WO2002015558A3 - Method and apparatus for selective processing of captured images - Google Patents

Method and apparatus for selective processing of captured images Download PDF

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Publication number
WO2002015558A3
WO2002015558A3 PCT/US2001/024464 US0124464W WO0215558A3 WO 2002015558 A3 WO2002015558 A3 WO 2002015558A3 US 0124464 W US0124464 W US 0124464W WO 0215558 A3 WO0215558 A3 WO 0215558A3
Authority
WO
WIPO (PCT)
Prior art keywords
response
marks
color
values
targets
Prior art date
Application number
PCT/US2001/024464
Other languages
French (fr)
Other versions
WO2002015558A2 (en
Inventor
David S Poor
Original Assignee
Ctb Mcgraw Hill Llc
David S Poor
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 Ctb Mcgraw Hill Llc, David S Poor filed Critical Ctb Mcgraw Hill Llc
Priority to US10/344,378 priority Critical patent/US7417774B2/en
Priority to AU2001284710A priority patent/AU2001284710A1/en
Publication of WO2002015558A2 publication Critical patent/WO2002015558A2/en
Publication of WO2002015558A3 publication Critical patent/WO2002015558A3/en

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
    • G06K7/12—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using a selected wavelength, e.g. to sense red marks and ignore blue marks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
    • G06K17/0032—Apparatus for automatic testing and analysing marked record carriers, used for examinations of the multiple choice answer type
    • 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
    • G06K7/1447—Methods for optical code recognition including a method step for retrieval of the optical code extracting optical codes from image or text carrying said optical code
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/143—Sensing or illuminating at different wavelengths
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/20—Image preprocessing
    • G06V10/22—Image preprocessing by selection of a specific region containing or referencing a pattern; Locating or processing of specific regions to guide the detection or recognition
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/20—Image preprocessing
    • G06V10/24—Aligning, centring, orientation detection or correction of the image
    • G06V10/242—Aligning, centring, orientation detection or correction of the image by image rotation, e.g. by 90 degrees
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/20—Image preprocessing
    • G06V10/25—Determination of region of interest [ROI] or a volume of interest [VOI]

Abstract

Methods and apparatus are disclosed for identifying intended response marks in an optically scanned image of a response sheet having key marks and response targets printed in the same color. Pixel darkness values assigned by a digital imaging scanner (10) are used to locate key marks and response targets and to identify response marks (60). Areas of the sheet may be selectively filtered to mask the response targets (20). Alternatively, a color imaging scanner may be used to produce a set of color values, such as RBG values, for each pixel.
PCT/US2001/024464 2000-08-11 2001-08-02 Method and apparatus for selective processing of captured images WO2002015558A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US10/344,378 US7417774B2 (en) 2000-08-11 2001-08-02 Method and apparatus for selective processing of captured images
AU2001284710A AU2001284710A1 (en) 2000-08-11 2001-08-02 Method and apparatus for selective processing of captured images

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US22432700P 2000-08-11 2000-08-11
US60/224,327 2000-08-11

Publications (2)

Publication Number Publication Date
WO2002015558A2 WO2002015558A2 (en) 2002-02-21
WO2002015558A3 true WO2002015558A3 (en) 2002-08-29

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2001/016966 WO2002015170A2 (en) 2000-08-11 2001-05-25 Enhanced data capture from imaged documents
PCT/US2001/024464 WO2002015558A2 (en) 2000-08-11 2001-08-02 Method and apparatus for selective processing of captured images

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/US2001/016966 WO2002015170A2 (en) 2000-08-11 2001-05-25 Enhanced data capture from imaged documents

Country Status (3)

Country Link
US (3) US7573616B2 (en)
AU (2) AU2001264956A1 (en)
WO (2) WO2002015170A2 (en)

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Also Published As

Publication number Publication date
US20040131279A1 (en) 2004-07-08
US7573616B2 (en) 2009-08-11
US20040126036A1 (en) 2004-07-01
AU2001284710A1 (en) 2002-02-25
WO2002015170A2 (en) 2002-02-21
US7911660B2 (en) 2011-03-22
WO2002015170A3 (en) 2002-04-25
WO2002015558A2 (en) 2002-02-21
AU2001264956A1 (en) 2002-02-25
US7417774B2 (en) 2008-08-26
US20080316552A1 (en) 2008-12-25

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