JPS6444751A - Image recorder - Google Patents

Image recorder

Info

Publication number
JPS6444751A
JPS6444751A JP62200981A JP20098187A JPS6444751A JP S6444751 A JPS6444751 A JP S6444751A JP 62200981 A JP62200981 A JP 62200981A JP 20098187 A JP20098187 A JP 20098187A JP S6444751 A JPS6444751 A JP S6444751A
Authority
JP
Japan
Prior art keywords
density
circuit
signal
data
converted
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
JP62200981A
Other languages
Japanese (ja)
Other versions
JP2617944B2 (en
Inventor
Yoshiro Udagawa
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 JP62200981A priority Critical patent/JP2617944B2/en
Publication of JPS6444751A publication Critical patent/JPS6444751A/en
Application granted granted Critical
Publication of JP2617944B2 publication Critical patent/JP2617944B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Color, Gradation (AREA)
  • Image Processing (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To obtain an image recorder capable of properly correcting a change in response frequency made by recording dots, by applying different filtering processings to a low density value and a high density value. CONSTITUTION:R, G, B data read by a line memory 6 is converted to a signal for density data of C, M Y by a gradation conversion circuit 7. Next, in the C, M, Y density signal the asymmetric color content of an ink in use is corrected by a masking circuit 8. This circuit 8 is executed using a table conversion ROM, which inputs the C, M, Y density signal and outputs a C', M', Y' arithmetic signal. The C', M', Y' data obtained in this manner is inputted to a highlight dither circuit 9. In this circuit 9, a dither processing is applied to represent a gradation range from a minimum density representable with minimum dots to a density 0. The C', M', Y' density data obtained in this manner is converted to voltage data for driving a head by a density-voltage conversion circuit 10.
JP62200981A 1987-08-13 1987-08-13 Image recording device Expired - Fee Related JP2617944B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62200981A JP2617944B2 (en) 1987-08-13 1987-08-13 Image recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62200981A JP2617944B2 (en) 1987-08-13 1987-08-13 Image recording device

Publications (2)

Publication Number Publication Date
JPS6444751A true JPS6444751A (en) 1989-02-17
JP2617944B2 JP2617944B2 (en) 1997-06-11

Family

ID=16433530

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62200981A Expired - Fee Related JP2617944B2 (en) 1987-08-13 1987-08-13 Image recording device

Country Status (1)

Country Link
JP (1) JP2617944B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04271570A (en) * 1990-09-27 1992-09-28 Samsung Electron Co Ltd Contour correction circuit for image
JPH0911551A (en) * 1995-06-28 1997-01-14 Nec Corp Printer
JP2007144868A (en) * 2005-11-29 2007-06-14 Seiko Epson Corp Inkjet printer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04271570A (en) * 1990-09-27 1992-09-28 Samsung Electron Co Ltd Contour correction circuit for image
JPH0911551A (en) * 1995-06-28 1997-01-14 Nec Corp Printer
JP2007144868A (en) * 2005-11-29 2007-06-14 Seiko Epson Corp Inkjet printer

Also Published As

Publication number Publication date
JP2617944B2 (en) 1997-06-11

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees