KR920022822A - Binarization Method Using Local Maximum and Minimum Brightness Values - Google Patents

Binarization Method Using Local Maximum and Minimum Brightness Values Download PDF

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Publication number
KR920022822A
KR920022822A KR1019910008608A KR910008608A KR920022822A KR 920022822 A KR920022822 A KR 920022822A KR 1019910008608 A KR1019910008608 A KR 1019910008608A KR 910008608 A KR910008608 A KR 910008608A KR 920022822 A KR920022822 A KR 920022822A
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South Korea
Prior art keywords
pixel
binarization
local
current pixel
current
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KR1019910008608A
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Korean (ko)
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KR930007984B1 (en
Inventor
강구수
이수열
김서규
김재호
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정용문
삼성전자 주식회사
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Publication of KR920022822A publication Critical patent/KR920022822A/en
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Publication of KR930007984B1 publication Critical patent/KR930007984B1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/41Bandwidth or redundancy reduction
    • H04N1/411Bandwidth or redundancy reduction for the transmission or storage or reproduction of two-tone pictures, e.g. black and white pictures

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

내용 없음.No content.

Description

국부적인 최대 및 최소 밝기값을 이용한 이치화 방법Binarization Method Using Local Maximum and Minimum Brightness Values

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명을 수행하기 위한 팩시밀리 시스템의 블럭구성도,1 is a block diagram of a facsimile system for carrying out the present invention;

제2도는 본 발명에 따른 흐름도,2 is a flow chart according to the invention,

제3도는 본 발명의 국부 밝기차를 결정하기 위한 검색 윈도우 예시도.3 is an exemplary search window for determining a local brightness difference of the present invention.

Claims (5)

화성처리 시스템의 국부적인 최대 및 최소 밝기값을 이용한 이치화 방법에 있어서, 원고를 화소 단위로 주사 및 설정 계조의 화상 데이타로 변환하여 현재 화소값을 버퍼 저장하는 주사과정과, 상기 주사과정의 현재 화소값이 제1역치보다 밝으면 현재 화소를 "백"으로 이치화하고 제2역치보다 어두우면 "흑"으로 이치화하는 제1이치화 과정과, 상기 제1이치화 과정에서 현재 화소의 밝기값이 제1,제2역치의 중간 밝기일시 현재의 화소에 대한 검색 윈도우 내의 국부밝기차를 결정하는 밝기차 결정과정과, 상기 결정된 국부 밝기차가 제3역치보다 작을시 현재 희소를 "백"으로 이치화하는 제2이치화 과정과, 상기 제2이치화 과정에서 국부 밝기차가 제3역치 보다 작지 않을시 현재 화소값을 국부 밝기값과 비교하여 밝으면 "백"으로 이치화하고 어두우면 "흑"으로 이치화하는 제3이치화 과정으로 이루어짐을 특징으로 하는 국부적인 최대 및 최소 밝기값을 이용한 이치화 방법.In the binarization method using local maximum and minimum brightness values of a chemical conversion processing system, a scanning process for converting an original into pixel data and converting the image into image data of a predetermined gray scale to buffer and store the current pixel value, and the current pixel of the scanning process A first binarization process that binarizes the current pixel to "white" if the value is brighter than the first threshold value, and binarizes it to "black" if it is darker than the second threshold value; A brightness difference determining process for determining a local brightness difference in a search window for the current pixel at a second brightness moment and a second threshold, and a second binarization for binarizing the current sparse to "white" when the determined local brightness difference is less than a third threshold. And when the local brightness difference is not smaller than the third threshold in the second binarization process, the current pixel value is compared with the local brightness value and binarized to "white" if dark, and "black" if dark. The binarizing method using the local maximum and minimum brightness values, characterized by constituted by any third binarizing process for binarizing a. 제1항에 있어서, 상기 밝기차 결정과정의 검색윈도우가 현재 화소 및 현재 화소에 인접한 화소들로 이루어짐을 특징으로 하는 국부적인 최대 및 최소 밝기값을 이용한 이치화 방법.The method of claim 1, wherein the search window of the brightness difference determination process comprises a current pixel and pixels adjacent to the current pixel. 제1항에 있어서, 상기 이치화 방법이 상기 제1, 제2,제3 이치화 과정수행후 원고에 대한 주사완료 여부를 검사하여 완료되지 않았을시 상기 주사 과정으로 진행하고 주사완료시 종료하는 종료과정을 더 포함하여 이루어 짐을 특징으로 하는 국부적인 최대 및 최소 밝기값을 이용한 이치화 방법.The method of claim 1, wherein the binarization method checks whether or not the document is scanned after completion of the first, second, and third binarization processes, and proceeds to the scanning process when the completion of the binarization method is not completed. A binarization method using local maximum and minimum brightness values, characterized in that further comprises. 제2항에 있어서, 상기 제2이치화 과정의 국부 밝기값(Bv)이 상기 제1역치와 제2역치 사이에서 국부적인 특성에 의해 추출하는 것임을 특징으로 하는 국부적인 최대 및 최소 밝기값을 이용한 이치화 방법.3. The binarization using local maximum and minimum brightness values according to claim 2, wherein the local brightness value Bv of the second binarization process is extracted by a local characteristic between the first threshold value and the second threshold value. Way. 제2항에 있어서, 상기 검색윈도우가 현재화소와, 상기 현재화소에 대하여 1라인 이전라인의 현재 열의 화소와, 상기 1라인 이전라인의 현재열의 화소에 대하여 1화소 전후열의 화소와, 상기 현재화소의 1화소 이전 화소로 이루어짐을 특징으로 하는 국부적인 최대 및 최소 밝기값을 이용한 이치화 방법.The display window of claim 2, wherein the search window includes a current pixel, a pixel in a current column of a line one line before the current pixel, a pixel of one pixel before and after the pixel of the current column of the one line previous line, and the current pixel. A binarization method using local maximum and minimum brightness values, characterized in that the pixel is one pixel before. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019910008608A 1991-05-27 1991-05-27 Two-tone picture method for fax KR930007984B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019910008608A KR930007984B1 (en) 1991-05-27 1991-05-27 Two-tone picture method for fax

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Application Number Priority Date Filing Date Title
KR1019910008608A KR930007984B1 (en) 1991-05-27 1991-05-27 Two-tone picture method for fax

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KR920022822A true KR920022822A (en) 1992-12-19
KR930007984B1 KR930007984B1 (en) 1993-08-25

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Publication number Priority date Publication date Assignee Title
KR100246440B1 (en) * 1997-08-08 2000-03-15 윤종용 Local binarization method for the image system based on shuttle scanning

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