GB1206681A - Electronic reproduction of continuous image by half tone dots - Google Patents

Electronic reproduction of continuous image by half tone dots

Info

Publication number
GB1206681A
GB1206681A GB1078168A GB1078168A GB1206681A GB 1206681 A GB1206681 A GB 1206681A GB 1078168 A GB1078168 A GB 1078168A GB 1078168 A GB1078168 A GB 1078168A GB 1206681 A GB1206681 A GB 1206681A
Authority
GB
United Kingdom
Prior art keywords
signal
image
area
centre
scanner
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.)
Expired
Application number
GB1078168A
Other languages
English (en)
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.)
Printing Developments Inc
Original Assignee
Printing Developments 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 Printing Developments Inc filed Critical Printing Developments Inc
Publication of GB1206681A publication Critical patent/GB1206681A/en
Expired 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)
  • Facsimile Scanning Arrangements (AREA)
GB1078168A 1967-03-22 1968-03-06 Electronic reproduction of continuous image by half tone dots Expired GB1206681A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US62503867A 1967-03-22 1967-03-22

Publications (1)

Publication Number Publication Date
GB1206681A true GB1206681A (en) 1970-09-30

Family

ID=24504320

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1078168A Expired GB1206681A (en) 1967-03-22 1968-03-06 Electronic reproduction of continuous image by half tone dots

Country Status (7)

Country Link
CH (1) CH486322A (da)
DE (1) DE1772022C3 (da)
DK (1) DK145136C (da)
FR (1) FR1605174A (da)
GB (1) GB1206681A (da)
NL (1) NL152670B (da)
SE (1) SE326892B (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189752A (en) * 1973-11-12 1980-02-19 Printing Developments, Inc. Electronic screening with galvanometer recorders
US4409614A (en) 1978-10-10 1983-10-11 Helmut Eichler Method for the reproduction of originals which, with respect to their color content, are scanned according to a tristimulus method
GB2151101A (en) * 1983-11-01 1985-07-10 Canon Kk Image processing apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983319A (en) * 1973-11-12 1976-09-28 Printing Developments, Inc. Electronic screening for image reproduction
FR2467078A1 (fr) * 1979-10-11 1981-04-17 Machulka Grigory Dispositif a laser pour la fabrication des formes d'impression
EP0077410B1 (de) * 1981-10-19 1987-02-04 DR.-ING. RUDOLF HELL GmbH Verfahren zur Verbesserung der Kontrastanhebung
DE4038057C2 (de) * 1990-11-29 1997-05-15 Hell Ag Linotype Verfahren zur Generierung und Speicherung von digitalisierten Dichteschwellwerten zur Rasterung einer Halbtonbildvorlage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189752A (en) * 1973-11-12 1980-02-19 Printing Developments, Inc. Electronic screening with galvanometer recorders
US4409614A (en) 1978-10-10 1983-10-11 Helmut Eichler Method for the reproduction of originals which, with respect to their color content, are scanned according to a tristimulus method
GB2151101A (en) * 1983-11-01 1985-07-10 Canon Kk Image processing apparatus
US4701808A (en) * 1983-11-01 1987-10-20 Canon Kabushiki Kaisha Image processing apparatus with variable magnification and gray level processing

Also Published As

Publication number Publication date
FR1605174A (da) 1973-04-16
DE1772022B2 (da) 1975-03-06
DE1772022A1 (de) 1970-08-06
DK145136C (da) 1983-03-28
CH486322A (de) 1970-02-28
DE1772022C3 (de) 1975-10-16
DK145136B (da) 1982-09-13
NL6804028A (da) 1968-09-23
SE326892B (da) 1970-08-03
NL152670B (nl) 1977-03-15

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee