JPS57210774A - White level follower circuit - Google Patents

White level follower circuit

Info

Publication number
JPS57210774A
JPS57210774A JP9491481A JP9491481A JPS57210774A JP S57210774 A JPS57210774 A JP S57210774A JP 9491481 A JP9491481 A JP 9491481A JP 9491481 A JP9491481 A JP 9491481A JP S57210774 A JPS57210774 A JP S57210774A
Authority
JP
Japan
Prior art keywords
white level
document
white
circuit
comparison
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.)
Granted
Application number
JP9491481A
Other languages
English (en)
Japanese (ja)
Other versions
JPS637706B2 (enrdf_load_stackoverflow
Inventor
Norio Kanemitsu
Yasuhiko Yogoshi
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP9491481A priority Critical patent/JPS57210774A/ja
Publication of JPS57210774A publication Critical patent/JPS57210774A/ja
Publication of JPS637706B2 publication Critical patent/JPS637706B2/ja
Granted 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image Input (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Manipulation Of Pulses (AREA)
JP9491481A 1981-06-19 1981-06-19 White level follower circuit Granted JPS57210774A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9491481A JPS57210774A (en) 1981-06-19 1981-06-19 White level follower circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9491481A JPS57210774A (en) 1981-06-19 1981-06-19 White level follower circuit

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP7779086A Division JPS61234172A (ja) 1986-04-04 1986-04-04 白レベル・ホロワ回路

Publications (2)

Publication Number Publication Date
JPS57210774A true JPS57210774A (en) 1982-12-24
JPS637706B2 JPS637706B2 (enrdf_load_stackoverflow) 1988-02-18

Family

ID=14123262

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9491481A Granted JPS57210774A (en) 1981-06-19 1981-06-19 White level follower circuit

Country Status (1)

Country Link
JP (1) JPS57210774A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968082A (ja) * 1982-09-13 1984-04-17 Fujitsu Ltd 白レベル・ホロワ回路
JPS6061861U (ja) * 1983-10-03 1985-04-30 株式会社ピーエフユー イメ−ジ読取り装置
JPS60208170A (ja) * 1984-03-31 1985-10-19 Nippon Telegr & Teleph Corp <Ntt> 画信号の白レベル検出回路
US5027117A (en) * 1988-03-31 1991-06-25 Ricoh Company, Ltd. Conversion using a variable reference based on image density

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968082A (ja) * 1982-09-13 1984-04-17 Fujitsu Ltd 白レベル・ホロワ回路
JPS6061861U (ja) * 1983-10-03 1985-04-30 株式会社ピーエフユー イメ−ジ読取り装置
JPS60208170A (ja) * 1984-03-31 1985-10-19 Nippon Telegr & Teleph Corp <Ntt> 画信号の白レベル検出回路
US5027117A (en) * 1988-03-31 1991-06-25 Ricoh Company, Ltd. Conversion using a variable reference based on image density

Also Published As

Publication number Publication date
JPS637706B2 (enrdf_load_stackoverflow) 1988-02-18

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