JPS57185446A - Forming method of color picture - Google Patents

Forming method of color picture

Info

Publication number
JPS57185446A
JPS57185446A JP56070235A JP7023581A JPS57185446A JP S57185446 A JPS57185446 A JP S57185446A JP 56070235 A JP56070235 A JP 56070235A JP 7023581 A JP7023581 A JP 7023581A JP S57185446 A JPS57185446 A JP S57185446A
Authority
JP
Japan
Prior art keywords
color
concentration
picture
slope
thin line
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
JP56070235A
Other languages
Japanese (ja)
Other versions
JPH037112B2 (en
Inventor
Susumu Sugiura
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 JP56070235A priority Critical patent/JPS57185446A/en
Publication of JPS57185446A publication Critical patent/JPS57185446A/en
Publication of JPH037112B2 publication Critical patent/JPH037112B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Color Image Communication Systems (AREA)

Abstract

PURPOSE:To form a picture including a thin line part and the half tone with enhancement of both the image resolution and the gradation properties, by obtaining the slope of concentration of a reading picture element region with each color after giving a color separation to an original picture and then controlling the dither input according to the slope of concentration. CONSTITUTION:An original picture is separated into each color of blue, green and red respectively. The color concentration is detected for the picture element to be noticed and its peripheral comparatively large region by light detectors 31 and 32 for blue color, light detectors 41 and 42 for green color, and light detectors 51 and 52 for red color respectively. The picture outputs AD1- AD3 and concentration slopes KL1-KL3 of each color are obtained from the color concentration signal of each color. Each color concentration slope is applied to an OR circuit 44, and a concentration slope KL is obtained to decide whether the picture element to be noticed is a thin line or not. The dither input is controlled in accordance with the value of the KL. As a result, a picture including a thin line part and the half tone can be obtained with enhancement of both the image resolution and the gradation properties.
JP56070235A 1981-05-12 1981-05-12 Forming method of color picture Granted JPS57185446A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56070235A JPS57185446A (en) 1981-05-12 1981-05-12 Forming method of color picture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56070235A JPS57185446A (en) 1981-05-12 1981-05-12 Forming method of color picture

Publications (2)

Publication Number Publication Date
JPS57185446A true JPS57185446A (en) 1982-11-15
JPH037112B2 JPH037112B2 (en) 1991-01-31

Family

ID=13425696

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56070235A Granted JPS57185446A (en) 1981-05-12 1981-05-12 Forming method of color picture

Country Status (1)

Country Link
JP (1) JPS57185446A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59205872A (en) * 1983-05-10 1984-11-21 Canon Inc Method and apparatus for processing color picture
JPS59205876A (en) * 1983-05-10 1984-11-21 Canon Inc Method and apparatus for processing color picture
JPS60136478A (en) * 1983-12-26 1985-07-19 Canon Inc Picture processor
JPS611171A (en) * 1984-06-14 1986-01-07 Canon Inc Color picture processor
JPS6180955A (en) * 1984-09-28 1986-04-24 Fuji Xerox Co Ltd Color image processing method
JPS6488470A (en) * 1987-09-29 1989-04-03 Sharp Kk Copying process control method for copying machine
US4905294A (en) * 1984-10-19 1990-02-27 Canon Kabushiki Kaisha Image processing apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5530222A (en) * 1978-08-25 1980-03-04 Toshiba Corp Color-television pickup unit
JPS5558668A (en) * 1978-10-25 1980-05-01 Ricoh Co Ltd Picture signal processing system
JPS5566174A (en) * 1978-11-13 1980-05-19 Ricoh Co Ltd Reproducer of gradation picture
JPS5580958A (en) * 1978-12-15 1980-06-18 Toshiba Corp Picture signal binary coding system
JPS55150667A (en) * 1979-05-14 1980-11-22 Hitachi Ltd Picture signal quantizing system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5530222A (en) * 1978-08-25 1980-03-04 Toshiba Corp Color-television pickup unit
JPS5558668A (en) * 1978-10-25 1980-05-01 Ricoh Co Ltd Picture signal processing system
JPS5566174A (en) * 1978-11-13 1980-05-19 Ricoh Co Ltd Reproducer of gradation picture
JPS5580958A (en) * 1978-12-15 1980-06-18 Toshiba Corp Picture signal binary coding system
JPS55150667A (en) * 1979-05-14 1980-11-22 Hitachi Ltd Picture signal quantizing system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59205872A (en) * 1983-05-10 1984-11-21 Canon Inc Method and apparatus for processing color picture
JPS59205876A (en) * 1983-05-10 1984-11-21 Canon Inc Method and apparatus for processing color picture
JPH0515105B2 (en) * 1983-05-10 1993-02-26 Canon Kk
JPS60136478A (en) * 1983-12-26 1985-07-19 Canon Inc Picture processor
JPH0550187B2 (en) * 1983-12-26 1993-07-28 Canon Kk
JPS611171A (en) * 1984-06-14 1986-01-07 Canon Inc Color picture processor
JPS6180955A (en) * 1984-09-28 1986-04-24 Fuji Xerox Co Ltd Color image processing method
US4905294A (en) * 1984-10-19 1990-02-27 Canon Kabushiki Kaisha Image processing apparatus
JPS6488470A (en) * 1987-09-29 1989-04-03 Sharp Kk Copying process control method for copying machine

Also Published As

Publication number Publication date
JPH037112B2 (en) 1991-01-31

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