JPS5623072A - Setting system for threshold level - Google Patents

Setting system for threshold level

Info

Publication number
JPS5623072A
JPS5623072A JP9845979A JP9845979A JPS5623072A JP S5623072 A JPS5623072 A JP S5623072A JP 9845979 A JP9845979 A JP 9845979A JP 9845979 A JP9845979 A JP 9845979A JP S5623072 A JPS5623072 A JP S5623072A
Authority
JP
Japan
Prior art keywords
addition
result
scanning
signal
picture
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.)
Pending
Application number
JP9845979A
Other languages
Japanese (ja)
Inventor
Shinji Miura
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP9845979A priority Critical patent/JPS5623072A/en
Publication of JPS5623072A publication Critical patent/JPS5623072A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H04N1/40—Picture signal circuits
    • H04N1/403—Discrimination between the two tones in the picture signal of a two-tone original

Landscapes

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

Abstract

PURPOSE:To eliminate the picture information storage memory and ensure a sufficient isolation even for a low-contrast original, by obtaining the density distribution information of the original surface through the preparatory scanning and then deciding the threshold level based on the above density distribution information. CONSTITUTION:Density level counter 10 including the counters 0-31 which increase the count value according to the signal level supplies picture signal MS obtained through the preparatory scanning having the double speed in the secondary scanning direction by selecting the signal of one of output lines l0-l31 which passed through AC converter 12 and decoder 13. On the other hand, control circuit 11 delivers picture clock MC to increase the count value of counter 10 by 1. Then the addition is performed by designating numbers 0 and 1, and this result of addition is given to comparator 10 to be compared with the comparison value. If the result of addition is small, the addition is given repetitively with designation of 2 until the result becomes maximum. And this result is stored in address 0 of memory 16. In the same way, the threshold data are stored in addresses 1, 2 and so on. Then the quantized value of converter 12 is made fresh for comparison 17 via the storage data and every fixed line of the main scanning.
JP9845979A 1979-08-01 1979-08-01 Setting system for threshold level Pending JPS5623072A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9845979A JPS5623072A (en) 1979-08-01 1979-08-01 Setting system for threshold level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9845979A JPS5623072A (en) 1979-08-01 1979-08-01 Setting system for threshold level

Publications (1)

Publication Number Publication Date
JPS5623072A true JPS5623072A (en) 1981-03-04

Family

ID=14220278

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9845979A Pending JPS5623072A (en) 1979-08-01 1979-08-01 Setting system for threshold level

Country Status (1)

Country Link
JP (1) JPS5623072A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS599315A (en) * 1982-07-09 1984-01-18 Sanshin Ind Co Ltd Detent mechanism for clutch
JPS59189777A (en) * 1983-04-12 1984-10-27 Canon Inc Image forming device
JPS60100867A (en) * 1983-09-16 1985-06-04 Nippon Kogaku Kk <Nikon> Picture scanner
JPS61214867A (en) * 1985-03-20 1986-09-24 Canon Inc Picture processing device
JPS62154871A (en) * 1985-12-26 1987-07-09 Konishiroku Photo Ind Co Ltd Color image processor
JPS63183752U (en) * 1987-05-19 1988-11-25
EP0703697A2 (en) * 1994-09-20 1996-03-27 Microbox Dr. Welp GmbH Method of obtaining a twodimensional image matrix and film card scanner therefor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51123512A (en) * 1975-04-22 1976-10-28 Rikagaku Kenkyusho Binary picture reading method
JPS53145525A (en) * 1977-05-25 1978-12-18 Oki Electric Ind Co Ltd Optical character reader

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51123512A (en) * 1975-04-22 1976-10-28 Rikagaku Kenkyusho Binary picture reading method
JPS53145525A (en) * 1977-05-25 1978-12-18 Oki Electric Ind Co Ltd Optical character reader

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS599315A (en) * 1982-07-09 1984-01-18 Sanshin Ind Co Ltd Detent mechanism for clutch
JPH0353498B2 (en) * 1982-07-09 1991-08-15 Sanshin Kogyo Kk
JPS59189777A (en) * 1983-04-12 1984-10-27 Canon Inc Image forming device
JPS60100867A (en) * 1983-09-16 1985-06-04 Nippon Kogaku Kk <Nikon> Picture scanner
JPS61214867A (en) * 1985-03-20 1986-09-24 Canon Inc Picture processing device
JPS62154871A (en) * 1985-12-26 1987-07-09 Konishiroku Photo Ind Co Ltd Color image processor
JPH0513422B2 (en) * 1985-12-26 1993-02-22 Konishiroku Photo Ind
JPS63183752U (en) * 1987-05-19 1988-11-25
EP0703697A2 (en) * 1994-09-20 1996-03-27 Microbox Dr. Welp GmbH Method of obtaining a twodimensional image matrix and film card scanner therefor
EP0703697A3 (en) * 1994-09-20 1996-09-04 Microbox Dr Welp Gmbh & Co Method of obtaining a twodimensional image matrix and film card scanner therefor

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