JPH03123360U - - Google Patents
Info
- Publication number
- JPH03123360U JPH03123360U JP3100090U JP3100090U JPH03123360U JP H03123360 U JPH03123360 U JP H03123360U JP 3100090 U JP3100090 U JP 3100090U JP 3100090 U JP3100090 U JP 3100090U JP H03123360 U JPH03123360 U JP H03123360U
- Authority
- JP
- Japan
- Prior art keywords
- white
- reference surface
- contact glass
- level obtained
- illumination
- 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
- 239000011521 glass Substances 0.000 claims description 3
- 238000003705 background correction Methods 0.000 claims 1
- 238000005286 illumination Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Facsimile Scanning Arrangements (AREA)
Description
第１図は、本考案の一実施例の構成図、第２図
は、原稿白出力とシエーデイング出力の差を説明
する図、第３図は、従来例の構成図、第４図は、
従来構成の問題点を示す図である。
２……コンタクトガラス、３……原稿、４……
照明用のランプ、５……ミラー、７……白基準テ
ープ。
Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a diagram explaining the difference between original white output and shading output, Fig. 3 is a block diagram of a conventional example, and Fig. 4 is a diagram illustrating the difference between original white output and shading output.
It is a figure which shows the problem of a conventional structure. 2...Contact glass, 3...Manuscript, 4...
Lamp for lighting, 5...mirror, 7...white reference tape.
Claims (1)
イング補正用の白基準面を配設し、該白基準面は
、照明によるその基準面からの反射光で得られる
白レベルが前記コンタクトガラス上に載置する原
稿の白地からの反射光で得られる白レベルと略同
等になるような白濃度に設定されていることを特
徴とする画像読取装置。 A white reference surface for shading correction is provided on a part of the inner surface of the contact glass, and the white reference surface has a white level obtained by reflected light from the reference surface caused by illumination when placed on the contact glass. An image reading device characterized in that the white density is set to be approximately equal to the white level obtained by light reflected from the white background of a document.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3100090U JPH03123360U (en) | 1990-03-28 | 1990-03-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3100090U JPH03123360U (en) | 1990-03-28 | 1990-03-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03123360U true JPH03123360U (en) | 1991-12-16 |
Family
ID=31533727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3100090U Pending JPH03123360U (en) | 1990-03-28 | 1990-03-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03123360U (en) |
-
1990
- 1990-03-28 JP JP3100090U patent/JPH03123360U/ja active Pending
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