JPS59161970A - Picture processor - Google Patents

Picture processor

Info

Publication number
JPS59161970A
JPS59161970A JP58036510A JP3651083A JPS59161970A JP S59161970 A JPS59161970 A JP S59161970A JP 58036510 A JP58036510 A JP 58036510A JP 3651083 A JP3651083 A JP 3651083A JP S59161970 A JPS59161970 A JP S59161970A
Authority
JP
Japan
Prior art keywords
signals
processing circuit
colors
color
multi
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
JP58036510A
Inventor
Shunichi Abe
Mitsuo Akiyama
Masayoshi Hayashi
Yoshinori Ikeda
Nobuo Matsuoka
Yoshinobu Mita
Tadashi Yoshida
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 JP58036510A priority Critical patent/JPS59161970A/en
Priority claimed from US06/585,602 external-priority patent/US4745466A/en
Priority claimed from DE19843408108 external-priority patent/DE3408108A1/en
Publication of JPS59161970A publication Critical patent/JPS59161970A/en
Application status is Pending legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46Colour picture communication systems
    • H04N1/56Processing of colour picture signals
    • H04N1/60Colour correction or control
    • H04N1/6027Correction or control of colour gradation or colour contrast
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/01Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40Picture signal circuits
    • H04N1/405Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4055Halftoning, 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

Abstract

PURPOSE:To reproduce at a high speed a color picture of high quality in a simple constitution by performing the multi-gradation processing in response to the digital picture signal obtained through a masking process. CONSTITUTION:Signals B, G and R underwent photoelectric conversion through CCDs 210, 220 and 230 are converted into digital signals of 8-bit by CCD drivers 240, 250 and 260 and then into signals Y, M and C which are complementary colors of B, G and R. These signals Y, M and C are sent to a masking processing circuit 150 after the shading correction (130) and gamma correction (140) to receive the proper correction of colors for printing. A UCR processing circuit 160 calculates the foundation color deletion quantity from the color corrected signals Y, M and C to obtain the black BK quantity. Then the dither processing of three different threshold values is applied to the new signals Y, M and C obtained by subtracting BK from each of colors Y, M and C through a dither processing circuit 170. Then a dinary signal underwent the modulation of pulse width is supplied to a laser modulating unit via a multi-value processing circuit 180.
JP58036510A 1983-03-06 1983-03-06 Picture processor Pending JPS59161970A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58036510A JPS59161970A (en) 1983-03-06 1983-03-06 Picture processor

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP58036510A JPS59161970A (en) 1983-03-06 1983-03-06 Picture processor
US06/585,602 US4745466A (en) 1983-03-06 1984-03-02 Digital color image processing apparatus with color masking processing unit addressed by a plurality of multi-bit color component signals using various combinations of the bits of the signals
DE19843408108 DE3408108A1 (en) 1983-03-06 1984-03-05 Image processing device
GB08405861A GB2141001B (en) 1983-03-06 1984-03-06 Digital masking for colour reproduction

Publications (1)

Publication Number Publication Date
JPS59161970A true JPS59161970A (en) 1984-09-12

Family

ID=12471822

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58036510A Pending JPS59161970A (en) 1983-03-06 1983-03-06 Picture processor

Country Status (1)

Country Link
JP (1) JPS59161970A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61223856A (en) * 1985-03-29 1986-10-04 Konishiroku Photo Ind Co Ltd Multicolored image forming device
US4858023A (en) * 1987-03-17 1989-08-15 Minolta Camera Kabushiki Kaisha Image read apparatus
JPH0321961A (en) * 1989-04-03 1991-01-30 Xerox Corp Color image processing system adjustable by operator
JPH0514562A (en) * 1991-07-02 1993-01-22 Matsushita Electric Ind Co Ltd Digital copying machine
JPH05260306A (en) * 1991-09-13 1993-10-08 Canon Inc Image processor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5639558A (en) * 1979-09-04 1981-04-15 Xerox Corp Electrophotography copying device
JPS5651742A (en) * 1979-10-03 1981-05-09 Ee D S:Kk Color separation image forming apparatus
JPS584158A (en) * 1981-07-01 1983-01-11 Canon Inc Image recording system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5639558A (en) * 1979-09-04 1981-04-15 Xerox Corp Electrophotography copying device
JPS5651742A (en) * 1979-10-03 1981-05-09 Ee D S:Kk Color separation image forming apparatus
JPS584158A (en) * 1981-07-01 1983-01-11 Canon Inc Image recording system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61223856A (en) * 1985-03-29 1986-10-04 Konishiroku Photo Ind Co Ltd Multicolored image forming device
JPH0228867B2 (en) * 1985-03-29 1990-06-26 Konishiroku Photo Ind
US4858023A (en) * 1987-03-17 1989-08-15 Minolta Camera Kabushiki Kaisha Image read apparatus
JPH0321961A (en) * 1989-04-03 1991-01-30 Xerox Corp Color image processing system adjustable by operator
JPH0514562A (en) * 1991-07-02 1993-01-22 Matsushita Electric Ind Co Ltd Digital copying machine
JPH05260306A (en) * 1991-09-13 1993-10-08 Canon Inc Image processor

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