JPS5834676A - 白レベル基準検出回路 - Google Patents

白レベル基準検出回路

Info

Publication number
JPS5834676A
JPS5834676A JP56132452A JP13245281A JPS5834676A JP S5834676 A JPS5834676 A JP S5834676A JP 56132452 A JP56132452 A JP 56132452A JP 13245281 A JP13245281 A JP 13245281A JP S5834676 A JPS5834676 A JP S5834676A
Authority
JP
Japan
Prior art keywords
white level
signal
image
level reference
peak
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
JP56132452A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0423467B2 (enrdf_load_stackoverflow
Inventor
Yoshiaki Kamimoto
神本　芳明
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 JP56132452A priority Critical patent/JPS5834676A/ja
Publication of JPS5834676A publication Critical patent/JPS5834676A/ja
Publication of JPH0423467B2 publication Critical patent/JPH0423467B2/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)
  • Manipulation Of Pulses (AREA)
  • Character Input (AREA)
  • Image Input (AREA)
  • Facsimile Image Signal Circuits (AREA)
JP56132452A 1981-08-24 1981-08-24 白レベル基準検出回路 Granted JPS5834676A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56132452A JPS5834676A (ja) 1981-08-24 1981-08-24 白レベル基準検出回路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56132452A JPS5834676A (ja) 1981-08-24 1981-08-24 白レベル基準検出回路

Publications (2)

Publication Number Publication Date
JPS5834676A true JPS5834676A (ja) 1983-03-01
JPH0423467B2 JPH0423467B2 (enrdf_load_stackoverflow) 1992-04-22

Family

ID=15081679

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56132452A Granted JPS5834676A (ja) 1981-08-24 1981-08-24 白レベル基準検出回路

Country Status (1)

Country Link
JP (1) JPS5834676A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5105286A (en) * 1989-03-14 1992-04-14 Tetsuo Sakurai Image reading apparatus
US5321526A (en) * 1991-03-26 1994-06-14 Sumitomo Electric Industries, Ltd. White level detection circuit for an optical image reader

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5322310A (en) * 1976-08-13 1978-03-01 Toshiba Corp Picture read system
JPS5480024A (en) * 1977-12-08 1979-06-26 Ricoh Co Ltd Shading correction system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5322310A (en) * 1976-08-13 1978-03-01 Toshiba Corp Picture read system
JPS5480024A (en) * 1977-12-08 1979-06-26 Ricoh Co Ltd Shading correction system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5105286A (en) * 1989-03-14 1992-04-14 Tetsuo Sakurai Image reading apparatus
US5321526A (en) * 1991-03-26 1994-06-14 Sumitomo Electric Industries, Ltd. White level detection circuit for an optical image reader

Also Published As

Publication number Publication date
JPH0423467B2 (enrdf_load_stackoverflow) 1992-04-22

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