WO1998020444A1 - Systeme de detection de l'emplacement d'un code a barres - Google Patents

Systeme de detection de l'emplacement d'un code a barres Download PDF

Info

Publication number
WO1998020444A1
WO1998020444A1 PCT/US1997/012012 US9712012W WO9820444A1 WO 1998020444 A1 WO1998020444 A1 WO 1998020444A1 US 9712012 W US9712012 W US 9712012W WO 9820444 A1 WO9820444 A1 WO 9820444A1
Authority
WO
WIPO (PCT)
Prior art keywords
barcode
scan
detecting system
position detecting
range
Prior art date
Application number
PCT/US1997/012012
Other languages
English (en)
Inventor
Douglas Ambos
Thomas J. Chisholm
Gary Richard
Original Assignee
Computer Identics Corporation
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 Computer Identics Corporation filed Critical Computer Identics Corporation
Publication of WO1998020444A1 publication Critical patent/WO1998020444A1/fr

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10861—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices sensing of data fields affixed to objects or articles, e.g. coded labels
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
    • G06K7/1404—Methods for optical code recognition
    • G06K7/1439—Methods for optical code recognition including a method step for retrieval of the optical code
    • G06K7/1443—Methods for optical code recognition including a method step for retrieval of the optical code locating of the code in an image

Definitions

  • This invention relates to a barcode position detecting system, and more particularly to such a system which uses object range instead of object height to determine barcode position on an object.
  • Industrial barcode scanners typically scan moving packages over a conveyor system.
  • Line, raster, and especially omnidirectional laser based barcode scanners are sometimes oriented so that multiple packages are in the scan zone, or field of view, at the same time. In this case, it is required to track the position of the packages through the scan zone, and determine the position of any barcode that is read so that the barcode is associated with the correct box. Additionally, it is sometimes required to determine the position of multiple labels on a single package .
  • the extent of the reading area, or height of scan increases over distance from the scanner.
  • the relative position of a barcode within the scan may be determined using the measured time from the start of scan to the barcode, the length of time an entire scan takes, and the position of the endpoints of the line. If the distance from the scanner varies from package to package, the measurement of that distance is required for accurate determination of the label position.
  • One method is to use photoeyes or proximity detectors to break the distance into zones, and read the height of a package as it enters the scan zone.
  • the number of photoeyes required is directly related to the desired accuracy, which in turn is related to the minimum gap between packages or between multiple labels on a single package. If high resolution is required, light curtains (a column of matched emitter-detector photoeye pairs) may be used.
  • a problem with photoeyes and light curtains is that reflectors or matched receivers must be placed on the opposite side of the conveyor. This is not possible for overhead scanning of closely spaced parallel conveyors, especially "double tilt- tray sorters", as there is no room between conveyors, and looking across two or more lanes will of course not work because a package in the one lane will obscure a package in the next lane. This is also not possible for side scanning, where a gap in the conveyor itself would be required to mount the reflectors or receivers to determine the width of the object.
  • the invention results from the realization that a truly versatile and accurate barcode position detecting system can be effected by determining the range from the scanner to the barcode on an object directly using a ranging device which is free from interference from the object or conveyor and combining that range with the location of the barcode along the scan path to ascertain the position of the barcode borne by the object.
  • This invention features a barcode position detecting system for determining the position of a barcode on an object on a conveyor, the system including scanning means for scanning a barcode and range means for determining the range from the scanner to the object bearing the barcode. There are means, responsive to the scanning means, for detecting the location of the barcode along the scan path, and means responsive to the location of the barcode along the scan path and to the range for determining the position of the barcode borne by the object.
  • the scanning means may be a single line scanning means and the range means may include an ultrasonic range device.
  • the means for detecting the location of the barcode along the scan path may include means for determining the difference between the start of the scan and the barcode. The difference may be that between the start of the barcode and the start of the scan, or the center of the barcode and the start of the scan. The difference may be measured in an interval of time, an interval of angle or an interval of distance.
  • the means for determining the position of the barcode borne by the object may include means for defining the beginning and ending scan limits of the scan path at two spaced ranges from the scanner and means responsive to the range and the limits for calculating the position of the bar code on the object.
  • the means for determining the difference between the start of scan and barcode may include means for determining the ratio of the interval between the start of scan and the barcode on the one hand, to the interval of a full scan on the other.
  • Fig. 1 is a schematic diagrammatic view of a barcode system detecting system according to this invention embodied in a single line barcode scanner;
  • Fig. 2 is a schematic drawing illustrating the positions and values used to determine the position of the barcode on a conveyed obj ect ;
  • Fig. 3 is a schematic block diagram of the barcode position detecting system according to this invention embodied in an omnidirectional scanning system;
  • Fig. 4 is a block diagram showing the data structure, composition and flow for detecting and tracking conveyed objects and the position of the barcode on them according to this invention
  • Fig. 5 is a schematic diagram showing the calculation of new end points to locate the range of the barcode relative to the scanner.
  • Fig. 6 is a schematic diagram similar to Fig. 5 showing the calculation of the position of the barcode along the scan line in Fig. 4 to complete the determination of the location of the barcode borne by the object.
  • a single line barcode scanner utilizing the barcode position detecting system 12 according to this invention which includes sonar transmitter receiver head 14 for determining the range "R" between single line scanner 16 and the box 18 or other object being conveyed in a direction into the paper by a conveyor 20.
  • Box 18 carries a barcode 22 which may be printed directly on the box or may be on a label applied to the box.
  • Scanner 16 begins scanning at the start of scan line 24, and sweeps in the direction indicated by arrow 26 to the end of scan line 28. Flying spot or laser beam 30 is thereby swept along line 32 across barcode 22.
  • the start of scan line 24 and end of scan line 28 define the positions where the scan starts and stops and also define the angle of scan 34.
  • Sonar transmit/receive head 14 may be a Model 700 electrostatic transducer and transducer control board Model 607089, both available from The Polaroid Company of Cambridge, Massachusetts, as referred to in U.S. Patent No. 4,920,255, issued April 24, 1990, to Stephen Gabeler, and incorporated by reference in its entirety herein.
  • the beginning 24 and end 28 scan lines or limits of scanner 16 are known.
  • a near limit, known as the beginning scan limits 40 and 42 are indicated as positions X j .yi and x 2 , y 2 , respectively.
  • the ending scan limits 44, 46 are likewise known and are designated x 3 , y 3 and x 4 , y 4 , respectively.
  • new intermediate end points 48 and 50 of line 49 at the level that the barcode appears on the box can be calculated. These intermediate or new end points are designated x 5 , y 5 and x 6 , y 6 .
  • Scanner 16 is assumed to be a conventional scanner using a multifaceted mirror wheel to scan the spot 30 along the scanning path 32. Since path 32 is linear and the scanner path is actually arcuate 52, a conversion must be made using the arctan function along the flat scan surface 54 as is well known by those skilled in the art. After this adjustment the actual position of barcode 22 along a line between new end points 48 and 50 can be calculated.
  • the position of the barcode, designated x 7 , y 7 is calculated by linearly interpolating between x 5 , y 5 and x 6 , y 6 using the ratio between the interval from the start of scan 24 to the barcode 22 and comparing that to the total scan interval between the start of scan 24 and the end of scan 28.
  • This interval can be measured as an angle, a time or a distance, for example.
  • the distance to the barcode can be defined as the distance to the beginning of the barcode, the end of the barcode, the middle of the barcode or any other point relative to the barcode .
  • This approach works with an omnidirectional barcode scanner, system 10a, including omnidirectional scanner 16a, Fig. 3, as well as with the single line barcode scanner of Fig. 1.
  • the boxes 18a, 18aa, 18aaa move in the direction indicated by arrow 60.
  • An inzone photoeye 62 indicates the entrance of each box into the zone of the scan and an outzone photoeye 64 indicates the departure of each box from the scan zone.
  • the scan zone is defined as that area between the start of scan 24a and the end of scan 28a.
  • a tachometer 66 monitors the movement of conveyor 20 to keep track of the position of the boxes 18a, 18aa, 18aaa.
  • the output from photoelectric eyes 62 and 64 and tachometer 66 are delivered to an interface circuit 68 and from there to the zone tracker microprocessor 70.
  • the barcode readout from omnidirectional scanner 16a is delivered to barcode position microprocessor 72; the sonar echo to range microprocessor 74 receives the range information from sonar transmit/receive head 14a and the inzone indication from photoelectric eye 62 and delivers that to zone tracker microprocessor 70 as well.
  • the barcode position information from microprocessor 72 and the zone tracker information from microprocessor 70 contribute to a data structure carried by the storage medium 75.
  • host presentation microprocessor 76 When a box leaves a zone as indicated by outzone photoelectric eye 64, that information is delivered by host presentation microprocessor 76 to an external host computer. While four separate microprocessors are shown, 70, 72, 74 and 76, this is not a necessary limitation of the invention as a single microprocessor could be used to perform all of these functions.
  • a data structure 80, 82, 84 is associated with each box. That data structure is monitored by the zone tracking function 86 performed by zone tracker microprocessor 70 which utilizes the inzone and outzone information 88 from photoelectric eyes 62 and 64 and the position of the box, step 90, on the conveyor as indicated by tachometer 66, along with the range, step 92, to the box determined by sonar range detector 14a to provide the range, and the x,y position of the box to each data structure 80, 82 and 84.
  • zone tracking function 86 performed by zone tracker microprocessor 70 which utilizes the inzone and outzone information 88 from photoelectric eyes 62 and 64 and the position of the box, step 90, on the conveyor as indicated by tachometer 66, along with the range, step 92, to the box determined by sonar range detector 14a to provide the range, and the x,y position of the box to each data structure 80, 82 and 84.
  • zone tracking function 86 performed by zone tracker microprocessor 70 which utilizes the
  • Scanner 16a reads the barcode label 22, step 100, Fig. 3, and for each box that is in the scan zone calculates the new end points 48 and 50, Fig. 2, using the range determined by sonar transmit-receive head 14a. Then for each box in the zone there is calculated, step 102, the new end points 48, 50, Fig. 2, of the scan line across the surface of the box bearing the label . Then there is determined the ratio of the position of the barcode 22 at point x 7 ,y 7 , Fig. 2, along the scan line between points 48 and 50 is compared to the full distance along the scan line between points 48 and 50 to determine the ratio of the two, step 104.
  • step 105 The curvature of the arcuate scan 52, Fig. 2, is compensated for in step 105 and then the x,y position 106 is calculated in step 108.
  • the x,y position of the label is then compared in step 110 with the x,y position of the box as indicated by zone tracker 86. If they match, step 112, the data structure is updated and that box, in this particular case box n 18aaa, is perceived as leaving the zone and so its data structure is updated and the information is put out to the host computer. If there is no match then the system is returned over line 114 to begin again.
  • the x 6 ,y 6 position is calculated in a similar fashion; thus are obtained the two new end points 48 and 50.
  • the distance along line 49 between end points 48 and 50 is calculated as shown in Fig. 6 where t represents the ratio of the distance to the barcode, T barcode , to the overall distance T tota
  • y 7 y 5 +r*(y 6 -y 5 ) (5)

Abstract

L'invention concerne un système (12) de détection de l'emplacement d'un code à barres, permettant de déterminer l'emplacement d'un code à barres (22) sur un objet (18) placé sur un transporteur (20), et comprenant: un dispositif de lecture (16) destiné à lire un code à barres; un dispositif de mesure (14) permettant de déterminer la distance séparant le dispositif de lecture de l'objet portant le code à barres; un dispositif, réagissant au dispositif de lecture, permettant de détecter l'emplacement du code à barres le long de l'axe de balayage; ainsi qu'un dispositif réagissant à la distance et à l'emplacement du code à barres le long de l'axe de balayage, destiné à déterminer l'emplacement du code à barres que porte l'objet.
PCT/US1997/012012 1996-11-04 1997-07-10 Systeme de detection de l'emplacement d'un code a barres WO1998020444A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US74352496A 1996-11-04 1996-11-04
US08/743,524 1996-11-04

Publications (1)

Publication Number Publication Date
WO1998020444A1 true WO1998020444A1 (fr) 1998-05-14

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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7843595B2 (en) 2005-09-19 2010-11-30 Silverbrook Research Pty Ltd Printing a calendar using a mobile device
US7841527B2 (en) 2005-09-19 2010-11-30 Silverbrook Research Pty Ltd Method and system for associating a sticker and an object in a computer system
US7843596B2 (en) 2005-09-19 2010-11-30 Silverbrook Research Pty Ltd Printing a ticket using a mobile device
US7848777B2 (en) 2005-09-19 2010-12-07 Silverbrook Research Pty Ltd Printing a puzzle using a mobile device
US7855805B2 (en) 2005-09-19 2010-12-21 Silverbrook Research Pty Ltd Printing a competition entry form using a mobile device
US7856225B2 (en) 2005-09-19 2010-12-21 Silverbrook Research Pty Ltd Retrieving a program state via a coded surface
US7857204B2 (en) 2005-09-19 2010-12-28 Silverbrook Research Pty Ltd Reusable sticker
US7857217B2 (en) 2005-09-19 2010-12-28 Silverbrook Research Pty Ltd Link software object to sticker
US7860531B2 (en) 2005-09-19 2010-12-28 Silverbrook Research Pty Ltd Retrieving content via a coded surface
US7880911B2 (en) 2005-09-19 2011-02-01 Silverbrook Research Pty Ltd Printing a position using a mobile device
US7907968B2 (en) * 1999-09-17 2011-03-15 Silverbrook Research Pty Ltd Retrieving contact details using a printed medium
US7917171B2 (en) 2005-09-19 2011-03-29 Silverbrook Research Pty Ltd Printing a receipt using a mobile device
US7920896B2 (en) 2005-09-19 2011-04-05 Kia Silverbrook Printing an almanac using a mobile device
US7920855B2 (en) 2005-09-19 2011-04-05 Silverbrook Research Pty Ltd Printing content on a print medium
US7920854B2 (en) 2005-09-19 2011-04-05 Silverbrook Research Pty Ltd Printing a map using a mobile device
US7918390B2 (en) 2005-09-19 2011-04-05 Silverbrook Research Pty Ltd Printing educational material using a mobile device
US7924450B2 (en) 2005-09-19 2011-04-12 Silverbrook Research Pty Ltd Reprint card on a mobile device
US7945943B2 (en) 2005-09-19 2011-05-17 Silverbrook Research Pty Ltd Retrieving an access token via a coded surface
US7953387B2 (en) 2005-09-19 2011-05-31 Silverbrook Research Pty Ltd Retrieving a program via a coded surface
US7953386B2 (en) 2005-09-19 2011-05-31 Silverbrook Research Pty Ltd Bill per card print
US7970435B2 (en) 2005-09-19 2011-06-28 Silverbrook Research Pty Ltd Printing an advertisement using a mobile device
US7988042B2 (en) 2005-09-19 2011-08-02 Silverbrook Research Pty Ltd Method for playing a request on a player device
US7992213B2 (en) 2005-09-19 2011-08-02 Silverbrook Research Pty Ltd Gaining access via a coded surface
US8016202B2 (en) 2005-09-19 2011-09-13 Silverbrook Research Pty Ltd Archiving printed content
US8072629B2 (en) 2005-09-19 2011-12-06 Silverbrook Research Pty Ltd Print subscribed content on a mobile device
US8081351B2 (en) 2005-09-19 2011-12-20 Silverbrook Research Pty Ltd Mobile phone handset
US8079511B2 (en) 2005-09-19 2011-12-20 Silverbrook Research Pty Ltd Online association of a digital photograph with an indicator
US8090403B2 (en) 2005-09-19 2012-01-03 Silverbrook Research Pty Ltd Mobile telecommunications device
US8091774B2 (en) 2005-09-19 2012-01-10 Silverbrook Research Pty Ltd Printing system using a cellular telephone
US9778450B2 (en) 2014-09-05 2017-10-03 Diagnostic Instruments, Inc. Microscope accessory

Citations (4)

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US4920255A (en) * 1988-10-31 1990-04-24 Stephen C. Gabeler Automatic incremental focusing scanner system
US5483051A (en) * 1993-11-04 1996-01-09 Datalogic S.P.A. Laser bar code reader measuring phase of the pulse laser to determine the distance
US5525788A (en) * 1988-10-21 1996-06-11 Symbol Technologies Inc. System for scanning bar code symbols on moving articles using a camera and scanner
US5534684A (en) * 1994-08-30 1996-07-09 Norand Corporation Portable optical reader with motion sensing system and method

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US5525788A (en) * 1988-10-21 1996-06-11 Symbol Technologies Inc. System for scanning bar code symbols on moving articles using a camera and scanner
US4920255A (en) * 1988-10-31 1990-04-24 Stephen C. Gabeler Automatic incremental focusing scanner system
US5483051A (en) * 1993-11-04 1996-01-09 Datalogic S.P.A. Laser bar code reader measuring phase of the pulse laser to determine the distance
US5534684A (en) * 1994-08-30 1996-07-09 Norand Corporation Portable optical reader with motion sensing system and method

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7907968B2 (en) * 1999-09-17 2011-03-15 Silverbrook Research Pty Ltd Retrieving contact details using a printed medium
US8112120B2 (en) 1999-09-17 2012-02-07 Silverbrook Research Pty Ltd Contact details retrieval using a printed medium
US7920854B2 (en) 2005-09-19 2011-04-05 Silverbrook Research Pty Ltd Printing a map using a mobile device
US7857204B2 (en) 2005-09-19 2010-12-28 Silverbrook Research Pty Ltd Reusable sticker
US7924450B2 (en) 2005-09-19 2011-04-12 Silverbrook Research Pty Ltd Reprint card on a mobile device
US7856225B2 (en) 2005-09-19 2010-12-21 Silverbrook Research Pty Ltd Retrieving a program state via a coded surface
US7945943B2 (en) 2005-09-19 2011-05-17 Silverbrook Research Pty Ltd Retrieving an access token via a coded surface
US7857217B2 (en) 2005-09-19 2010-12-28 Silverbrook Research Pty Ltd Link software object to sticker
US7860531B2 (en) 2005-09-19 2010-12-28 Silverbrook Research Pty Ltd Retrieving content via a coded surface
US7880911B2 (en) 2005-09-19 2011-02-01 Silverbrook Research Pty Ltd Printing a position using a mobile device
US7843596B2 (en) 2005-09-19 2010-11-30 Silverbrook Research Pty Ltd Printing a ticket using a mobile device
US7917171B2 (en) 2005-09-19 2011-03-29 Silverbrook Research Pty Ltd Printing a receipt using a mobile device
US7920896B2 (en) 2005-09-19 2011-04-05 Kia Silverbrook Printing an almanac using a mobile device
US7953387B2 (en) 2005-09-19 2011-05-31 Silverbrook Research Pty Ltd Retrieving a program via a coded surface
US7843595B2 (en) 2005-09-19 2010-11-30 Silverbrook Research Pty Ltd Printing a calendar using a mobile device
US7918390B2 (en) 2005-09-19 2011-04-05 Silverbrook Research Pty Ltd Printing educational material using a mobile device
US7855805B2 (en) 2005-09-19 2010-12-21 Silverbrook Research Pty Ltd Printing a competition entry form using a mobile device
US7848777B2 (en) 2005-09-19 2010-12-07 Silverbrook Research Pty Ltd Printing a puzzle using a mobile device
US7920855B2 (en) 2005-09-19 2011-04-05 Silverbrook Research Pty Ltd Printing content on a print medium
US7953386B2 (en) 2005-09-19 2011-05-31 Silverbrook Research Pty Ltd Bill per card print
US7970435B2 (en) 2005-09-19 2011-06-28 Silverbrook Research Pty Ltd Printing an advertisement using a mobile device
US7988042B2 (en) 2005-09-19 2011-08-02 Silverbrook Research Pty Ltd Method for playing a request on a player device
US7992213B2 (en) 2005-09-19 2011-08-02 Silverbrook Research Pty Ltd Gaining access via a coded surface
US8016202B2 (en) 2005-09-19 2011-09-13 Silverbrook Research Pty Ltd Archiving printed content
US8072629B2 (en) 2005-09-19 2011-12-06 Silverbrook Research Pty Ltd Print subscribed content on a mobile device
US8081351B2 (en) 2005-09-19 2011-12-20 Silverbrook Research Pty Ltd Mobile phone handset
US8079511B2 (en) 2005-09-19 2011-12-20 Silverbrook Research Pty Ltd Online association of a digital photograph with an indicator
US8090403B2 (en) 2005-09-19 2012-01-03 Silverbrook Research Pty Ltd Mobile telecommunications device
US8091774B2 (en) 2005-09-19 2012-01-10 Silverbrook Research Pty Ltd Printing system using a cellular telephone
US7841527B2 (en) 2005-09-19 2010-11-30 Silverbrook Research Pty Ltd Method and system for associating a sticker and an object in a computer system
US9778450B2 (en) 2014-09-05 2017-10-03 Diagnostic Instruments, Inc. Microscope accessory

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