JPS57176485A - Thresholding device - Google Patents

Thresholding device

Info

Publication number
JPS57176485A
JPS57176485A JP56061801A JP6180181A JPS57176485A JP S57176485 A JPS57176485 A JP S57176485A JP 56061801 A JP56061801 A JP 56061801A JP 6180181 A JP6180181 A JP 6180181A JP S57176485 A JPS57176485 A JP S57176485A
Authority
JP
Japan
Prior art keywords
picture
circuit
signal
section
picture signal
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
JP56061801A
Other languages
Japanese (ja)
Inventor
Toshio Kano
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 JP56061801A priority Critical patent/JPS57176485A/en
Publication of JPS57176485A publication Critical patent/JPS57176485A/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)
  • Manipulation Of Pulses (AREA)
  • Image Input (AREA)

Abstract

PURPOSE:To binary encording a picture signal at a threshold level, by detecting the vicinity of a picture section with a picture signal from a photo electric conversion section and automatically lowering a threshold level around the picture section. CONSTITUTION:A picture signal from a photo electric conversion section is amplified at an amplifier 1, divided into two at a sample hold circuit 2 and inputted to an integration circuit 3 and a delay circuit 4. The vicinity of the picture section is detected by a picture signal by comparing an output signal of the integration circuit 3 with a voltage Va at a comparator 5 and this signal is spread by twice a prescribed time DELTAt at a waveform corrector 6. A level converter 7 gives two types of threshold levels Vs to a comparator 8 corresponding to an output signal of the waveform corrector 6, the level is lower near the picture section and higher to non-picture part. The delay circuit 4 delays a picture signal corresponding to the Vs, and the comparator 8 binarizes the picture signal from the circuit 4 at the level Vs from the circuit 7.
JP56061801A 1981-04-23 1981-04-23 Thresholding device Pending JPS57176485A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56061801A JPS57176485A (en) 1981-04-23 1981-04-23 Thresholding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56061801A JPS57176485A (en) 1981-04-23 1981-04-23 Thresholding device

Publications (1)

Publication Number Publication Date
JPS57176485A true JPS57176485A (en) 1982-10-29

Family

ID=13181556

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56061801A Pending JPS57176485A (en) 1981-04-23 1981-04-23 Thresholding device

Country Status (1)

Country Link
JP (1) JPS57176485A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59188786A (en) * 1983-04-11 1984-10-26 Komatsu Ltd Threshold value setting method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59188786A (en) * 1983-04-11 1984-10-26 Komatsu Ltd Threshold value setting method
JPH0529955B2 (en) * 1983-04-11 1993-05-06 Komatsu Mfg Co Ltd

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