JPS55138169A - Picture signal control system of picture input unit - Google Patents
Picture signal control system of picture input unitInfo
- Publication number
- JPS55138169A JPS55138169A JP4708779A JP4708779A JPS55138169A JP S55138169 A JPS55138169 A JP S55138169A JP 4708779 A JP4708779 A JP 4708779A JP 4708779 A JP4708779 A JP 4708779A JP S55138169 A JPS55138169 A JP S55138169A
- Authority
- JP
- Japan
- Prior art keywords
- document
- picture
- signal
- signals obtained
- time
- 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
- Image Input (AREA)
- Facsimile Heads (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
PURPOSE: To prevent error recognition of characters by equalizing in magnitude signals obtained from parts, equal in shade value, on the surface of picture recording part, etc., by controlling picture signals obtained from an image sensor corresponding to the moving speed of the recording paper.
CONSTITUTION: Document 1 is irradiated with light 2; a photo signal reflected by document 1 is converted by image sensor 3 into an electric signal, which is amplified by amplification part 7 and then converted by A/D converter 8 into a digital signal to output the picture signal of document 1. A picture input unit of this constitution is provided with pulse generator 4 which generates a pulse signal every time document 1 moves by a unit length and the pulse signal from this generator 4 is applied to the 1st and 2nd timer counters 5 and 6 to measure the time that document 1 takes to advance by a distance of one scan. Then, the gain of amplification part 7 is controlled corresponding to the time of relative unit-length movement between sensor 3 and document 1 to equalize in magnitude signals obtained from parts having an equal shade part, thereby bringing recognition of characters to effect with accuracy.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4708779A JPS55138169A (en) | 1979-04-17 | 1979-04-17 | Picture signal control system of picture input unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4708779A JPS55138169A (en) | 1979-04-17 | 1979-04-17 | Picture signal control system of picture input unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55138169A true JPS55138169A (en) | 1980-10-28 |
Family
ID=12765387
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4708779A Pending JPS55138169A (en) | 1979-04-17 | 1979-04-17 | Picture signal control system of picture input unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55138169A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5927379A (en) * | 1982-08-09 | 1984-02-13 | Hitachi Ltd | Pattern video signal processing system |
-
1979
- 1979-04-17 JP JP4708779A patent/JPS55138169A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5927379A (en) * | 1982-08-09 | 1984-02-13 | Hitachi Ltd | Pattern video signal processing system |
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