JPS56101276A - Signal processing system for contrast picture - Google Patents
Signal processing system for contrast pictureInfo
- 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
Links
- 238000000034 method Methods 0.000 abstract 1
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.
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)
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 |
-
1980
- 1980-01-17 JP JP426480A patent/JPS56101276A/en active Pending
Cited By (6)
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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