JPS5616374A - Coding system for variable density still picture signal - Google Patents

Coding system for variable density still picture signal

Info

Publication number
JPS5616374A
JPS5616374A JP9225779A JP9225779A JPS5616374A JP S5616374 A JPS5616374 A JP S5616374A JP 9225779 A JP9225779 A JP 9225779A JP 9225779 A JP9225779 A JP 9225779A JP S5616374 A JPS5616374 A JP S5616374A
Authority
JP
Japan
Prior art keywords
coded
mean
picture
density
densities
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
JP9225779A
Other languages
Japanese (ja)
Other versions
JPS6128263B2 (en
Inventor
Sumio Mori
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP9225779A priority Critical patent/JPS5616374A/en
Publication of JPS5616374A publication Critical patent/JPS5616374A/en
Publication of JPS6128263B2 publication Critical patent/JPS6128263B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
    • H04N19/98—Adaptive-dynamic-range coding [ADRC]

Landscapes

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

Abstract

PURPOSE:To secure a high-efficiency transmission and storage for the picture signals of the photograph or the like, by securing a proper adaptive coding according to the picture state of each block by setting the threshold level to a proper value. CONSTITUTION:Arithmetic circuit 2 calculates mean density -x of the mXn picture element in one block. Based on the density -x, comparison 3 is given among the densities of each picture element. Then arithmetic circuits 7 and 8 calculate the mean densities V and W for the picture elements belonging to the groups the density value xij of which is larger and smaller than -x each. These mean densities are then coded with 8 bits to be delivered (b) and (c) each. On the other hand, arithmetic circuits 10 and 11 calculate the mean values Q and R of the absolute value of deviation of V and W each, and the outputs (d) and (e) are coded with 4 bits. Then the threshold level is set epsilon1 and epsilon0 to Q and R respectively as the reference value of each level. And the level relation F between Q/R and epsilon1/epsilon0 is coded with the 2-bit code length and based on the specified relative formula, and then an adaptive coding is given to the bit train.
JP9225779A 1979-07-20 1979-07-20 Coding system for variable density still picture signal Granted JPS5616374A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9225779A JPS5616374A (en) 1979-07-20 1979-07-20 Coding system for variable density still picture signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9225779A JPS5616374A (en) 1979-07-20 1979-07-20 Coding system for variable density still picture signal

Publications (2)

Publication Number Publication Date
JPS5616374A true JPS5616374A (en) 1981-02-17
JPS6128263B2 JPS6128263B2 (en) 1986-06-30

Family

ID=14049356

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9225779A Granted JPS5616374A (en) 1979-07-20 1979-07-20 Coding system for variable density still picture signal

Country Status (1)

Country Link
JP (1) JPS5616374A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60181659U (en) * 1984-03-22 1985-12-02 トピ−工業株式会社 Disc wheel inspection equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60181659U (en) * 1984-03-22 1985-12-02 トピ−工業株式会社 Disc wheel inspection equipment
JPH0330845Y2 (en) * 1984-03-22 1991-06-28

Also Published As

Publication number Publication date
JPS6128263B2 (en) 1986-06-30

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