JPS5450219A - Facsimile unit for two-dimensional run length information compression - Google Patents
Facsimile unit for two-dimensional run length information compressionInfo
- Publication number
- JPS5450219A JPS5450219A JP11564077A JP11564077A JPS5450219A JP S5450219 A JPS5450219 A JP S5450219A JP 11564077 A JP11564077 A JP 11564077A JP 11564077 A JP11564077 A JP 11564077A JP S5450219 A JPS5450219 A JP S5450219A
- Authority
- JP
- Japan
- Prior art keywords
- information
- output
- line
- bits
- accumulated
- 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
Abstract
PURPOSE: To compress facsimile information efficiently by reading out information every vertical four or eight bits and discriminating whether vertical column information including black is equal to the preceding vertical column or not and coding this information to transmit.
CONSTITUTION: Four or eight-line components of the sensor output are accumlated in RAM31 in the transmission side, and are read out every vertical four or eight bits by micro μCPU33. Then, it is decide whether this read information is all white or not; and if it includes black, it is discriminated whether this information is equal to the preceding vertical column. Then, this information is coded and transmitted to a telephone line through modulator 32. Meawhile, the signal which has come from the telephone line is demodulated by demodulator 36 to become a digital signal and is accumulated in RAM37. Then, the output is read out by μCPU33 and is accumulated in RAM38 every four or eight bits, and this accumulated output is read out again line by line to drive XY matrix-type drivers 39 and 40 and write the output on receiving paper by write head 41. As a result, four or eight scanning lines are united for run length display, and facsimile information is efficiently compressed.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11564077A JPS5450219A (en) | 1977-09-28 | 1977-09-28 | Facsimile unit for two-dimensional run length information compression |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11564077A JPS5450219A (en) | 1977-09-28 | 1977-09-28 | Facsimile unit for two-dimensional run length information compression |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5450219A true JPS5450219A (en) | 1979-04-20 |
Family
ID=14667639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11564077A Pending JPS5450219A (en) | 1977-09-28 | 1977-09-28 | Facsimile unit for two-dimensional run length information compression |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5450219A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4955213A (en) * | 1972-09-29 | 1974-05-29 | ||
JPS5046424A (en) * | 1973-08-31 | 1975-04-25 |
-
1977
- 1977-09-28 JP JP11564077A patent/JPS5450219A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4955213A (en) * | 1972-09-29 | 1974-05-29 | ||
JPS5046424A (en) * | 1973-08-31 | 1975-04-25 |
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