JPH0223167U - - Google Patents
Info
- Publication number
- JPH0223167U JPH0223167U JP9636988U JP9636988U JPH0223167U JP H0223167 U JPH0223167 U JP H0223167U JP 9636988 U JP9636988 U JP 9636988U JP 9636988 U JP9636988 U JP 9636988U JP H0223167 U JPH0223167 U JP H0223167U
- Authority
- JP
- Japan
- Prior art keywords
- image data
- white
- reflected light
- image
- reading device
- 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
- 238000003705 background correction Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Facsimile Scanning Arrangements (AREA)
- Facsimile Image Signal Circuits (AREA)
Description
第１図は本考案の画像読取装置の一実施例を示
すブロツク構成図、第２図は本考案の画像読取装
置に用いているＲＯＭに予め格納されたシエーデ
イング補正と対数変換との両方を実行する特性図
、第３図は本考案の画像読取装置の一実施例の動
作を示す流れ図、第４図は従来の画像読取装置の
要部機構図、第５図は従来の画像読取装置の一例
を示すブロツク構成図、第６図は従来の画像読取
装置に用いられているＲＯＭに格納されたシエー
デイング補正の特性図、第７図は従来の画像読取
装置に用いられている対数変換の特性図、第８図
は従来の画像読取装置の動作を示す流れ図である
。
１……ＲＯＭ、１１２……ラツチ、１１３……
アドレスカウンタ（制御部）、１１４……ＲＡＭ
（ラインメモリ）。
Fig. 1 is a block configuration diagram showing an embodiment of the image reading device of the present invention, and Fig. 2 shows the execution of both the shading correction and logarithmic transformation stored in advance in the ROM used in the image reading device of the present invention. FIG. 3 is a flowchart showing the operation of an embodiment of the image reading device of the present invention, FIG. 4 is a mechanical diagram of main parts of a conventional image reading device, and FIG. 5 is an example of a conventional image reading device. 6 is a characteristic diagram of shading correction stored in a ROM used in a conventional image reading device. FIG. 7 is a characteristic diagram of logarithmic conversion used in a conventional image reading device. , FIG. 8 is a flowchart showing the operation of a conventional image reading device. 1...ROM, 112...Latch, 113...
Address counter (control unit), 114...RAM
(line memory).
Claims (1)
となる白板・余白部等からの反射光をＣＣＤ等の
撮像素子で受けアナログ−デイジタル変換をした
後に白リフアレンスデータとしてラインメモリに
蓄えると共に、上記コピー用原稿の本文からの反
射光に基づく画像データをアナログ−デイジタル
変換した後、上記白リフアレンスデータの大きさ
に対応して上記反射光の分布光量を均一にするべ
く補正するシエーデイング補正と反射率から濃度
を算出する対数変換をした後に各種の画像データ
処理を行うようにした画像読取装置において、 上記白リフアレンスデータの出力の大きさをパ
ラメータとして上記シエーデイング補正と対数変
換との乗算を複数個演算し、その演算結果を補正
特性として予め記録・格納したＲＯＭと、 その時における上記ラインメモリの出力結果に
応じて上記複数個の特性の何れかを選択し、上記
画像データの出力を補正して出力するように制御
する制御手段 とを具備したことを特徴とする画像読取装置。[Scope of claim for utility model registration] A document for copying is irradiated with a light source such as a fluorescent lamp, and the reflected light from a reference white board, blank area, etc. is received by an imaging device such as a CCD and converted into a white image after analog-to-digital conversion. After storing the reference data in the line memory and converting the image data based on the reflected light from the main text of the original for copying into analog-to-digital format, the distributed light amount of the reflected light is calculated according to the size of the white reference data. In an image reading device that performs various image data processing after performing shading correction to make it uniform and logarithmic transformation to calculate density from reflectance, the output size of the white reference data is used as a parameter. A plurality of multiplications of the above-mentioned shedding correction and logarithmic transformation are calculated, and the result of the calculation is recorded and stored in advance as a correction characteristic in a ROM, and one of the above-mentioned plurality of characteristics is calculated according to the output result of the above-mentioned line memory at that time. An image reading device comprising: control means for selecting the image data, correcting the output of the image data, and outputting the image data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9636988U JPH0223167U (en) | 1988-07-22 | 1988-07-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9636988U JPH0223167U (en) | 1988-07-22 | 1988-07-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0223167U true JPH0223167U (en) | 1990-02-15 |
Family
ID=31321258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9636988U Pending JPH0223167U (en) | 1988-07-22 | 1988-07-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0223167U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59153377A (en) * | 1983-02-21 | 1984-09-01 | Canon Inc | Shading correcting device |
| JPS6139776A (en) * | 1984-07-31 | 1986-02-25 | Canon Inc | Shading correction system |
-
1988
- 1988-07-22 JP JP9636988U patent/JPH0223167U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59153377A (en) * | 1983-02-21 | 1984-09-01 | Canon Inc | Shading correcting device |
| JPS6139776A (en) * | 1984-07-31 | 1986-02-25 | Canon Inc | Shading correction system |
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