JPS54137912A - Picture quantization system - Google Patents
Picture quantization systemInfo
- Publication number
- JPS54137912A JPS54137912A JP4532478A JP4532478A JPS54137912A JP S54137912 A JPS54137912 A JP S54137912A JP 4532478 A JP4532478 A JP 4532478A JP 4532478 A JP4532478 A JP 4532478A JP S54137912 A JPS54137912 A JP S54137912A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- scanning
- circuit
- binary
- comparison reference
- 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 code a variable-density picture effectively by controlling at least either scanning input signal or comparison reference signal at each scanning-line period when converting a difference signal, obtained by comparing the scanning input signal with the comparison reference voltage, into a binary signal.
CONSTITUTION: Scanning circuit 1 scans on a picture optically and then converts the signal into an electric signal, and comparator circuit 3 compares the output of circuit 1 with a comparison reference voltage and converts the difference signal into a binary signal. In this case, a pulse synchronizing with the horizontal scanning signal, a scan output, is applied to timing-signal application terminal 5 and then sent via counter 6 to comparator circuit 3, where at least either scanning input signal or comprison reference signal is controlled at each scanning line period, and the output of circuit 3 is outputted as a binary quantization signal via sampling circuit 4. Consequently, a variable-density picture can be coded effectively.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4532478A JPS54137912A (en) | 1978-04-19 | 1978-04-19 | Picture quantization system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4532478A JPS54137912A (en) | 1978-04-19 | 1978-04-19 | Picture quantization system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54137912A true JPS54137912A (en) | 1979-10-26 |
Family
ID=12716120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4532478A Pending JPS54137912A (en) | 1978-04-19 | 1978-04-19 | Picture quantization system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54137912A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8801397B2 (en) | 2009-10-14 | 2014-08-12 | Panasonic Corporation | Compressor |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4917918A (en) * | 1972-06-07 | 1974-02-16 | ||
JPS52109322A (en) * | 1976-03-10 | 1977-09-13 | Hitachi Ltd | Gradation binary value signal generating device |
-
1978
- 1978-04-19 JP JP4532478A patent/JPS54137912A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4917918A (en) * | 1972-06-07 | 1974-02-16 | ||
JPS52109322A (en) * | 1976-03-10 | 1977-09-13 | Hitachi Ltd | Gradation binary value signal generating device |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8801397B2 (en) | 2009-10-14 | 2014-08-12 | Panasonic Corporation | Compressor |
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