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JPS56157575A - Signal procession device - Google Patents

Signal procession device

Info

Publication number
JPS56157575A
JPS56157575A JP6056580A JP6056580A JPS56157575A JP S56157575 A JPS56157575 A JP S56157575A JP 6056580 A JP6056580 A JP 6056580A JP 6056580 A JP6056580 A JP 6056580A JP S56157575 A JPS56157575 A JP S56157575A
Authority
JP
Japan
Prior art keywords
signal
voltage
inputted
converter
analogue
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.)
Granted
Application number
JP6056580A
Other languages
Japanese (ja)
Other versions
JPS6339140B2 (en
Inventor
Mitsuharu Tadauchi
Kiyohiko Tanno
Taizo Nakano
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.)
Hitachi Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Hitachi Ltd
Nippon Telegraph and Telephone Corp
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 Hitachi Ltd, Nippon Telegraph and Telephone Corp filed Critical Hitachi Ltd
Priority to JP6056580A priority Critical patent/JPS56157575A/en
Priority to US06/260,090 priority patent/US4420742A/en
Priority to EP81103441A priority patent/EP0039899B1/en
Priority to DE8181103441T priority patent/DE3168865D1/en
Publication of JPS56157575A publication Critical patent/JPS56157575A/en
Publication of JPS6339140B2 publication Critical patent/JPS6339140B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/20—Image preprocessing
    • G06V10/28—Quantising the image, e.g. histogram thresholding for discrimination between background and foreground patterns

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Image Input (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To make an analogue signal multilevel with a high precision and a small- sized device without requiring an electrically complicated computation, by providing a peak value signal generating means. CONSTITUTION:An analogue signal A of all white is inputted to a peak value signal voltage generating circuit 2, and a peak hold voltage B is generated as the output of the circuit 2. Next, an A/D converter 3 subjects the signal A, which is inputted again, to A/D conversion for all picture elements of one scanning line on a basis of the signal B successively. This converted digital signal C is stored in corresponding addresses of a storage means 4 successively. Next, in the multilevel processing operation, the analogue information signal A including picture information is inputted to a terminal 1. Synchronously with this input, the distortion characteristic digital signal stored in the address corresponding to each picture element position is read out from the means 4 and is inputted to a D/A converter 5. The voltage B is input to this converter 5, and the reference voltage D is outputted with the value of the voltage B as a maximum value. This voltage D is inputted to a comparing circuit 6 and is compared with the information signal A to output a binary information signal E.
JP6056580A 1980-05-09 1980-05-09 Signal procession device Granted JPS56157575A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP6056580A JPS56157575A (en) 1980-05-09 1980-05-09 Signal procession device
US06/260,090 US4420742A (en) 1980-05-09 1981-05-04 Scan signal processing system
EP81103441A EP0039899B1 (en) 1980-05-09 1981-05-06 Scan signal processing system
DE8181103441T DE3168865D1 (en) 1980-05-09 1981-05-06 Scan signal processing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6056580A JPS56157575A (en) 1980-05-09 1980-05-09 Signal procession device

Publications (2)

Publication Number Publication Date
JPS56157575A true JPS56157575A (en) 1981-12-04
JPS6339140B2 JPS6339140B2 (en) 1988-08-03

Family

ID=13145907

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6056580A Granted JPS56157575A (en) 1980-05-09 1980-05-09 Signal procession device

Country Status (1)

Country Link
JP (1) JPS56157575A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58127469A (en) * 1982-01-25 1983-07-29 Matsushita Graphic Commun Syst Inc Automatic contrast compensating circuit
JPS6096076A (en) * 1983-10-31 1985-05-29 Matsushita Electric Ind Co Ltd Device for correcting shading distortion
US5732165A (en) * 1994-04-07 1998-03-24 Fujitsu Limited White level information correction apparatus for image reading apparatus and image reading apparatus with white level information correction apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58127469A (en) * 1982-01-25 1983-07-29 Matsushita Graphic Commun Syst Inc Automatic contrast compensating circuit
JPS6340072B2 (en) * 1982-01-25 1988-08-09 Matsushita Graphic Communic
JPS6096076A (en) * 1983-10-31 1985-05-29 Matsushita Electric Ind Co Ltd Device for correcting shading distortion
US5732165A (en) * 1994-04-07 1998-03-24 Fujitsu Limited White level information correction apparatus for image reading apparatus and image reading apparatus with white level information correction apparatus

Also Published As

Publication number Publication date
JPS6339140B2 (en) 1988-08-03

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