BR0202588A - Método e aparelho para a resolução da distorção de perspectiva em uma imagem de documento e para o cálculo de somas de linhas em imagens - Google Patents

Método e aparelho para a resolução da distorção de perspectiva em uma imagem de documento e para o cálculo de somas de linhas em imagens

Info

Publication number
BR0202588A
BR0202588A BR0202588-4A BR0202588A BR0202588A BR 0202588 A BR0202588 A BR 0202588A BR 0202588 A BR0202588 A BR 0202588A BR 0202588 A BR0202588 A BR 0202588A
Authority
BR
Brazil
Prior art keywords
image
transform
line
perspective
perspective distortion
Prior art date
Application number
BR0202588-4A
Other languages
English (en)
Other versions
BR0202588A8 (pt
Inventor
Christopher R Dance
Original Assignee
Xerox Corp
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 Xerox Corp filed Critical Xerox Corp
Publication of BR0202588A publication Critical patent/BR0202588A/pt
Publication of BR0202588A8 publication Critical patent/BR0202588A8/pt

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/80—Geometric correction
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V20/00—Scenes; Scene-specific elements
    • G06V20/60—Type of objects
    • G06V20/62—Text, e.g. of license plates, overlay texts or captions on TV images
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06V30/14—Image acquisition
    • G06V30/146—Aligning or centring of the image pick-up or image-field
    • G06V30/1475—Inclination or skew detection or correction of characters or of image to be recognised
    • G06V30/1478—Inclination or skew detection or correction of characters or of image to be recognised of characters or characters lines
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06V30/166—Normalisation of pattern dimensions
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Image Analysis (AREA)
  • Image Processing (AREA)
  • Character Input (AREA)
  • Editing Of Facsimile Originals (AREA)

Abstract

"MéTODO E APARELHO PARA A RESOLUçãO DA DISTORçãO DE PERSPECTIVA EM UMA IMAGEM DE DOCUMENTO E PARA O CáLCULO DE SOMAS DE LINHAS EM IMAGENS". Uma distorção de perspectiva é estimada em uma imagem de documento digital, pela detecção de ponto de referência de perspectiva em duas direções, um sendo paralelo a linhas de texto e o outro sendo paralelo às fronteiras de colunas de texto formatado. Os ponto de referência são detectados pela análise de características estatísticas direcionais da imagem. Para a detecção de um ponto de referência, uma primeira transformada de linha estatística é aplicada para transformar a imagem em um espaço de linha, e uma segunda transformada de escore estatístico é aplicada para transformar a imagem em um espaço de ponto de referência. Um pico dominante no espaço de ponto de referência identifica o ponto de referência de perspectiva. Além disso, uma técnica de soma de linha eficiente em termos computacionais, é usada para se efetuar somas de pixeis ao longo de linhas alvo inclinadas (ou curvas) através de uma imagem. A técnica inclui a pré-geração de somas parciais e uma soma ao longo de segmentos de intervalo de uma linha alvo usando as somas parciais.
BRPI0202588A 2001-07-09 2002-07-09 método e aparelho para estimar a perspectiva em uma imagem e método para o cálculo de uma soma de valores de pixel discretos. BR0202588A8 (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09/901,508 US6873732B2 (en) 2001-07-09 2001-07-09 Method and apparatus for resolving perspective distortion in a document image and for calculating line sums in images

Publications (2)

Publication Number Publication Date
BR0202588A true BR0202588A (pt) 2003-04-29
BR0202588A8 BR0202588A8 (pt) 2018-03-06

Family

ID=25414327

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI0202588A BR0202588A8 (pt) 2001-07-09 2002-07-09 método e aparelho para estimar a perspectiva em uma imagem e método para o cálculo de uma soma de valores de pixel discretos.

Country Status (5)

Country Link
US (1) US6873732B2 (pt)
EP (1) EP1276074B1 (pt)
JP (1) JP2003091721A (pt)
BR (1) BR0202588A8 (pt)
DE (1) DE60222722T2 (pt)

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Also Published As

Publication number Publication date
EP1276074A2 (en) 2003-01-15
JP2003091721A (ja) 2003-03-28
US20030026482A1 (en) 2003-02-06
US6873732B2 (en) 2005-03-29
DE60222722T2 (de) 2008-07-17
EP1276074A3 (en) 2004-07-07
EP1276074B1 (en) 2007-10-03
BR0202588A8 (pt) 2018-03-06
DE60222722D1 (de) 2007-11-15

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Legal Events

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B07A Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]
B09B Patent application refused [chapter 9.2 patent gazette]

Free format text: INDEFIRO O PEDIDO DE ACORDO COM O ARTIGO 8O COMBINADO COM ARTIGO 13, ARTIGO 22 DA LPI

B09B Patent application refused [chapter 9.2 patent gazette]

Free format text: MANTIDO O INDEFERIMENTO UMA VEZ QUE NAO FOI APRESENTADO RECURSO DENTRO DO PRAZO LEGAL.

B03H Publication of an application: rectification [chapter 3.8 patent gazette]