JPS6210069B2 - - Google Patents

Info

Publication number
JPS6210069B2
JPS6210069B2 JP54059971A JP5997179A JPS6210069B2 JP S6210069 B2 JPS6210069 B2 JP S6210069B2 JP 54059971 A JP54059971 A JP 54059971A JP 5997179 A JP5997179 A JP 5997179A JP S6210069 B2 JPS6210069 B2 JP S6210069B2
Authority
JP
Japan
Prior art keywords
level
reference value
signal
frequency
image
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.)
Expired
Application number
JP54059971A
Other languages
English (en)
Japanese (ja)
Other versions
JPS55151860A (en
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 JP5997179A priority Critical patent/JPS55151860A/ja
Publication of JPS55151860A publication Critical patent/JPS55151860A/ja
Publication of JPS6210069B2 publication Critical patent/JPS6210069B2/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
    • 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)
  • Image Input (AREA)
  • Facsimile Heads (AREA)
  • Facsimile Image Signal Circuits (AREA)
JP5997179A 1979-05-16 1979-05-16 Reference level setting method for picture reading signal Granted JPS55151860A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5997179A JPS55151860A (en) 1979-05-16 1979-05-16 Reference level setting method for picture reading signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5997179A JPS55151860A (en) 1979-05-16 1979-05-16 Reference level setting method for picture reading signal

Publications (2)

Publication Number Publication Date
JPS55151860A JPS55151860A (en) 1980-11-26
JPS6210069B2 true JPS6210069B2 (enrdf_load_stackoverflow) 1987-03-04

Family

ID=13128557

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5997179A Granted JPS55151860A (en) 1979-05-16 1979-05-16 Reference level setting method for picture reading signal

Country Status (1)

Country Link
JP (1) JPS55151860A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5821986A (ja) * 1981-08-03 1983-02-09 Nippon Telegr & Teleph Corp <Ntt> 画像符号化方式

Also Published As

Publication number Publication date
JPS55151860A (en) 1980-11-26

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