JPS55138974A - Image processing method - Google Patents

Image processing method

Info

Publication number
JPS55138974A
JPS55138974A JP4707179A JP4707179A JPS55138974A JP S55138974 A JPS55138974 A JP S55138974A JP 4707179 A JP4707179 A JP 4707179A JP 4707179 A JP4707179 A JP 4707179A JP S55138974 A JPS55138974 A JP S55138974A
Authority
JP
Japan
Prior art keywords
picture element
image
density level
low gradation
signal
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
JP4707179A
Other languages
Japanese (ja)
Other versions
JPS6031383B2 (en
Inventor
Keiji Sekikawa
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 JP54047071A priority Critical patent/JPS6031383B2/en
Priority to US06/139,395 priority patent/US4349846A/en
Priority to DE19803014884 priority patent/DE3014884A1/en
Publication of JPS55138974A publication Critical patent/JPS55138974A/en
Publication of JPS6031383B2 publication Critical patent/JPS6031383B2/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
    • H04N1/4051—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size

Landscapes

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

Abstract

PURPOSE:To restore an image of high quality from a low gradation sampling signal, by predicting a density level of a remarkable picture element in the specific picture element area by a density level of each picture element around the former. CONSTITUTION:The image input side A scans an image and performs a low gradation sampling for the density information of each picture element by use of a quantizer 1. Each smapling signal is encoded by an encoder 2 and is transmitted to the output side B. The output side B decodes the encoded signal which has been received by a decoder 3, stores the contents in the memory 4, and makes it store a density level of each picture element in the specific picture element area. Based upon the contents which have been stored, a density level of a remarkable picture element is predicted by the arithmetic unit 5. A specific threshold pattern is called from ROM6, it is compared with a predictive level by the comparator 7, and white or black is decided. Thus, the low gradation sampling signal is able to restore an image of high quality.
JP54047071A 1979-04-17 1979-04-17 Image processing method Expired JPS6031383B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP54047071A JPS6031383B2 (en) 1979-04-17 1979-04-17 Image processing method
US06/139,395 US4349846A (en) 1979-04-17 1980-04-11 Picture processing method
DE19803014884 DE3014884A1 (en) 1979-04-17 1980-04-17 IMAGE PROCESSING PROCESS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54047071A JPS6031383B2 (en) 1979-04-17 1979-04-17 Image processing method

Publications (2)

Publication Number Publication Date
JPS55138974A true JPS55138974A (en) 1980-10-30
JPS6031383B2 JPS6031383B2 (en) 1985-07-22

Family

ID=12764925

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54047071A Expired JPS6031383B2 (en) 1979-04-17 1979-04-17 Image processing method

Country Status (1)

Country Link
JP (1) JPS6031383B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6167370A (en) * 1984-09-11 1986-04-07 Oki Electric Ind Co Ltd Gradation picture coding and decoding method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6167370A (en) * 1984-09-11 1986-04-07 Oki Electric Ind Co Ltd Gradation picture coding and decoding method

Also Published As

Publication number Publication date
JPS6031383B2 (en) 1985-07-22

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