JPS57116478A - Method and device for half tone - Google Patents

Method and device for half tone

Info

Publication number
JPS57116478A
JPS57116478A JP56001905A JP190581A JPS57116478A JP S57116478 A JPS57116478 A JP S57116478A JP 56001905 A JP56001905 A JP 56001905A JP 190581 A JP190581 A JP 190581A JP S57116478 A JPS57116478 A JP S57116478A
Authority
JP
Japan
Prior art keywords
image signal
level
signal
inputted
binary
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
JP56001905A
Other languages
Japanese (ja)
Inventor
Kenji Tanimoto
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.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox 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 Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP56001905A priority Critical patent/JPS57116478A/en
Publication of JPS57116478A publication Critical patent/JPS57116478A/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 Image Signal Circuits (AREA)

Abstract

PURPOSE:To reproduce half tone securely without spoiling binary-coding processing by selecting one different threshold level in accordance with the level of an image signal to be binary-coded, by referring to a preceding image signal when performing the threshold processing of the image signal. CONSTITUTION:Image information on an original is read by a photosensor 11 and after the amplification of a video amplifier 12, background correction is made by an automatic background correcting circuit 13 to output an image signal which has constant amplitude. This image signal is inputted to the terminal I of a comparator 14, whose output is inputted to the terminal D of a D type FF15; and a sampling pulse is applied to the clock terminal C of the FF15. The output signal of this FF15 is inputted to the amplifier 16 of a threshold generating circuit 17, and the level of the voltage to the comparator is varied with the output voltage of the amplifier 16. Then, one threshold level is selected on the basis of the level of the signal by referring to the precedent image signal to reproduce half tone securely without spoiling the processing of a binary-coded signal.
JP56001905A 1981-01-09 1981-01-09 Method and device for half tone Pending JPS57116478A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56001905A JPS57116478A (en) 1981-01-09 1981-01-09 Method and device for half tone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56001905A JPS57116478A (en) 1981-01-09 1981-01-09 Method and device for half tone

Publications (1)

Publication Number Publication Date
JPS57116478A true JPS57116478A (en) 1982-07-20

Family

ID=11514587

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56001905A Pending JPS57116478A (en) 1981-01-09 1981-01-09 Method and device for half tone

Country Status (1)

Country Link
JP (1) JPS57116478A (en)

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