FR1372703A - Circuit automatique de contraste - Google Patents

Circuit automatique de contraste

Info

Publication number
FR1372703A
FR1372703A FR945527A FR945527A FR1372703A FR 1372703 A FR1372703 A FR 1372703A FR 945527 A FR945527 A FR 945527A FR 945527 A FR945527 A FR 945527A FR 1372703 A FR1372703 A FR 1372703A
Authority
FR
France
Prior art keywords
automatic contrast
contrast circuit
circuit
automatic
contrast
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.)
Expired
Application number
FR945527A
Other languages
English (en)
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.)
Sperry Corp
Original Assignee
Sperry Rand 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
Priority claimed from US222002A external-priority patent/US3181007A/en
Application filed by Sperry Rand Corp filed Critical Sperry Rand Corp
Priority to FR945527A priority Critical patent/FR1372703A/fr
Application granted granted Critical
Publication of FR1372703A publication Critical patent/FR1372703A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/003—Changing the DC level
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
    • G06V30/10—Character recognition
    • G06V30/16—Image preprocessing
    • G06V30/162—Quantising the image signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/01—Shaping pulses
    • H03K5/12—Shaping pulses by steepening leading or trailing edges
    • 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
    • H04N1/40087—Multi-toning, i.e. converting a continuous-tone signal for reproduction with more than two discrete brightnesses or optical densities, e.g. dots of grey and black inks on white paper
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/205—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic
    • H04N5/208—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
    • G06V30/10—Character recognition

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Discrete Mathematics (AREA)
FR945527A 1962-09-07 1963-08-23 Circuit automatique de contraste Expired FR1372703A (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR945527A FR1372703A (fr) 1962-09-07 1963-08-23 Circuit automatique de contraste

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US222002A US3181007A (en) 1962-09-07 1962-09-07 Automatic contrast circuit employing two cascaded difference amplifiers for changing slope of information signal
FR945527A FR1372703A (fr) 1962-09-07 1963-08-23 Circuit automatique de contraste

Publications (1)

Publication Number Publication Date
FR1372703A true FR1372703A (fr) 1964-09-18

Family

ID=26203018

Family Applications (1)

Application Number Title Priority Date Filing Date
FR945527A Expired FR1372703A (fr) 1962-09-07 1963-08-23 Circuit automatique de contraste

Country Status (1)

Country Link
FR (1) FR1372703A (fr)

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