JPS5493329A - White level set system - Google Patents
White level set systemInfo
- Publication number
- JPS5493329A JPS5493329A JP15792677A JP15792677A JPS5493329A JP S5493329 A JPS5493329 A JP S5493329A JP 15792677 A JP15792677 A JP 15792677A JP 15792677 A JP15792677 A JP 15792677A JP S5493329 A JPS5493329 A JP S5493329A
- Authority
- JP
- Japan
- Prior art keywords
- white level
- character
- voltage
- fed
- video signal
- 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
- Character Input (AREA)
Abstract
PURPOSE: To ensure to perform the identification of character each part, by outputting the white level correction signal of the analog video signal of characters according to the character conditions from the computer and by performing the adjustment of white level with D/A coversion.
CONSTITUTION: To the character conditions such as types of character which are the objective of recognition and writing tools, the optimum white level is checked in advance, and the correction signal which makes the white level of video signal from the image sensor into the optimum white level is memorized in the CPU 5. The correction signal corresponding to the character conditions to recognize is fed from CPU 5 and it is converted into the analog voltage Va with the D/A converter 6. The voltage Va is fed to the negative terminals of the operational amplifier 4 and the video signal V2 from the image sensor is fed to the same terminal via the resistor R2. Taking the feedback resistor as R3, the output voltage V3 is expressed as equation-(2). The voltage V2 can automatically be to the value suitable for each field by the voltage Va, allowing to ensure the character recognition better.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15792677A JPS5493329A (en) | 1977-12-30 | 1977-12-30 | White level set system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15792677A JPS5493329A (en) | 1977-12-30 | 1977-12-30 | White level set system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5493329A true JPS5493329A (en) | 1979-07-24 |
Family
ID=15660478
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15792677A Pending JPS5493329A (en) | 1977-12-30 | 1977-12-30 | White level set system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5493329A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5075743A (en) * | 1973-11-07 | 1975-06-21 |
-
1977
- 1977-12-30 JP JP15792677A patent/JPS5493329A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5075743A (en) * | 1973-11-07 | 1975-06-21 |
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