JPS5566174A - Reproducer of gradation picture - Google Patents

Reproducer of gradation picture

Info

Publication number
JPS5566174A
JPS5566174A JP13971278A JP13971278A JPS5566174A JP S5566174 A JPS5566174 A JP S5566174A JP 13971278 A JP13971278 A JP 13971278A JP 13971278 A JP13971278 A JP 13971278A JP S5566174 A JPS5566174 A JP S5566174A
Authority
JP
Japan
Prior art keywords
picture
gradation
signal
output
generator
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
JP13971278A
Other languages
Japanese (ja)
Other versions
JPS6348225B2 (en
Inventor
Koichi Ejiri
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP13971278A priority Critical patent/JPS5566174A/en
Publication of JPS5566174A publication Critical patent/JPS5566174A/en
Publication of JPS6348225B2 publication Critical patent/JPS6348225B2/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
    • H04N1/40062—Discrimination between different image types, e.g. two-tone, continuous tone

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Image Analysis (AREA)

Abstract

PURPOSE:To secure the faithful reproduction for the picture in which both the line drawing and the photo coexist by deciding the types of the pictures according to the frequency distribution based on the density level of the picture element of the picture and then generating the proper output based on the decision result. CONSTITUTION:Picture signal Vi is separated through multi-value quantizer 8 into levels L1-Ln and then memorized temporarily in buffer memory 9. The contents of the separation are added via memory 9 and adder 10 and with every density level, and this result is memorized in random access memory 11. The contents of this memory shows the frequency distribution, based on which logic desicion unit 12 decides the linear pattern or the gradation pattern. And in the case of the linear pattern, controller 13 sets the threshold level of selection gate 14 to the value near Lm and sets the levels higher than Lm as the black. At the same time, the output of gradation signal generator is defined as the white. In the case of the gradation pattern, and threshold level of gate 14 is set near Ln with the levels higher than Ln is set as the black. And the gradation signal is generated from generator 15. Both the binary output of gate 14 and the gradation signal of generator 15 are supplied to operator 16 for processing and then sent to the plotter in the form of output signal Vo.
JP13971278A 1978-11-13 1978-11-13 Reproducer of gradation picture Granted JPS5566174A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13971278A JPS5566174A (en) 1978-11-13 1978-11-13 Reproducer of gradation picture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13971278A JPS5566174A (en) 1978-11-13 1978-11-13 Reproducer of gradation picture

Publications (2)

Publication Number Publication Date
JPS5566174A true JPS5566174A (en) 1980-05-19
JPS6348225B2 JPS6348225B2 (en) 1988-09-28

Family

ID=15251654

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13971278A Granted JPS5566174A (en) 1978-11-13 1978-11-13 Reproducer of gradation picture

Country Status (1)

Country Link
JP (1) JPS5566174A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725771A (en) * 1980-07-23 1982-02-10 Canon Inc Picture signal processor
JPS5778277A (en) * 1980-10-31 1982-05-15 Ricoh Co Ltd Video coding method
JPS57115074A (en) * 1981-01-08 1982-07-17 Ricoh Co Ltd Method for discriminating halftone picture region
JPS57147373A (en) * 1981-03-06 1982-09-11 Canon Inc Digital picture reproducer
JPS57159173A (en) * 1981-03-26 1982-10-01 Canon Inc Image processor
JPS57185446A (en) * 1981-05-12 1982-11-15 Canon Inc Forming method of color picture
JPS5810961A (en) * 1981-07-13 1983-01-21 Canon Inc Binary coding method for picture
JPS58215882A (en) * 1982-06-07 1983-12-15 インタ−ナシヨナル　ビジネス　マシ−ンズ　コ−ポレ−シヨン Document sorting method
EP0195925A2 (en) 1985-03-29 1986-10-01 International Business Machines Corporation Method for converting image gray levels
US4663662A (en) * 1982-11-30 1987-05-05 Tokyo Shibaura Denki Kabushiki Kaisha Picture signal processing system featuring simple or dithering binarization processing selected in response to local variations in picture density
US4853795A (en) * 1987-07-24 1989-08-01 Eastman Kodak Company Forward look ahead techniques for tracking background and noise levels in scanned video images
US4982294A (en) * 1987-07-24 1991-01-01 Eastman Kodak Company Apparatus for enhancing and thresholding scanned microfilm images and methods for use therein

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102007241B1 (en) * 2018-11-08 2019-08-06 한국전력공사 System and method for gas analysis value correction of the standard insulating oil

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4882713A (en) * 1972-02-07 1973-11-05
JPS50140209A (en) * 1974-04-26 1975-11-10
JPS51147909A (en) * 1975-06-13 1976-12-18 Omron Tateisi Electronics Co Facsimile system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4882713A (en) * 1972-02-07 1973-11-05
JPS50140209A (en) * 1974-04-26 1975-11-10
JPS51147909A (en) * 1975-06-13 1976-12-18 Omron Tateisi Electronics Co Facsimile system

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725771A (en) * 1980-07-23 1982-02-10 Canon Inc Picture signal processor
JPS5778277A (en) * 1980-10-31 1982-05-15 Ricoh Co Ltd Video coding method
JPS57115074A (en) * 1981-01-08 1982-07-17 Ricoh Co Ltd Method for discriminating halftone picture region
JPH0381345B2 (en) * 1981-01-08 1991-12-27 Ricoh Kk
JPH046302B2 (en) * 1981-03-06 1992-02-05 Canon Kk
JPS57147373A (en) * 1981-03-06 1982-09-11 Canon Inc Digital picture reproducer
JPS57159173A (en) * 1981-03-26 1982-10-01 Canon Inc Image processor
JPH039676B2 (en) * 1981-03-26 1991-02-08 Canon Kk
JPS57185446A (en) * 1981-05-12 1982-11-15 Canon Inc Forming method of color picture
JPH037112B2 (en) * 1981-05-12 1991-01-31 Canon Kk
JPS5810961A (en) * 1981-07-13 1983-01-21 Canon Inc Binary coding method for picture
JPH0251310B2 (en) * 1982-06-07 1990-11-07 Intaanashonaru Bijinesu Mashiinzu Corp
JPS58215882A (en) * 1982-06-07 1983-12-15 インタ−ナシヨナル　ビジネス　マシ−ンズ　コ−ポレ−シヨン Document sorting method
US4663662A (en) * 1982-11-30 1987-05-05 Tokyo Shibaura Denki Kabushiki Kaisha Picture signal processing system featuring simple or dithering binarization processing selected in response to local variations in picture density
EP0195925A2 (en) 1985-03-29 1986-10-01 International Business Machines Corporation Method for converting image gray levels
US4982294A (en) * 1987-07-24 1991-01-01 Eastman Kodak Company Apparatus for enhancing and thresholding scanned microfilm images and methods for use therein
US4853795A (en) * 1987-07-24 1989-08-01 Eastman Kodak Company Forward look ahead techniques for tracking background and noise levels in scanned video images

Also Published As

Publication number Publication date
JPS6348225B2 (en) 1988-09-28

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