JPS56166665A - Half-tone processing system - Google Patents

Half-tone processing system

Info

Publication number
JPS56166665A
JPS56166665A JP7017080A JP7017080A JPS56166665A JP S56166665 A JPS56166665 A JP S56166665A JP 7017080 A JP7017080 A JP 7017080A JP 7017080 A JP7017080 A JP 7017080A JP S56166665 A JPS56166665 A JP S56166665A
Authority
JP
Japan
Prior art keywords
dither
matrix
signal
numericals
threshold value
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
JP7017080A
Other languages
Japanese (ja)
Other versions
JPH0117310B2 (en
Inventor
Hiromasa Isobe
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 JP7017080A priority Critical patent/JPS56166665A/en
Publication of JPS56166665A publication Critical patent/JPS56166665A/en
Publication of JPH0117310B2 publication Critical patent/JPH0117310B2/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
    • H04N1/405—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)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To facilitate the modificatin of a dither matrix with respect to a half-tone processor by a dither method, by storing respective numericals of two different dither matrixes by addressing each matrix partially in common. CONSTITUTION:In a memory (ROM)1, respective numericals of dither matrixes DM1 and DM2 differing in numerical array, for example, are stored as four-bit digital values in individual addresses while high-order addresses A are assigned in common. To the address A, an address signal (e) for modification is inputted as a ''1'' via a modification switch 2 when the switch is on. According to the ''0'' or ''1'' of the signal (e), the matrix DM1 or 2 is read. In response to clock signal CKs 1 and 2 synchronizing with the scanning of an optical sensor, a picture-element counter 3 and line counter 4 output threshold value Cij which corresponds to an original surface from the memory 1. Then, the threshold value Cij is compared 5 with an optical sensor output Xij and from an output signal Yij, a recording picture with approximate original density is obtained.
JP7017080A 1980-05-28 1980-05-28 Half-tone processing system Granted JPS56166665A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7017080A JPS56166665A (en) 1980-05-28 1980-05-28 Half-tone processing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7017080A JPS56166665A (en) 1980-05-28 1980-05-28 Half-tone processing system

Publications (2)

Publication Number Publication Date
JPS56166665A true JPS56166665A (en) 1981-12-21
JPH0117310B2 JPH0117310B2 (en) 1989-03-29

Family

ID=13423789

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7017080A Granted JPS56166665A (en) 1980-05-28 1980-05-28 Half-tone processing system

Country Status (1)

Country Link
JP (1) JPS56166665A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62216587A (en) * 1986-03-18 1987-09-24 Nec Corp Image reader
JPS62196467U (en) * 1986-05-30 1987-12-14
JPH06342469A (en) * 1994-04-11 1994-12-13 Canon Inc Image processor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5352319A (en) * 1976-10-25 1978-05-12 Toshiba Corp Character pattern memory unit
JPS53123042A (en) * 1977-04-01 1978-10-27 Fujitsu Ltd Code conversion system
JPS54144141A (en) * 1978-05-01 1979-11-10 Ricoh Co Ltd Display method for intermediate tone
JPS5510698A (en) * 1978-07-03 1980-01-25 Honeywell Inf Systems Method and device for selecting circulating tips
JPS5567273A (en) * 1978-11-15 1980-05-21 Ricoh Co Ltd Half-tone picture processing method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5352319A (en) * 1976-10-25 1978-05-12 Toshiba Corp Character pattern memory unit
JPS53123042A (en) * 1977-04-01 1978-10-27 Fujitsu Ltd Code conversion system
JPS54144141A (en) * 1978-05-01 1979-11-10 Ricoh Co Ltd Display method for intermediate tone
JPS5510698A (en) * 1978-07-03 1980-01-25 Honeywell Inf Systems Method and device for selecting circulating tips
JPS5567273A (en) * 1978-11-15 1980-05-21 Ricoh Co Ltd Half-tone picture processing method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62216587A (en) * 1986-03-18 1987-09-24 Nec Corp Image reader
JPH0577230B2 (en) * 1986-03-18 1993-10-26 Nippon Electric Co
JPS62196467U (en) * 1986-05-30 1987-12-14
JPH06342469A (en) * 1994-04-11 1994-12-13 Canon Inc Image processor

Also Published As

Publication number Publication date
JPH0117310B2 (en) 1989-03-29

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