CA2362128A1 - System and method for acquiring an optical target - Google Patents

System and method for acquiring an optical target Download PDF

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Publication number
CA2362128A1
CA2362128A1 CA002362128A CA2362128A CA2362128A1 CA 2362128 A1 CA2362128 A1 CA 2362128A1 CA 002362128 A CA002362128 A CA 002362128A CA 2362128 A CA2362128 A CA 2362128A CA 2362128 A1 CA2362128 A1 CA 2362128A1
Authority
CA
Canada
Prior art keywords
frequency
input signal
target
various
analog
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
CA002362128A
Other languages
French (fr)
Other versions
CA2362128C (en
Inventor
Govind Shah
David Goodwin Shaw
Donald Gordon Chandler
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.)
United Parcel Service of America Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2362128A1 publication Critical patent/CA2362128A1/en
Application granted granted Critical
Publication of CA2362128C publication Critical patent/CA2362128C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • 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
    • G06K7/10544—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
    • G06K7/10851—Circuits for pulse shaping, amplifying, eliminating noise signals, checking the function of the sensing device

Abstract

An optical target is acquired by an optical scanning system according to an in-band target frequency in an input signal from an optical scanning device. Both the in-band energy level and the out-of-band energy level of the input signal from the optical scanning device are determined. These two energy levels are compared and a possible detection of the target is determined according to this comparison. A minimum threshold of in-band energy is required in order for the possible detection to be confirmed. The input signal may have various frequencies due to various amounts of magnification of the acquisition target as scanned by the optical scanning device. Thus the input signal may represent the target as various frequencies due to the various amounts of magnification. The various amounts of magnification of the acquisition target are due to various scanning distances between the scanning device and the acquisition target. Magnification compensation is therefore performed by providing an amount of frequency shifting of either the center frequency of a filter or the input signal frequency. The amount of frequency shifting is determined according to scanning distance. The frequency shifting is accomplished by performing digital-to-analog conversion on the digital input signal at a fixed frequency.
The output of the digital-to-analog converter is applied to an analog-to-digital converter where the analog signal is resampled at a varying resampling frequency. When the resampling frequency differs from the sampling frequency the signal is frequency shifted.
Alternately, the resampled signal may be buffered and clocked out, in which case the frequency of the input signal is effectively shifted. In order to vary the amount of frequency shift according to the scanning distance, the resampling frequency applied to the analog-to-digital converter is varied according to the scanning distance. The relationship between the various resampling frequency and the varying scanning distances may be selected to cause the various input frequencies representative of a scanned acquisition target to be shifted to a single predetermined fundamental frequency.
CA002362128A 1991-07-11 1992-07-07 System and method for acquiring an optical target Expired - Lifetime CA2362128C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US72821991A 1991-07-11 1991-07-11
US728,219 1991-07-11
CA002113252A CA2113252C (en) 1991-07-11 1992-07-07 System and method for acquiring an optical target

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002113252A Division CA2113252C (en) 1991-07-11 1992-07-07 System and method for acquiring an optical target

Publications (2)

Publication Number Publication Date
CA2362128A1 true CA2362128A1 (en) 1993-01-21
CA2362128C CA2362128C (en) 2002-09-17

Family

ID=24925912

Family Applications (2)

Application Number Title Priority Date Filing Date
CA002362128A Expired - Lifetime CA2362128C (en) 1991-07-11 1992-07-07 System and method for acquiring an optical target
CA002113252A Expired - Lifetime CA2113252C (en) 1991-07-11 1992-07-07 System and method for acquiring an optical target

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA002113252A Expired - Lifetime CA2113252C (en) 1991-07-11 1992-07-07 System and method for acquiring an optical target

Country Status (12)

Country Link
US (1) US5291564A (en)
EP (3) EP0593682B1 (en)
JP (1) JP3215840B2 (en)
KR (3) KR100225151B1 (en)
AT (1) ATE180911T1 (en)
AU (1) AU672366B2 (en)
CA (2) CA2362128C (en)
DE (3) DE69232088T2 (en)
DK (1) DK0593682T3 (en)
ES (2) ES2165104T3 (en)
GR (1) GR3031002T3 (en)
WO (1) WO1993001566A2 (en)

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ES2139612T3 (en) * 1992-05-26 2000-02-16 United Parcel Service Inc CAMERA READING SYSTEM FOR MULTIPLE CODES.
EP0571913B1 (en) * 1992-05-26 1999-08-04 United Parcel Service Of America, Inc. Method and system for target image acquisition
US5982950A (en) * 1993-08-20 1999-11-09 United Parcel Services Of America, Inc. Frequency shifter for acquiring an optical target
WO1995013606A1 (en) * 1993-11-12 1995-05-18 Exabyte Corporation Method and apparatus for determining and using head parameters in a helical scan recorder
US7387253B1 (en) * 1996-09-03 2008-06-17 Hand Held Products, Inc. Optical reader system comprising local host processor and optical reader
JP2938338B2 (en) * 1994-03-14 1999-08-23 株式会社デンソー Two-dimensional code
ATE190415T1 (en) * 1994-06-07 2000-03-15 United Parcel Service Inc METHOD AND DEVICE FOR DECODING A TWO-DIMENSIONAL SYMBOL IN THE SPACE AREA
US5515447A (en) * 1994-06-07 1996-05-07 United Parcel Service Of America, Inc. Method and apparatus for locating an acquisition target in two-dimensional images by detecting symmetry in two different directions
JP2867904B2 (en) * 1994-12-26 1999-03-10 株式会社デンソー 2D code reader
EP0722148A2 (en) * 1995-01-10 1996-07-17 Welch Allyn, Inc. Bar code reader
DE69636205T2 (en) * 1995-05-31 2007-04-26 Symbol Technologies, Inc. Optical scanner
US5831254A (en) * 1995-12-18 1998-11-03 Welch Allyn, Inc. Exposure control apparatus for use with optical readers
US5814802A (en) * 1996-02-23 1998-09-29 Accu-Sort Systems, Inc. High speed imaging apparatus for CCD based scanners
SE507680C2 (en) * 1997-01-13 1998-07-06 Qualisys Ab Method and apparatus for determining the position of an object
KR100429858B1 (en) * 1997-05-21 2004-06-16 삼성전자주식회사 Apparatus and method for adjusting focus using adaptive filter
US5984078A (en) 1997-08-04 1999-11-16 United Parcel Service Of America, Inc. Automated shuttle sorter for conveyors
DE19840455A1 (en) * 1998-09-04 2000-03-09 Sick Ag Method for operating a bar code reader
US6189702B1 (en) 1998-11-25 2001-02-20 United Parcel Service Of America, Inc. Overhead mounted sorter for conveyors
AU4197200A (en) * 1999-04-07 2000-10-23 Federal Express Corporation System and method for dimensioning objects
US7161688B1 (en) 1999-08-31 2007-01-09 Brett Bonner Mass scanning and dimensioning system
US7118042B2 (en) * 2002-01-18 2006-10-10 Microscan Systems Incorporated Method and apparatus for rapid image capture in an image system
US8146823B2 (en) * 2002-01-18 2012-04-03 Microscan Systems, Inc. Method and apparatus for rapid image capture in an image system
US20050227217A1 (en) * 2004-03-31 2005-10-13 Wilson Andrew D Template matching on interactive surface
US7593593B2 (en) * 2004-06-16 2009-09-22 Microsoft Corporation Method and system for reducing effects of undesired signals in an infrared imaging system
US7911444B2 (en) * 2005-08-31 2011-03-22 Microsoft Corporation Input method for surface of interactive display
US8212857B2 (en) * 2007-01-26 2012-07-03 Microsoft Corporation Alternating light sources to reduce specular reflection
JP4561869B2 (en) * 2008-05-08 2010-10-13 ソニー株式会社 Microbead automatic identification method and microbead
US8104688B2 (en) * 2008-06-16 2012-01-31 Michael Wallace Method and system for identifying a game piece
WO2010123497A1 (en) * 2009-04-21 2010-10-28 Hewlett-Packard Development Company, L.P. Color target read using grayscale information
JP2014106948A (en) * 2012-11-30 2014-06-09 Nippon Electric Glass Co Ltd Two-dimensional information reading device
US9542172B2 (en) 2013-02-05 2017-01-10 Apple Inc. Automatic updating of applications
WO2020118642A1 (en) * 2018-12-13 2020-06-18 华为技术有限公司 Filtering method and device
CN116719005B (en) * 2023-08-10 2023-10-03 南京隼眼电子科技有限公司 Fixed-point data processing method and device based on FPGA and storage medium

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US3611209A (en) * 1969-12-11 1971-10-05 Bell Telephone Labor Inc Digital filter frequency shift modulator
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US3947833A (en) * 1974-11-20 1976-03-30 The United States Of America As Represented By The Secretary Of The Navy Automatic target detection system
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Also Published As

Publication number Publication date
WO1993001566A3 (en) 1993-04-15
DE69233513D1 (en) 2005-06-23
CA2362128C (en) 2002-09-17
DK0593682T3 (en) 1999-11-15
EP0593682B1 (en) 1999-06-02
EP0593682A1 (en) 1994-04-27
CA2113252A1 (en) 1993-01-21
EP0843411A2 (en) 1998-05-20
KR100299557B1 (en) 2001-09-22
EP0844735A2 (en) 1998-05-27
KR100225151B1 (en) 1999-10-15
AU2428192A (en) 1993-02-11
ATE180911T1 (en) 1999-06-15
EP0843411A3 (en) 1998-06-17
EP0844735A3 (en) 1998-06-17
DE69232088D1 (en) 2001-10-31
DE69229345D1 (en) 1999-07-08
DE69233513T2 (en) 2006-01-26
DE69232088T2 (en) 2002-06-06
JP3215840B2 (en) 2001-10-09
CA2113252C (en) 2002-11-12
ES2134218T3 (en) 1999-10-01
US5291564A (en) 1994-03-01
GR3031002T3 (en) 1999-12-31
EP0844735B1 (en) 2005-05-18
ES2165104T3 (en) 2002-03-01
JPH06509891A (en) 1994-11-02
EP0843411B1 (en) 2001-09-26
AU672366B2 (en) 1996-10-03
WO1993001566A2 (en) 1993-01-21
KR100229253B1 (en) 2000-03-15
DE69229345T2 (en) 1999-11-25

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Effective date: 20120709