JPS5799084A - Video quality compensation method for thinning out reduction system in facsimile transmitter/receiver - Google Patents

Video quality compensation method for thinning out reduction system in facsimile transmitter/receiver

Info

Publication number
JPS5799084A
JPS5799084A JP55175406A JP17540680A JPS5799084A JP S5799084 A JPS5799084 A JP S5799084A JP 55175406 A JP55175406 A JP 55175406A JP 17540680 A JP17540680 A JP 17540680A JP S5799084 A JPS5799084 A JP S5799084A
Authority
JP
Japan
Prior art keywords
thinning out
line data
video quality
receiver
compensation method
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
JP55175406A
Other languages
Japanese (ja)
Inventor
Katsuhiro Watai
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 JP55175406A priority Critical patent/JPS5799084A/en
Publication of JPS5799084A publication Critical patent/JPS5799084A/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)
  • Editing Of Facsimile Originals (AREA)
  • Image Processing (AREA)

Abstract

PURPOSE:To increase the recorded video quality, by operating the logical sum between an image data to be thinned out and one or both image data before and after it and taking the result of operation as one or both the image data before and after it. CONSTITUTION:An input line data S1 and a thinning out data sampling pulse signal S3 are given to the 1st delay F/F circuit 3 to generate a thinning out line data S5. Similarly, a thinning out line data S6 is generated at the 2nd delay F/F circuit 4. These thinning out line data S5 and S6 are logically summed at an OR gate 6 and converted into a line data S7. Thus, the line data S7 in OR processing is sequentially written in the buffer memory 7 with a memory write-in pulse S8.
JP55175406A 1980-12-12 1980-12-12 Video quality compensation method for thinning out reduction system in facsimile transmitter/receiver Pending JPS5799084A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55175406A JPS5799084A (en) 1980-12-12 1980-12-12 Video quality compensation method for thinning out reduction system in facsimile transmitter/receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55175406A JPS5799084A (en) 1980-12-12 1980-12-12 Video quality compensation method for thinning out reduction system in facsimile transmitter/receiver

Publications (1)

Publication Number Publication Date
JPS5799084A true JPS5799084A (en) 1982-06-19

Family

ID=15995530

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55175406A Pending JPS5799084A (en) 1980-12-12 1980-12-12 Video quality compensation method for thinning out reduction system in facsimile transmitter/receiver

Country Status (1)

Country Link
JP (1) JPS5799084A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5813066A (en) * 1981-07-17 1983-01-25 Fuji Xerox Co Ltd Picture size contracting system
JPS6174070A (en) * 1984-09-19 1986-04-16 Hitachi Ltd Line density converting system
JPS622367A (en) * 1985-06-28 1987-01-08 Hitachi Ltd Converting system for picture element number
JPS6341990A (en) * 1986-08-07 1988-02-23 Fujitsu Ltd Graphic reducing system
JPH01152868A (en) * 1987-12-10 1989-06-15 Ricoh Co Ltd Picture processor
JPH0397282U (en) * 1990-01-22 1991-10-07
JPH04127774A (en) * 1990-09-19 1992-04-28 Murata Mach Ltd Picture reducing method
JPH10161634A (en) * 1996-11-27 1998-06-19 Sharp Corp Image reducing unit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5161720A (en) * 1974-11-26 1976-05-28 Sharp Kk
JPS5292418A (en) * 1976-01-30 1977-08-03 Toshiba Corp Data conversion unit
JPS5758464A (en) * 1980-09-26 1982-04-08 Canon Inc Picture pattern converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5161720A (en) * 1974-11-26 1976-05-28 Sharp Kk
JPS5292418A (en) * 1976-01-30 1977-08-03 Toshiba Corp Data conversion unit
JPS5758464A (en) * 1980-09-26 1982-04-08 Canon Inc Picture pattern converter

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5813066A (en) * 1981-07-17 1983-01-25 Fuji Xerox Co Ltd Picture size contracting system
JPS6174070A (en) * 1984-09-19 1986-04-16 Hitachi Ltd Line density converting system
JPS622367A (en) * 1985-06-28 1987-01-08 Hitachi Ltd Converting system for picture element number
JPS6341990A (en) * 1986-08-07 1988-02-23 Fujitsu Ltd Graphic reducing system
JPH01152868A (en) * 1987-12-10 1989-06-15 Ricoh Co Ltd Picture processor
JPH0397282U (en) * 1990-01-22 1991-10-07
JPH04127774A (en) * 1990-09-19 1992-04-28 Murata Mach Ltd Picture reducing method
JPH10161634A (en) * 1996-11-27 1998-06-19 Sharp Corp Image reducing unit

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