JPS5564472A - Quantizing unit for picture signal - Google Patents
Quantizing unit for picture signalInfo
- Publication number
- JPS5564472A JPS5564472A JP13752078A JP13752078A JPS5564472A JP S5564472 A JPS5564472 A JP S5564472A JP 13752078 A JP13752078 A JP 13752078A JP 13752078 A JP13752078 A JP 13752078A JP S5564472 A JPS5564472 A JP S5564472A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output
- picture
- buffer memory
- register
- 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 make it possible to set the best threshold level even in quantization of a picture signal with large variation in background level, by relatively varying the threshold level in accordance with outputs of several picture elements before and after a picture element of a picture signal to be quantized.
CONSTITUTION: Input signal VIN is converted into a digital signal by A/D converter 1 and picture signal VD of each picture element is sent to shift register 3 by way of buffer memory 2. Register 3 delays signal VD by a certain time and through buffer memory 4, output VS is sequentially sent to shift register 5, where input VS is delayed by the same shift time as register 3 to obtain output VM. Output VM is inverted by inverting buffer memory 6 into -VM, which is inputted to adder 8. The output of memory 2 is limited by set level L of limiter 7 into VD', which is inputted to adder 8, but it is added integrally to input -VM to output threshold level VR. Comparator 9 consider signal VS greater VR to be zero and VS less than VR to be "1" to obtain a quantized signal.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13752078A JPS5564472A (en) | 1978-11-08 | 1978-11-08 | Quantizing unit for picture signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13752078A JPS5564472A (en) | 1978-11-08 | 1978-11-08 | Quantizing unit for picture signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5564472A true JPS5564472A (en) | 1980-05-15 |
Family
ID=15200591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13752078A Pending JPS5564472A (en) | 1978-11-08 | 1978-11-08 | Quantizing unit for picture signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5564472A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8894366B2 (en) | 2008-03-05 | 2014-11-25 | Alstom Renewable Technologies | Francis-type hydraulic turbine wheel equipped with a tip-forming member, and method of reducing fluctuations using such a wheel |
-
1978
- 1978-11-08 JP JP13752078A patent/JPS5564472A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8894366B2 (en) | 2008-03-05 | 2014-11-25 | Alstom Renewable Technologies | Francis-type hydraulic turbine wheel equipped with a tip-forming member, and method of reducing fluctuations using such a wheel |
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