JPS54116120A - Quantizing method of video signal and its unit - Google Patents
Quantizing method of video signal and its unitInfo
- Publication number
- JPS54116120A JPS54116120A JP2374178A JP2374178A JPS54116120A JP S54116120 A JPS54116120 A JP S54116120A JP 2374178 A JP2374178 A JP 2374178A JP 2374178 A JP2374178 A JP 2374178A JP S54116120 A JPS54116120 A JP S54116120A
- Authority
- JP
- Japan
- Prior art keywords
- level
- video signal
- quantization
- density
- converter
- 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
Landscapes
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE: To enable to prevent the production of biased profile effect, by performing fine quantization only for the intermediate level of video signal and coarse quantization for low level portions.
CONSTITUTION: The input video signal 1 is level-shifted 2 so that the black (high density)parts correspond to zero level, white (low density) to full scale level, and gray (intermediate density) to zero level. The input and output characteristics of the circuit from the A/D converter 4 to the D/A converter 8 include compression and expansion logic circuits 5, 7, and show the characteristics 50 with fine at around zero level and coarse around full scale level for positive and negative sides, since the converters 4, 8 perform quantization. When video is reproduced with such video signals quantized, since smoother tonal change can be obtained to the intermediate density where human eyes sense mostly the change, the occurrence of biased profile effect can be prevented.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2374178A JPS54116120A (en) | 1978-03-02 | 1978-03-02 | Quantizing method of video signal and its unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2374178A JPS54116120A (en) | 1978-03-02 | 1978-03-02 | Quantizing method of video signal and its unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54116120A true JPS54116120A (en) | 1979-09-10 |
Family
ID=12118724
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2374178A Pending JPS54116120A (en) | 1978-03-02 | 1978-03-02 | Quantizing method of video signal and its unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54116120A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5725776A (en) * | 1980-07-23 | 1982-02-10 | Ricoh Co Ltd | Processing system of picture signal |
JPS6074772A (en) * | 1983-09-29 | 1985-04-27 | Matsushita Electric Ind Co Ltd | Quantizing method of multi-value picture information |
-
1978
- 1978-03-02 JP JP2374178A patent/JPS54116120A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5725776A (en) * | 1980-07-23 | 1982-02-10 | Ricoh Co Ltd | Processing system of picture signal |
JPS6074772A (en) * | 1983-09-29 | 1985-04-27 | Matsushita Electric Ind Co Ltd | Quantizing method of multi-value picture information |
JPH0126591B2 (en) * | 1983-09-29 | 1989-05-24 | Matsushita Electric Ind Co Ltd |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2109138A1 (en) | Device for encoding digital signals representing images, and corresponding decoding device | |
GB2316825B (en) | Image enhancement method and circuit using quantized mean-matching histogram equalization | |
JPS56100572A (en) | Signal processing system of variable density picture | |
JPS54116120A (en) | Quantizing method of video signal and its unit | |
JPS55162179A (en) | Picture processing method | |
US4684984A (en) | Motion compensated interframe decoding apparatus | |
JPS5588479A (en) | Picture signal coding process system | |
JPS5461453A (en) | Analog-digital conversion circuit | |
JPS5730463A (en) | Adaptive forecasting and decoding device | |
JPS57157696A (en) | Processing system for encoding between frames | |
JPS5757088A (en) | Adaptive quantization circuit | |
JPS5775379A (en) | Quantizing circuit | |
JPS54120571A (en) | Dpcm-pcm converter | |
GB8701475D0 (en) | Predictive techniques to analogue transmission of video signals | |
JPS56126392A (en) | Picture tracking device | |
JPS5730464A (en) | Adaptive forecasting and encoding device | |
JPS5447513A (en) | Encoding system for television signal | |
JPS5738083A (en) | Orthogonal conversion decoder | |
JPS5585168A (en) | Shaping circuit for binary signal | |
JPS56169484A (en) | Forecast signal coding system | |
JPS57203179A (en) | Initial value setting circuit for white level follower | |
JPS5750128A (en) | Signal binary coding device | |
JPS574659A (en) | Picture signal correcting device | |
JPS57119516A (en) | Digital to analog converter | |
JPS5378157A (en) | Delta modulatio circuit |