JPS54114919A - Reader for video information - Google Patents
Reader for video informationInfo
- Publication number
- JPS54114919A JPS54114919A JP2155978A JP2155978A JPS54114919A JP S54114919 A JPS54114919 A JP S54114919A JP 2155978 A JP2155978 A JP 2155978A JP 2155978 A JP2155978 A JP 2155978A JP S54114919 A JPS54114919 A JP S54114919A
- Authority
- JP
- Japan
- Prior art keywords
- read
- video information
- charge storage
- photo detection
- 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
- Facsimile Image Signal Circuits (AREA)
- Image Input (AREA)
- Facsimile Heads (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
PURPOSE: To obtain the video signal which can correctly be reproducible at the reception side, by making the average output level of the video signal into normal value, through the control of amplification factor depending on the time reading in one video information with the photo detection element of the read-in head.
CONSTITUTION: In the video information reader performing the read-in of manuscript using the read-in head 11 arranging one or more self scanning type photo detection elements operated at charge storage mode, the increment of the charge storage time required for the photo detection element to read in one video information after another, is detected. As the method of detection, for example, the clock P from the clock pulse generator 13 is counted with the counter 16 and the value is memorized in the memory circuit 7, then it is made to analog signal with the D/A converter 18. The difference between the analog signal and the reference value 19 is taken with the gain control circuit 20 and it is fed to the amplifier 14. Thus, depending on the length of the charge storage time, the gain of the amplifier is changed, controlling the average output level of the video signal Vid into a normal value.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2155978A JPS54114919A (en) | 1978-02-28 | 1978-02-28 | Reader for video information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2155978A JPS54114919A (en) | 1978-02-28 | 1978-02-28 | Reader for video information |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54114919A true JPS54114919A (en) | 1979-09-07 |
Family
ID=12058359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2155978A Pending JPS54114919A (en) | 1978-02-28 | 1978-02-28 | Reader for video information |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54114919A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5642469A (en) * | 1979-09-16 | 1981-04-20 | Ricoh Co Ltd | Partial read recorder |
| JPS5724167A (en) * | 1980-07-18 | 1982-02-08 | Canon Inc | Picture information processor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51113543A (en) * | 1975-03-31 | 1976-10-06 | Hitachi Ltd | Video signal correcting equipment |
-
1978
- 1978-02-28 JP JP2155978A patent/JPS54114919A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51113543A (en) * | 1975-03-31 | 1976-10-06 | Hitachi Ltd | Video signal correcting equipment |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5642469A (en) * | 1979-09-16 | 1981-04-20 | Ricoh Co Ltd | Partial read recorder |
| JPS5724167A (en) * | 1980-07-18 | 1982-02-08 | Canon Inc | Picture information processor |
| JPH0119311B2 (en) * | 1980-07-18 | 1989-04-11 | Canon Kk |
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