JPS57148472A - Method for extracting half-tone picture area - Google Patents

Method for extracting half-tone picture area

Info

Publication number
JPS57148472A
JPS57148472A JP56034227A JP3422781A JPS57148472A JP S57148472 A JPS57148472 A JP S57148472A JP 56034227 A JP56034227 A JP 56034227A JP 3422781 A JP3422781 A JP 3422781A JP S57148472 A JPS57148472 A JP S57148472A
Authority
JP
Japan
Prior art keywords
picture
areas
memory
multilevel
pictures
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
JP56034227A
Other languages
Japanese (ja)
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 JP56034227A priority Critical patent/JPS57148472A/en
Publication of JPS57148472A publication Critical patent/JPS57148472A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Editing Of Facsimile Originals (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To extract multilevel picture areas as half-tone picture areas, by dividing multilevel pictures into small areas and by stubbing dither picture areas by connecting areas which are discriminated as parts of picture and by referring to the threshold level used for making dither. CONSTITUTION:Dithered pictures of multilevel pictures are stored in an image memory 100, and the same dither matrix is stored in a table circuit 106. Then, data of samll areas of 16X16 picture elements of the dither picture in the memory 100 are extracted into a buffer memory 102, and the small areas are discriminated whether they are parts of the picture or not at a picture discriminating circuit 103. The results are written in corresponding bits of a structure file memory 104. Then, a structure file S is produced in the structure file memory 104. Thereafter, a processor 105 performs stubbing of areas by referring to the structure file, and extracts the area of multilevel pictures corresponding to the stubbed area as the half-tone picture area by referring to the memory 100 and circuit 106.
JP56034227A 1981-03-10 1981-03-10 Method for extracting half-tone picture area Pending JPS57148472A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56034227A JPS57148472A (en) 1981-03-10 1981-03-10 Method for extracting half-tone picture area

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56034227A JPS57148472A (en) 1981-03-10 1981-03-10 Method for extracting half-tone picture area

Publications (1)

Publication Number Publication Date
JPS57148472A true JPS57148472A (en) 1982-09-13

Family

ID=12408254

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56034227A Pending JPS57148472A (en) 1981-03-10 1981-03-10 Method for extracting half-tone picture area

Country Status (1)

Country Link
JP (1) JPS57148472A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10461697B2 (en) 2014-08-29 2019-10-29 Murata Manufacturing Co., Ltd. Oscillation circuit and oscillation-circuit driving method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10461697B2 (en) 2014-08-29 2019-10-29 Murata Manufacturing Co., Ltd. Oscillation circuit and oscillation-circuit driving method

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