JPS5745776A - Document information pickup method - Google Patents

Document information pickup method

Info

Publication number
JPS5745776A
JPS5745776A JP55119818A JP11981880A JPS5745776A JP S5745776 A JPS5745776 A JP S5745776A JP 55119818 A JP55119818 A JP 55119818A JP 11981880 A JP11981880 A JP 11981880A JP S5745776 A JPS5745776 A JP S5745776A
Authority
JP
Japan
Prior art keywords
threshold value
inputted
binarized data
less
generator
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
JP55119818A
Other languages
Japanese (ja)
Inventor
Mutsuo Ogawa
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 JP55119818A priority Critical patent/JPS5745776A/en
Publication of JPS5745776A publication Critical patent/JPS5745776A/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 the binarized data with fidelity even if a half tone is in mixture, by preparing a fixed threshold value of a low level, and picking up the binarized data with this fixed threshold value, if the run length of the binarized data is a prescribed value or less through this threshold value. CONSTITUTION:Scanning is made twice for a scanner with an X clock and a shift clock and a Y clock is inputted with a variable threshold value generator 11 to switch the threshold value sequentially. A video signal (a) outputted from this scanner 9 is compared with a threshold value signal b of a low level at the fixed threshold value generator 10 for binarization and the result is inputted to a run length inspector 14. Black level is inspected at the inspector 14 and 1 is inputted to a buffer memory 15 only when it is a prescribed value or less. At the pickup of a transmission data, the video signal (a) and the threshold value d from the generator 11 are compared at a comparator 13 to be inputted to a logical circuit. The output from the memory 15 and that of a comparator 12 are applied to the logical circuit to output data when a binarized data is a prescribed value or less.
JP55119818A 1980-09-01 1980-09-01 Document information pickup method Pending JPS5745776A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55119818A JPS5745776A (en) 1980-09-01 1980-09-01 Document information pickup method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55119818A JPS5745776A (en) 1980-09-01 1980-09-01 Document information pickup method

Publications (1)

Publication Number Publication Date
JPS5745776A true JPS5745776A (en) 1982-03-15

Family

ID=14770998

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55119818A Pending JPS5745776A (en) 1980-09-01 1980-09-01 Document information pickup method

Country Status (1)

Country Link
JP (1) JPS5745776A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52109322A (en) * 1976-03-10 1977-09-13 Hitachi Ltd Gradation binary value signal generating device
JPS5534558A (en) * 1978-08-31 1980-03-11 Fujitsu Ltd Signal process system for optical detector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52109322A (en) * 1976-03-10 1977-09-13 Hitachi Ltd Gradation binary value signal generating device
JPS5534558A (en) * 1978-08-31 1980-03-11 Fujitsu Ltd Signal process system for optical detector

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