JPS57181271A - Encoding device - Google Patents

Encoding device

Info

Publication number
JPS57181271A
JPS57181271A JP57062433A JP6243382A JPS57181271A JP S57181271 A JPS57181271 A JP S57181271A JP 57062433 A JP57062433 A JP 57062433A JP 6243382 A JP6243382 A JP 6243382A JP S57181271 A JPS57181271 A JP S57181271A
Authority
JP
Japan
Prior art keywords
encoding
image
dither
circuit
dimensional
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
JP57062433A
Other languages
Japanese (ja)
Inventor
Masaaki Takizawa
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP57062433A priority Critical patent/JPS57181271A/en
Publication of JPS57181271A publication Critical patent/JPS57181271A/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)
  • Image Processing (AREA)

Abstract

PURPOSE:To improve encoding efficiency and to reduce errors in transmission by encoding while switching the part of the dither image into a one-dimensional code and a direct code, in the encoding device of an image signal which contains a dither image. CONSTITUTION:The light and shade of an original image 4 is projected on a sensor 2 through a lens 2 and then transduced into a luminance signal. This luminance signal is compared with a value generated by a dither pattern generating circuit 1 to obtain an image signal, which is encoded by a two-dimensional encoding circuit 6 and a one-dimensional encoding circuit 7 respectively. According to the contents of a counter 11 updated by one for every scanning line, a control circuit 10 switches a switch 16 to select a one-dimensional code or two-dimensional code, which is sent out to a transmission line 14 through a memory 12 and a modem 13. A dither part detecting circuit 9 detects the thickness of an image signal and when a dither image is discriminated, the counter 11 is reset. The control circuit 10 switches the switch 16 to select the direct code of a direct encoding circuit 8.
JP57062433A 1982-04-16 1982-04-16 Encoding device Pending JPS57181271A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57062433A JPS57181271A (en) 1982-04-16 1982-04-16 Encoding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57062433A JPS57181271A (en) 1982-04-16 1982-04-16 Encoding device

Publications (1)

Publication Number Publication Date
JPS57181271A true JPS57181271A (en) 1982-11-08

Family

ID=13200038

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57062433A Pending JPS57181271A (en) 1982-04-16 1982-04-16 Encoding device

Country Status (1)

Country Link
JP (1) JPS57181271A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6180460A (en) * 1984-09-28 1986-04-24 Canon Inc Picture information processor
JPH0553365U (en) * 1991-12-17 1993-07-13 村田機械株式会社 Facsimile machine with automatic coding system discrimination function

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6180460A (en) * 1984-09-28 1986-04-24 Canon Inc Picture information processor
JPH0553365U (en) * 1991-12-17 1993-07-13 村田機械株式会社 Facsimile machine with automatic coding system discrimination function

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