JPS5776977A - Peproducing device for halftone picture - Google Patents

Peproducing device for halftone picture

Info

Publication number
JPS5776977A
JPS5776977A JP55152803A JP15280380A JPS5776977A JP S5776977 A JPS5776977 A JP S5776977A JP 55152803 A JP55152803 A JP 55152803A JP 15280380 A JP15280380 A JP 15280380A JP S5776977 A JPS5776977 A JP S5776977A
Authority
JP
Japan
Prior art keywords
memory
address
threshold
level
tone
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
JP55152803A
Other languages
Japanese (ja)
Inventor
Shinichi Oota
Keiichi Kawasaki
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 JP55152803A priority Critical patent/JPS5776977A/en
Publication of JPS5776977A publication Critical patent/JPS5776977A/en
Pending 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
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Color, Gradation (AREA)
  • Laser Beam Printer (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To improve the correlation between tone and average luminance, by taking the threshold level of a middle cell of a dither matrix to a low level and sequentially increasing the threshold level of surrounding cells. CONSTITUTION:The X address of a picture memory 103 is advanced one by one with every one clock of a clock generator 1 and the column address of a matrix memory 105 is advanced one by one. On the other hand, a main scanning sychronizing signal HS of a laser beam electrophotography recorder 106 advance the Y address of the memory 103 one by one and advances the row address of the memory 105 with the row counter 108 one by one. Thus, the video information of the memory 103 is compared with the threshold of the memory 105, and a recording signal is outputted to a device 106 sequentially. In this case, the threshold levels of the middle cell of the memory 105 is taken as the lowest level to make recording with improved correlativity between the tone and the average luminance.
JP55152803A 1980-10-30 1980-10-30 Peproducing device for halftone picture Pending JPS5776977A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55152803A JPS5776977A (en) 1980-10-30 1980-10-30 Peproducing device for halftone picture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55152803A JPS5776977A (en) 1980-10-30 1980-10-30 Peproducing device for halftone picture

Publications (1)

Publication Number Publication Date
JPS5776977A true JPS5776977A (en) 1982-05-14

Family

ID=15548490

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55152803A Pending JPS5776977A (en) 1980-10-30 1980-10-30 Peproducing device for halftone picture

Country Status (1)

Country Link
JP (1) JPS5776977A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5105280A (en) * 1989-01-12 1992-04-14 Minolta Camera Kabushiki Kaisha Image forming device which can form an image by printing a plurality of pixel unit areas which are composed of multiple sub pixels
US5206686A (en) * 1990-03-20 1993-04-27 Minolta Camera Kabushiki Kaisha Apparatus for forming an image with use of electrophotographic process including gradation correction
US5274424A (en) * 1991-12-16 1993-12-28 Minolta Camera Kabushiki Kaisha Image forming apparatus controlled according to smallest non-zero toner density
US5343235A (en) * 1990-03-20 1994-08-30 Minolta Camera Kabushiki Kaisha Apparatus and method for forming an image including correction for laser beam size
US5585927A (en) * 1992-05-19 1996-12-17 Minolta Camera Kabushiki Kaisha Digital image forming apparatus having gradation characteristic setting means
US6008911A (en) * 1992-05-19 1999-12-28 Minolta Co., Ltd. Digital image forming apparatus
EP2372412A1 (en) 2010-03-26 2011-10-05 Fujifilm Corporation Patterned birefringent product

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5105280A (en) * 1989-01-12 1992-04-14 Minolta Camera Kabushiki Kaisha Image forming device which can form an image by printing a plurality of pixel unit areas which are composed of multiple sub pixels
US5206686A (en) * 1990-03-20 1993-04-27 Minolta Camera Kabushiki Kaisha Apparatus for forming an image with use of electrophotographic process including gradation correction
US5343235A (en) * 1990-03-20 1994-08-30 Minolta Camera Kabushiki Kaisha Apparatus and method for forming an image including correction for laser beam size
US5274424A (en) * 1991-12-16 1993-12-28 Minolta Camera Kabushiki Kaisha Image forming apparatus controlled according to smallest non-zero toner density
US5585927A (en) * 1992-05-19 1996-12-17 Minolta Camera Kabushiki Kaisha Digital image forming apparatus having gradation characteristic setting means
US6008911A (en) * 1992-05-19 1999-12-28 Minolta Co., Ltd. Digital image forming apparatus
EP2372412A1 (en) 2010-03-26 2011-10-05 Fujifilm Corporation Patterned birefringent product

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