JPS56101276A - Signal processing system for contrast picture - Google Patents

Signal processing system for contrast picture

Info

Publication number
JPS56101276A
JPS56101276A JP426480A JP426480A JPS56101276A JP S56101276 A JPS56101276 A JP S56101276A JP 426480 A JP426480 A JP 426480A JP 426480 A JP426480 A JP 426480A JP S56101276 A JPS56101276 A JP S56101276A
Authority
JP
Japan
Prior art keywords
bit
tone
signal
tone correction
selector
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
JP426480A
Other languages
Japanese (ja)
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 JP426480A priority Critical patent/JPS56101276A/en
Publication of JPS56101276A publication Critical patent/JPS56101276A/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
    • H04N1/40—Picture signal circuits
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • H04N1/4072—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on the contents of the original

Landscapes

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

Abstract

PURPOSE:To reproduce an intermediate tone of good quality, by visually removing the quantized distortion with a simple method, through correction of a tonous level signal in m-bit to be output according to the rate of a quantized error. CONSTITUTION:The input signal Xi of one video element n-bit is sectioned into m-bit and (n-m)-bit from the most significant bit in n-bit at a tone divider 1. The quantized error le indicated with (n-m)-bit is input to selector 2. The selector 2 outputs the address la to tone correction table 3 and feeds control signal lc to a random number generator 4. The generator 4 outputs the address lb of tone correction value to be selected by generating uniform random number. The table 3 reads out the tone correction value from the addresses la and lb and feeds it to the adder 6 as the tone correction signal l1. The output video signal Yi having the tone level in m-bit is obtained by adding the tone level signal lm and signal l1 from the divider 1 stored in the buffer register 5.
JP426480A 1980-01-17 1980-01-17 Signal processing system for contrast picture Pending JPS56101276A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP426480A JPS56101276A (en) 1980-01-17 1980-01-17 Signal processing system for contrast picture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP426480A JPS56101276A (en) 1980-01-17 1980-01-17 Signal processing system for contrast picture

Publications (1)

Publication Number Publication Date
JPS56101276A true JPS56101276A (en) 1981-08-13

Family

ID=11579672

Family Applications (1)

Application Number Title Priority Date Filing Date
JP426480A Pending JPS56101276A (en) 1980-01-17 1980-01-17 Signal processing system for contrast picture

Country Status (1)

Country Link
JP (1) JPS56101276A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5896459A (en) * 1981-12-04 1983-06-08 Matsushita Electric Ind Co Ltd Quantizing method for picture luminance signal
JPS61126593A (en) * 1984-11-26 1986-06-14 仲井　久雄 Color shading method and apparatus by gray level random number interpolation
JPS61176935A (en) * 1985-01-31 1986-08-08 Dainippon Printing Co Ltd Producing method of gradation for print engraving
JPH01160181A (en) * 1987-12-16 1989-06-23 Canon Inc Picture processor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5896459A (en) * 1981-12-04 1983-06-08 Matsushita Electric Ind Co Ltd Quantizing method for picture luminance signal
JPS6253107B2 (en) * 1981-12-04 1987-11-09 Matsushita Electric Ind Co Ltd
JPS61126593A (en) * 1984-11-26 1986-06-14 仲井　久雄 Color shading method and apparatus by gray level random number interpolation
JPS61176935A (en) * 1985-01-31 1986-08-08 Dainippon Printing Co Ltd Producing method of gradation for print engraving
JPH01160181A (en) * 1987-12-16 1989-06-23 Canon Inc Picture processor
JP2662405B2 (en) * 1987-12-16 1997-10-15 キヤノン株式会社 Image processing device

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