JPS6410778A - Image reader - Google Patents
Image readerInfo
- Publication number
- JPS6410778A JPS6410778A JP62164037A JP16403787A JPS6410778A JP S6410778 A JPS6410778 A JP S6410778A JP 62164037 A JP62164037 A JP 62164037A JP 16403787 A JP16403787 A JP 16403787A JP S6410778 A JPS6410778 A JP S6410778A
- Authority
- JP
- Japan
- Prior art keywords
- shading correction
- light source
- light
- image reader
- image
- 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 Scanning Arrangements (AREA)
Abstract
PURPOSE:To provide the excellent performance of shading correction and to reduce the production cost of an image sensor by executing the shading correction optically. CONSTITUTION:A shading correction member 2 which corrects the shading for a light receiving sensor 5 by adjusting the quantity of reflection of the light from a light source 1 is disposed to the rear side of the light source 1. This means that the shading correction of an image reader that uses a line- shaped light source and the line-shape light receiving sensor 5, etc., is executed optically by adjusting the quantity of the reflecting light from the shading correction member 2 disposed on the rear side of the light source. As a result, the density resolution of an image and the performance of dynamic range can be improved, and also, the cost of the image reader can be reduced because an electrical correction circuit is made unnecessary.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62164037A JPS6410778A (en) | 1987-07-02 | 1987-07-02 | Image reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62164037A JPS6410778A (en) | 1987-07-02 | 1987-07-02 | Image reader |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6410778A true JPS6410778A (en) | 1989-01-13 |
Family
ID=15785603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62164037A Pending JPS6410778A (en) | 1987-07-02 | 1987-07-02 | Image reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6410778A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1459516A1 (en) * | 2001-11-26 | 2004-09-22 | Howtek Devices Corporation | Digitizer with masking apparatus |
-
1987
- 1987-07-02 JP JP62164037A patent/JPS6410778A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1459516A1 (en) * | 2001-11-26 | 2004-09-22 | Howtek Devices Corporation | Digitizer with masking apparatus |
EP1459516A4 (en) * | 2001-11-26 | 2007-06-27 | Howtek Devices Corp | Digitizer with masking apparatus |
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