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JPS55124363A - Predicting restoration method for picture signal - Google Patents

Predicting restoration method for picture signal

Info

Publication number
JPS55124363A
JPS55124363A JP3243979A JP3243979A JPS55124363A JP S55124363 A JPS55124363 A JP S55124363A JP 3243979 A JP3243979 A JP 3243979A JP 3243979 A JP3243979 A JP 3243979A JP S55124363 A JPS55124363 A JP S55124363A
Authority
JP
Japan
Prior art keywords
picture
density
minor
picture element
levels
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
JP3243979A
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 JP3243979A priority Critical patent/JPS55124363A/en
Publication of JPS55124363A publication Critical patent/JPS55124363A/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
    • H04N1/41—Bandwidth or redundancy reduction

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To ensure the picture restoration to the high picture element density by deciding the white/black levels through the comparison between the density of the minor picture element and each element of the threshold level matrix set previously after setting the density of all minor picture elements equal to the original picture element density. CONSTITUTION:One picture element A of the reading picture element is divided into four minor picture elements, and the density of minor picture elements Sij are all set equal to original picture element density A. Then the value of each element of threshold level matrix T=tij set previously is subtracted from density A of element Sij. As a result, only the minor picture elements in which A-t11, A-t12, A-t21 and A-t22 become positive are decided as the black levels and others as the white levels finally. Thus the binary coding is given to each minor picture element with the black and white levels set to 1 and 0 each. In such way, the simple restoration can be given to the picture requiring the intermediate gradation with the high picture quality.
JP3243979A 1979-03-20 1979-03-20 Predicting restoration method for picture signal Pending JPS55124363A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3243979A JPS55124363A (en) 1979-03-20 1979-03-20 Predicting restoration method for picture signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3243979A JPS55124363A (en) 1979-03-20 1979-03-20 Predicting restoration method for picture signal

Publications (1)

Publication Number Publication Date
JPS55124363A true JPS55124363A (en) 1980-09-25

Family

ID=12358982

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3243979A Pending JPS55124363A (en) 1979-03-20 1979-03-20 Predicting restoration method for picture signal

Country Status (1)

Country Link
JP (1) JPS55124363A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4870497A (en) * 1988-01-22 1989-09-26 American Telephone And Telegraph Company Progressive transmission of high resolution two-tone facsimile images
US4873577A (en) * 1988-01-22 1989-10-10 American Telephone And Telegraph Company Edge decomposition for the transmission of high resolution facsimile images

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4870497A (en) * 1988-01-22 1989-09-26 American Telephone And Telegraph Company Progressive transmission of high resolution two-tone facsimile images
US4873577A (en) * 1988-01-22 1989-10-10 American Telephone And Telegraph Company Edge decomposition for the transmission of high resolution facsimile images

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