JPS57161981A - White level follower circuit - Google Patents

White level follower circuit

Info

Publication number
JPS57161981A
JPS57161981A JP56046372A JP4637281A JPS57161981A JP S57161981 A JPS57161981 A JP S57161981A JP 56046372 A JP56046372 A JP 56046372A JP 4637281 A JP4637281 A JP 4637281A JP S57161981 A JPS57161981 A JP S57161981A
Authority
JP
Japan
Prior art keywords
given
circuit
maximum value
initial value
coefficient
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
JP56046372A
Other languages
Japanese (ja)
Inventor
Norio Kanemitsu
Yasuhiko Yogoshi
Shiyouji Takahashi
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56046372A priority Critical patent/JPS57161981A/en
Publication of JPS57161981A publication Critical patent/JPS57161981A/en
Pending 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)
  • Character Input (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To achieve accurate binary signals, by taking a coefficient preset according to the location and length of the initial value set area as a reference potential after converting to a maximum value, in a white level follower circuit. CONSTITUTION:A maximum value within a section of a signal Si obtained through the amplification of an output of an image sensor is detected at a maximum value circuit 35 and stored 58 via an MPX57. An initial value forming conversion circuit 56(ROM) selects a coefficient corresponding to a level value out of coefficients given in advance, the coefficient is multiplied with an output of a memory 58 and the result is stored via the MPX57, a gate 59 is opened with an MPU (not shown), the result is D/A-converted 60 and given to an A/D converter 51. This analog signal level is divided at resistors r1-r15 and given to comparators C1-C15, compared with the input signal Si and given to a terminal 6 as a binary signal S0 via an encoder 52. Thus, a circuit enabling sure A/D conversion can be obtained by setting a suitable reference initial value at each section.
JP56046372A 1981-03-31 1981-03-31 White level follower circuit Pending JPS57161981A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56046372A JPS57161981A (en) 1981-03-31 1981-03-31 White level follower circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56046372A JPS57161981A (en) 1981-03-31 1981-03-31 White level follower circuit

Publications (1)

Publication Number Publication Date
JPS57161981A true JPS57161981A (en) 1982-10-05

Family

ID=12745312

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56046372A Pending JPS57161981A (en) 1981-03-31 1981-03-31 White level follower circuit

Country Status (1)

Country Link
JP (1) JPS57161981A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6061861U (en) * 1983-10-03 1985-04-30 株式会社ピーエフユー image reader
JPS61126671U (en) * 1985-01-24 1986-08-08

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6061861U (en) * 1983-10-03 1985-04-30 株式会社ピーエフユー image reader
JPS61126671U (en) * 1985-01-24 1986-08-08

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