 折り丁の均一性を確定する方法及び該方法の実施装置
DE19910244B4 (de) Anordnung zur Überwachung der Lage eines Bogens in Greifern während dessen Förderung durch eine drucktechnische Maschine
AU2008234396B2 (en) Device and method for counting and detecting flat products
WO2002068900A2 (fr) Cible sans marque
US7209600B2 (en) Synchronization of components for printing
WO2002054338A1 (fr) Systeme de vision artificielle pour le traitement du courrier
KR20020026786A (ko) 지엽류 감별 장치
JP2002346984A (ja) 断裁システム及び断裁位置検出方法
CN100572064C (zh) 利用光学成像传感器感应打印介质的打印机构
US7184700B2 (en) Method of determining color register and/or register errors in a printing machine
CA1295711C (fr) Capteur de vitesse de document balaye
US6229608B1 (en) Procedure and system for inspecting a component with leads to determine its fitness for assembly
CN108036778A (zh) 集装箱自动识别系统和识别方法以及港口设施
CN102539818A (zh) 用于印刷系统的机械平台的稳定性检测方法和装置
JPH05340739A (ja) 不等ピッチスプリングの配向検知装置
JPS6072730A (ja) 印刷物の検査方法及びその装置
JP3513364B2 (ja) 基準画像取得方法、乱丁検査装置および乱丁検査方法
JPH0257505B2 (fr)

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A3

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SI SK SL TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase in:

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP