JPS5698078A - Image reproducer - Google Patents

Image reproducer

Info

Publication number
JPS5698078A
JPS5698078A JP17354479A JP17354479A JPS5698078A JP S5698078 A JPS5698078 A JP S5698078A JP 17354479 A JP17354479 A JP 17354479A JP 17354479 A JP17354479 A JP 17354479A JP S5698078 A JPS5698078 A JP S5698078A
Authority
JP
Japan
Prior art keywords
signal
supplied
delivered
conversion
converter
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
JP17354479A
Other languages
Japanese (ja)
Other versions
JPH0127628B2 (en
Inventor
Yutaka Komiya
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP17354479A priority Critical patent/JPS5698078A/en
Priority to GB8041374A priority patent/GB2069793B/en
Priority to DE19803049369 priority patent/DE3049369A1/en
Publication of JPS5698078A publication Critical patent/JPS5698078A/en
Priority to GB08400010A priority patent/GB2140646B/en
Priority to US07/224,257 priority patent/US4812910A/en
Publication of JPH0127628B2 publication Critical patent/JPH0127628B2/ja
Granted 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
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • H04N1/4076—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Facsimiles In General (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To realize a reproduction for the intermediate gradation of an original, by giving an A/D conversion to the read signal of the original image and then delivering a reproduction signal in accordance with both a conversion signal and a prescribed band value array signal. CONSTITUTION:First the dummy scan equivalent to a line of CCD is carried out, and the reference black level signal BL-RF and the reference white level signal WT-RF delivered from the port VIDEO are held at the S/H circuits 101 and 101' each. These reference outputs are supplied to the A/D converter 102's reference voltage ports 7 and 9. With start of the scan, the reading data is supplied to 6. The converter gives an A/D conversion to the 8-bit level between the black and white levels. The converter 102 has 8 comparators, and the reference input is given through the internal network between 7 and 8 to be delivered as it is. This parallel output is supplied to each input port of the data selector 103, and the data is controlled selectively by the 3-bit control signal supplied to the ports A0-A2. Then the band value for selective control is varied in accordance with the contents of the 3-bit code, and then delivered adding a weight.
JP17354479A 1979-12-29 1979-12-29 Image reproducer Granted JPS5698078A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP17354479A JPS5698078A (en) 1979-12-29 1979-12-29 Image reproducer
GB8041374A GB2069793B (en) 1979-12-29 1980-12-29 Half-tone facsimile
DE19803049369 DE3049369A1 (en) 1979-12-29 1980-12-29 IMAGE REPRODUCTION DEVICE
GB08400010A GB2140646B (en) 1979-12-29 1984-01-03 Image reproducing equipment
US07/224,257 US4812910A (en) 1979-12-29 1988-07-26 Image reproducing equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17354479A JPS5698078A (en) 1979-12-29 1979-12-29 Image reproducer

Publications (2)

Publication Number Publication Date
JPS5698078A true JPS5698078A (en) 1981-08-07
JPH0127628B2 JPH0127628B2 (en) 1989-05-30

Family

ID=15962492

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17354479A Granted JPS5698078A (en) 1979-12-29 1979-12-29 Image reproducer

Country Status (1)

Country Link
JP (1) JPS5698078A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02238775A (en) * 1989-03-13 1990-09-21 Ricoh Co Ltd Original scanner

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51114133A (en) * 1975-03-14 1976-10-07 Xerox Corp Method of and apparatus for half tone duplication

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51114133A (en) * 1975-03-14 1976-10-07 Xerox Corp Method of and apparatus for half tone duplication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02238775A (en) * 1989-03-13 1990-09-21 Ricoh Co Ltd Original scanner

Also Published As

Publication number Publication date
JPH0127628B2 (en) 1989-05-30

Similar Documents

Publication Publication Date Title
JPS6485631A (en) Electronic endoscopic apparatus
US4789892A (en) Color adjusting device including matrix-masking circuitry
JPS55112076A (en) Predictive restoration method for high-density picture element
JPS54148317A (en) Special effect device
AU1173983A (en) Digital video non-linear transduction
ATE75571T1 (en) SYSTEM FOR GENERATION OF DIVERTER IMAGES FROM CONTINUOUS TONE IMAGE DATA.
JPS561666A (en) Gamma correcting system for picture input/output device
JPS5698078A (en) Image reproducer
JPS5739977A (en) Heat-sensitive multi-tone recorder
JPS5523653A (en) Reproducing method of intermediate tone
JPS5574545A (en) Television image engraving device
JPS56125160A (en) Picture display system
JPS5412620A (en) Picture information transmission recording system
JPS561667A (en) Gamma correcting system for picture input/output device
JPS54146530A (en) Binary coding circuit
JPS55166377A (en) Reading device for double-color original
JPS54116833A (en) Liquid crystal driver circuit
SU830657A1 (en) Device for reproducing half-tone images
JPS648046A (en) Image forming device
KR930001399Y1 (en) Interim processing circuit
JPS5623073A (en) Half tone recorder
JPS57170667A (en) Original reading device
JPS561697A (en) Mixing process circuit for digital signal
EP0184448A3 (en) Digital scan converters
JPS5578669A (en) Predictive reloading device for picture signal