CA2265423C - Classification-driven thresholding of a normalized grayscale image - Google Patents

Classification-driven thresholding of a normalized grayscale image Download PDF

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Publication number
CA2265423C
CA2265423C CA002265423A CA2265423A CA2265423C CA 2265423 C CA2265423 C CA 2265423C CA 002265423 A CA002265423 A CA 002265423A CA 2265423 A CA2265423 A CA 2265423A CA 2265423 C CA2265423 C CA 2265423C
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CA
Canada
Prior art keywords
image
candidate
referent
images
distance
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 - Fee Related
Application number
CA002265423A
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English (en)
French (fr)
Other versions
CA2265423A1 (en
Inventor
Radovan V. Krtolica
Roger D. Melen
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.)
Canon Inc
Original Assignee
Canon 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 Canon Inc filed Critical Canon Inc
Publication of CA2265423A1 publication Critical patent/CA2265423A1/en
Application granted granted Critical
Publication of CA2265423C publication Critical patent/CA2265423C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
    • G06V30/10—Character recognition
    • G06V30/16—Image preprocessing
    • G06V30/162—Quantising the image signal
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
    • G06V30/10—Character recognition

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  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Character Discrimination (AREA)
  • Image Analysis (AREA)
  • Character Input (AREA)
CA002265423A 1998-03-13 1999-03-12 Classification-driven thresholding of a normalized grayscale image Expired - Fee Related CA2265423C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/042,016 1998-03-13
US09/042,016 US6266445B1 (en) 1998-03-13 1998-03-13 Classification-driven thresholding of a normalized grayscale image

Publications (2)

Publication Number Publication Date
CA2265423A1 CA2265423A1 (en) 1999-09-13
CA2265423C true CA2265423C (en) 2002-10-15

Family

ID=21919592

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002265423A Expired - Fee Related CA2265423C (en) 1998-03-13 1999-03-12 Classification-driven thresholding of a normalized grayscale image

Country Status (5)

Country Link
US (1) US6266445B1 (enExample)
EP (1) EP0949580B1 (enExample)
JP (1) JP4497574B2 (enExample)
CA (1) CA2265423C (enExample)
DE (1) DE69931211D1 (enExample)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100295225B1 (ko) * 1997-07-31 2001-07-12 윤종용 컴퓨터에서 영상정보 검색장치 및 방법
JP3965983B2 (ja) * 2001-11-30 2007-08-29 松下電工株式会社 画像処理方法およびその装置
US7590260B2 (en) * 2003-09-25 2009-09-15 Siemens Aktiengesellschaft Method and apparatus for video coding by validation matrix
CN100369051C (zh) * 2005-01-11 2008-02-13 富士通株式会社 灰度字符词典的生成装置
DE102006016602B4 (de) * 2006-04-06 2007-12-13 Siemens Ag Verfahren zur Erkennung einer Postsendungsinformation
US7870140B2 (en) 2006-06-12 2011-01-11 D&S Consultants, Inc. System and method of incorporating user preferences in image searches
US7869657B2 (en) 2006-06-12 2011-01-11 D & S Consultants, Inc. System and method for comparing images using an edit distance
US8027549B2 (en) 2006-06-12 2011-09-27 D&S Consultants, Inc. System and method for searching a multimedia database using a pictorial language
US8311341B1 (en) 2006-11-29 2012-11-13 D & S Consultants, Inc. Enhanced method for comparing images using a pictorial edit distance
US8504546B2 (en) 2006-11-29 2013-08-06 D&S Consultants, Inc. Method and system for searching multimedia content
US7921120B2 (en) 2006-11-30 2011-04-05 D&S Consultants Method and system for image recognition using a similarity inverse matrix
US7773811B2 (en) 2006-12-06 2010-08-10 D & S Consultants, Inc. Method and system for searching a database of graphical data
CN102496163B (zh) * 2011-11-03 2013-07-17 长安大学 一种基于灰度极值的背景重构方法
US9940511B2 (en) * 2014-05-30 2018-04-10 Kofax, Inc. Machine print, hand print, and signature discrimination

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58161470A (ja) * 1982-03-18 1983-09-26 Toshiyuki Sakai 映像信号２値化方式
JPH0245892A (ja) * 1988-08-08 1990-02-15 Mitsubishi Electric Corp 文字認識方法及びその装置
US5081690A (en) 1990-05-08 1992-01-14 Eastman Kodak Company Row-by-row segmentation and thresholding for optical character recognition
US5274714A (en) * 1990-06-04 1993-12-28 Neuristics, Inc. Method and apparatus for determining and organizing feature vectors for neural network recognition
US5307424A (en) * 1990-12-12 1994-04-26 Eberhard Kuehl Character recognition system
US5987170A (en) * 1992-09-28 1999-11-16 Matsushita Electric Industrial Co., Ltd. Character recognition machine utilizing language processing
US5875264A (en) * 1993-12-03 1999-02-23 Kaman Sciences Corporation Pixel hashing image recognition system
JP3375766B2 (ja) * 1994-12-27 2003-02-10 松下電器産業株式会社 文字認識装置
US5850480A (en) * 1996-05-30 1998-12-15 Scan-Optics, Inc. OCR error correction methods and apparatus utilizing contextual comparison
US5999664A (en) * 1997-11-14 1999-12-07 Xerox Corporation System for searching a corpus of document images by user specified document layout components

Also Published As

Publication number Publication date
EP0949580A2 (en) 1999-10-13
JPH11312220A (ja) 1999-11-09
DE69931211D1 (de) 2006-06-14
EP0949580A3 (en) 2001-02-14
US6266445B1 (en) 2001-07-24
JP4497574B2 (ja) 2010-07-07
EP0949580B1 (en) 2006-05-10
CA2265423A1 (en) 1999-09-13

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