JPS5728475A - Picture processing system - Google Patents

Picture processing system

Info

Publication number
JPS5728475A
JPS5728475A JP10325980A JP10325980A JPS5728475A JP S5728475 A JPS5728475 A JP S5728475A JP 10325980 A JP10325980 A JP 10325980A JP 10325980 A JP10325980 A JP 10325980A JP S5728475 A JPS5728475 A JP S5728475A
Authority
JP
Japan
Prior art keywords
density
maximum value
level
differences
difference
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
JP10325980A
Other languages
Japanese (ja)
Inventor
Hirokawa Hayashi
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 JP10325980A priority Critical patent/JPS5728475A/en
Publication of JPS5728475A publication Critical patent/JPS5728475A/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)
  • Control Or Security For Electrophotography (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To prevent the missing of picture signal and noise, by suitably decreasing the threshold level according to the difference between the maximum density level and the average density level than the maximum value of the total sum of differences on density, when the difference is small in a specific video element region. CONSTITUTION:An input picture signal BS scanned, sampled and quantized in a multistate in picture element unit is sequentially read in at a multivalue information storage circuit 1, where the picture information for n-line's share is temporarily stored. Next, a maximum value Omax and an average value Omean are detected at level detecting circuits 2, 3 and delivered to a subtractor 4. The maximum value sigmajmax of the total sum of differences on density sigmaj being the result of the detection for the content of a storage circuit 7, and the compared output at a comparator 5 are applied to an operation circuit 9, where the optimum threshold level L is obtained to be given to a binary circuit 10.
JP10325980A 1980-07-28 1980-07-28 Picture processing system Pending JPS5728475A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10325980A JPS5728475A (en) 1980-07-28 1980-07-28 Picture processing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10325980A JPS5728475A (en) 1980-07-28 1980-07-28 Picture processing system

Publications (1)

Publication Number Publication Date
JPS5728475A true JPS5728475A (en) 1982-02-16

Family

ID=14349438

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10325980A Pending JPS5728475A (en) 1980-07-28 1980-07-28 Picture processing system

Country Status (1)

Country Link
JP (1) JPS5728475A (en)

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