KR890004249A - 쉐이딩 보정 방법 - Google Patents

쉐이딩 보정 방법 Download PDF

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Publication number
KR890004249A
KR890004249A KR1019880010814A KR880010814A KR890004249A KR 890004249 A KR890004249 A KR 890004249A KR 1019880010814 A KR1019880010814 A KR 1019880010814A KR 880010814 A KR880010814 A KR 880010814A KR 890004249 A KR890004249 A KR 890004249A
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KR
South Korea
Prior art keywords
scanning period
image sensor
shading correction
document
image
Prior art date
Application number
KR1019880010814A
Other languages
English (en)
Other versions
KR910005351B1 (ko
Inventor
미쯔나리 가노
도시로 우에무라
Original Assignee
미다 가쓰시게
가부시끼가이샤 히다찌 세이사꾸쇼
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.)
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Publication date
Application filed by 미다 가쓰시게, 가부시끼가이샤 히다찌 세이사꾸쇼 filed Critical 미다 가쓰시게
Publication of KR890004249A publication Critical patent/KR890004249A/ko
Application granted granted Critical
Publication of KR910005351B1 publication Critical patent/KR910005351B1/ko

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Classifications

    • 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
    • G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
    • 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
    • G06V10/147—Details of sensors, e.g. sensor lenses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00795—Reading arrangements
    • H04N1/00798—Circuits or arrangements for the control thereof, e.g. using a programmed control device or according to a measured quantity
    • H04N1/00819—Self-calibrating reading means

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • General Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Image Input (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Character Input (AREA)

Abstract

내용 없음

Description

쉐이딩 보정 방법
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제 1 도는 본 발명의 OCR 장치의 전체 구성도. 제 3 도는 영상 감지기 출력 펄스 열을 발생시키기 위한 타이밍도. 제 4 도는 영상 감지기으 출력 펄스를 상세하게 도시한 파형도.

Claims (2)

  1. 영상 감지기, 및 인식될 문자, 도형등의 화상 정보가 기재된 장표가 이 영상 감지기의 시야로 진입한 것을 검출할 수 있는 반사율을 갖는 배경용 반사판을 갖고 있는 쉐이딩 보정 방법에 있어서, 영상 감지기의 주사 타이밍 주기를 제 1 주사 주기로 설정하는 수단, 제 1 주사 주기에서 배경용 반사판을 독취하는 수단, 영상 감지기으 주사 타이밍 주기를 제 1 주사 주기보다 짧은 제 2 주사 주기로 설정하는 수단, 장표를 영상 감지기의 시야로 진입시키는 수단, 제 2 주사 주기하에서 장표의 외형을 검출하는 수단, 검출한 장표의 외형에 기초를 두고 장표상의 화상 정보를 절단하는 수단, 제 1 주사 주기에서 독취된 영상 감지기 출력을 기준으로하여 절단된 화상정보의 쉐이딩 보정을 행하는 수단, 및 쉐이딩 보정후의 화상을 인식하는 수단을 포함하는 것을 특징으로 하는 쉐이딩 보정 방법.
  2. 제 1 항에 있어서, 제 1 주사 주기에서 배경용 반사판을 독취한 때의 영상 감지기 출력이 제 2 주사 주기에서 장표상의 화상정보 기재부분 이외의 대지부를 독취한 때의 영상 감지기 출력과 거의 동일한 것을 특징으로 하는 쉐이딩 보정 방법.
    ※ 참고사항 : 최초출원내용에 의하여 공개하는 것임.
KR1019880010814A 1987-08-26 1988-08-25 쉐이딩 보정 방법 KR910005351B1 (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP62210050A JP2594963B2 (ja) 1987-08-26 1987-08-26 シェーディング補正方式
JP62-210050 1987-08-26

Publications (2)

Publication Number Publication Date
KR890004249A true KR890004249A (ko) 1989-04-21
KR910005351B1 KR910005351B1 (ko) 1991-07-25

Family

ID=16582975

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019880010814A KR910005351B1 (ko) 1987-08-26 1988-08-25 쉐이딩 보정 방법

Country Status (3)

Country Link
US (1) US4984285A (ko)
JP (1) JP2594963B2 (ko)
KR (1) KR910005351B1 (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110097031A (zh) * 2019-05-14 2019-08-06 成都费恩格尔微电子技术有限公司 一种屏下光学指纹图像的校正方法和装置

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0335233A (ja) * 1989-06-30 1991-02-15 Toshiba Corp 画像形成装置
JPH03101364A (ja) * 1989-09-13 1991-04-26 Ricoh Co Ltd 光電変換素子
JP2656123B2 (ja) * 1989-10-20 1997-09-24 キヤノン株式会社 読取装置
US5319433A (en) * 1992-05-18 1994-06-07 Canon Kabushiki Kaisha Electrophotographing apparatus for forming color image
US5793031A (en) * 1993-03-25 1998-08-11 Asahi Kogaku Kogyo Kabushiki Kaisha Two-dimensional encoded symbol reading device with plural operating modes
US5606160A (en) * 1993-03-25 1997-02-25 Asahi Kogaku Kogyo Kabushiki Kaisha Symbol reading device
JP3495410B2 (ja) * 1994-03-16 2004-02-09 ペンタックス株式会社 データシンボル読み取り装置
US6192163B1 (en) * 1996-10-29 2001-02-20 Seiko Epson Corporation Image processing method and image processing apparatus
JP2004187111A (ja) * 2002-12-05 2004-07-02 Nec Viewtechnology Ltd 資料提示装置
US8712188B2 (en) * 2011-04-28 2014-04-29 Hewlett-Packard Development Company, L.P. System and method for document orientation detection
CN113221601A (zh) * 2020-01-21 2021-08-06 深圳富泰宏精密工业有限公司 字符识别方法、装置及计算机可读存储介质

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962681A (en) * 1972-06-19 1976-06-08 Recognition Equipment Incorporated Page width optical character processing method and system
US3872434A (en) * 1973-12-05 1975-03-18 Recognition Equipment Inc Dynamic sample-by-sample automatic gain control
US4408231A (en) * 1981-07-31 1983-10-04 International Business Machines Corporation Method and apparatus for calibrating a linear array scanning system
JPS58121864A (ja) * 1982-01-14 1983-07-20 Konishiroku Photo Ind Co Ltd シエ−デイング補正装置
US4491961A (en) * 1982-02-12 1985-01-01 Burroughs Corporation Pixel correction logic circuit
JPS6098765A (ja) * 1983-11-04 1985-06-01 Fuji Xerox Co Ltd シエ−デイング補正装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110097031A (zh) * 2019-05-14 2019-08-06 成都费恩格尔微电子技术有限公司 一种屏下光学指纹图像的校正方法和装置

Also Published As

Publication number Publication date
KR910005351B1 (ko) 1991-07-25
JPS6454875A (en) 1989-03-02
US4984285A (en) 1991-01-08
JP2594963B2 (ja) 1997-03-26

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