JPS605663A - Color picture reader - Google Patents
Color picture readerInfo
- Publication number
- JPS605663A JPS605663A JP58113573A JP11357383A JPS605663A JP S605663 A JPS605663 A JP S605663A JP 58113573 A JP58113573 A JP 58113573A JP 11357383 A JP11357383 A JP 11357383A JP S605663 A JPS605663 A JP S605663A
- Authority
- JP
- Japan
- Prior art keywords
- original
- light source
- image sensor
- filter elements
- filter
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/48—Picture signal generators
- H04N1/482—Picture signal generators using the same detector device sequentially for different colour components
- H04N1/484—Picture signal generators using the same detector device sequentially for different colour components with sequential colour illumination of the original
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Color Image Communication Systems (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】
し産業上の利用分野〕
この発明は、ファクシミリ等に用いられて原稿のカラー
画像を光電的に読取るカラー画像読取装置に関する。DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a color image reading device that is used in facsimiles and the like and photoelectrically reads color images on a document.
原稿のカラー画像を光電的に読取るために、分光特性の
異なる複数の光源を、イメージセンサの原稿読取走査周
期に同期させて各別に順次点滅させながら、この際の原
稍反射元を逐次イメージセンサに結像させることにより
、当該原稿の同一走査ラインについて上記光源の数に対
応した複数種類の光電変換信号を得、次にこれら光電変
換信号のレベルに基づいて上記読取走査した原稿の当該
走査ラインにおける画像色を判別するというカラー画像
読取装置が用いられている。In order to photoelectrically read the color image of a document, multiple light sources with different spectral characteristics are sequentially blinked individually in synchronization with the document reading scan period of the image sensor, and the original reflection sources are sequentially detected by the image sensor. By imaging the same scanning line of the original, multiple types of photoelectric conversion signals corresponding to the number of light sources are obtained, and then based on the levels of these photoelectric conversion signals, the scanning line of the original that has been read and scanned is determined based on the level of these photoelectric conversion signals. A color image reading device is used that discriminates the image color in .
このような従来のカラー画像読取装置の一例として、上
記光源ζこ赤色蛍光灯と青色蛍光灯の2つの蛍光灯を使
用して「1¥色」、「赤色」、「黒色」の3種類のカラ
ー1作を読取る場合の装置を第1図に示す。As an example of such a conventional color image reading device, the above-mentioned light source ζ uses two fluorescent lamps, a red fluorescent lamp and a blue fluorescent lamp, to read three types of ``color'', ``red'', and ``black''. FIG. 1 shows an apparatus for reading a single color work.
すなわち、1aが青色蛍光灯、■bが赤色蛍光灯であり
、図示しない点灯回路によってこれら蛍光灯が点灯され
ると、青色蛍光灯1aからは青色光信号BCが、また赤
色蛍光灯1bからは赤色光信号ReがそれぞれJ9.稿
2の同一部分(ライン)を照射するように発せられる。That is, 1a is a blue fluorescent lamp, and b is a red fluorescent lamp. When these fluorescent lamps are turned on by a lighting circuit (not shown), a blue light signal BC is emitted from the blue fluorescent lamp 1a, and a blue light signal BC is emitted from the red fluorescent lamp 1b. The red light signal Re is J9. The light is emitted so as to illuminate the same part (line) of document 2.
また、この原稿2からの反射光はレンズ3によって例え
ばCCD(電荷結合素子)ラインセンサよりなるイメー
ジセンサ4に結像され、該イメージセンサ4によってこ
の光量に対応した電圧レベルを有する電気信号(光電変
換信号−CE)に変換される。5は上記光電変換信号C
Eのレベル♀1」定を行なうカラー判別回路で、上記’
6’jlr取走査した原稿2の画像色を逐次判別する。The reflected light from the original 2 is imaged by a lens 3 onto an image sensor 4 made of, for example, a CCD (charge-coupled device) line sensor, and the image sensor 4 transmits an electrical signal (photoelectric signal) having a voltage level corresponding to the amount of light. converted signal -CE). 5 is the photoelectric conversion signal C
This is a color discrimination circuit that determines the E level ♀1.
6'jlr The image color of the scanned original 2 is sequentially determined.
なお、上記青色蛍光灯1aの蛍光体としては例えはタン
グステン酸力ルシュウムが使用され、また赤色蛍光灯1
bの蛍光体としては例えばゲルマニウム酸マグネシウム
が使用きれている。Note that, for example, tungsten oxide is used as the phosphor for the blue fluorescent lamp 1a, and for the red fluorescent lamp 1,
As the phosphor b, for example, magnesium germanate has been used up.
上述したように、分光特性の異なる複数の光源を順次点
滅させながらこの除の原稿反射光を逐次イメージセンサ
に結像させるようになされたカラー画像読取装置におい
ては、複数の光源を設けなければならず、また例えば上
述の例の場合、赤色蛍光灯1bに用いられる赤色発光の
蛍光体(例えばゲルマニウム酸マグネシウム)は、青色
蛍光灯1aに用いられる青色発光の蛍光体(例えばタン
グステン酸カルシウム)に比べて一般に点滅応答性が悪
く、残光時間が長いものである。このため赤色蛍光灯1
bを点滅さぜた場合、その残光時間は読取走査を行なう
こ己ができず、したがってこれによって原稿読取速度が
制限される不都合があった。また複数の光源を用いる場
合、それらの劣化が一様でないことにより、811取ら
れたカラー画像の色バランスが長期間において変化する
という不都合もあった。As described above, in a color image reading device that sequentially blinks a plurality of light sources with different spectral characteristics and sequentially images the reflected light from the original on the image sensor, it is necessary to provide a plurality of light sources. Also, for example, in the case of the above example, the red-emitting phosphor (e.g., magnesium germanate) used in the red fluorescent lamp 1b is more expensive than the blue-emitting phosphor (e.g., calcium tungstate) used in the blue fluorescent lamp 1a. In general, the flickering response is poor and the afterglow time is long. Therefore, red fluorescent lamp 1
When b is blinked, reading scanning cannot be performed during the afterglow time, and this has the disadvantage of limiting the document reading speed. Furthermore, when a plurality of light sources are used, there is also the problem that the color balance of a color image taken at 811 changes over a long period of time due to uneven deterioration of the light sources.
この発明は、複数の光源を用いた従来のカラー画像読取
装置の欠点を解消して、高速度のyf、稿読取を簡易な
借成をも゛って可能にしたカラー画像読取装置を提供す
ることを目的とする。The present invention eliminates the drawbacks of conventional color image reading devices using multiple light sources and provides a color image reading device that enables high-speed YF and document reading with simple borrowing. The purpose is to
〔発明の41i>成〕
この発明では単一の発温を用い、該光源からイメージセ
ンサに至る光路の途上に、透過光帯域特性の異なる棲莢
文のフィルタ素子よりなる光学フィルタを設け、これら
復敢のフィルタ素子をイメージセンサによる原稿読敗走
をの周期に対応した所定の周期で前記光路の途上に順次
選択的に介挿するようになされている。[41i of the Invention] In this invention, a single heating element is used, and an optical filter consisting of filter elements with different capsule structures having different transmitted light band characteristics is provided on the optical path from the light source to the image sensor. The filter elements are sequentially and selectively inserted into the optical path at a predetermined period corresponding to the period of the image sensor reading and failing the document.
第2図にこの発明lこかかるカラー画像読取装置の一実
施例を示す。FIG. 2 shows an embodiment of a color image reading device according to the present invention.
すなわぢ、第2図において、1は白色光を発する光源で
、この光源1のまわりに、互いに透過光帯域特性の異な
る枚数のフィルタ素子6 a s 6b p6cを軸の
まわりに等角間隔をもって配置した円筒型の光学フィル
タ7が回転自在に設けられている。この場合、例えばフ
ィルタ素子6aが赤色フィルタ、フィルタ素子6bが緑
色フィルタ、フィルタ素子6cが青色フィルタとなされ
ている。光学フィルタ7は、モータ8により、イメージ
センサ4による原(11読取走査の周期に対応した所定
の周期で回転されるようになされ、これによりフィルタ
素子6a〜6cが、光源1から原稿に至る光路9に順次
選択的に介挿され、フィルタ素子6a〜6Cの沢光波長
帯域特性に対応した分光特性を有する複数の光がイメー
ジセンサ4の原稿読取走査周期に同期して順次原稿を照
射する。したがって原稿2の同一走査ラインについて光
学フィルタ7のフィルタ素子6a〜6Cの数に対応した
3種類の光電変換信号CFをイメージセンサ4より得る
ことができる。次にカラー判別回路5で光電変換信号C
Eのレベルの判定を行ない、読取走査した原稿20画像
色を連間判別すればよい。In other words, in Fig. 2, reference numeral 1 is a light source that emits white light, and around this light source 1, a number of filter elements 6a, 6b, and 6c having different transmitted light band characteristics are arranged at equal angular intervals around the axis. A cylindrical optical filter 7 is rotatably provided. In this case, for example, the filter element 6a is a red filter, the filter element 6b is a green filter, and the filter element 6c is a blue filter. The optical filter 7 is rotated by a motor 8 at a predetermined period corresponding to the period of the original (11) reading scan by the image sensor 4, so that the filter elements 6a to 6c are rotated in the optical path from the light source 1 to the original. A plurality of lights having spectral characteristics corresponding to the emission wavelength band characteristics of the filter elements 6a to 6C are sequentially and selectively inserted into the filter elements 6a to 6C and sequentially illuminate the original in synchronization with the original reading scanning period of the image sensor 4. Therefore, three types of photoelectric conversion signals CF corresponding to the number of filter elements 6a to 6C of the optical filter 7 can be obtained from the image sensor 4 for the same scanning line of the original 2. Next, the photoelectric conversion signal C
It is only necessary to determine the level of E and to determine the color of the 20 images of the read and scanned documents consecutively.
なお、上述の実施例においては、光学フィルタ7が光源
1から原稿2に至る直接光の光路9上に設けられている
が、これを原稿2からイメージセンサ4に至る反射光の
光路9′上に設けてもよい。In the above embodiment, the optical filter 7 is provided on the optical path 9 of direct light from the light source 1 to the original 2, but it is also provided on the optical path 9' of reflected light from the original 2 to the image sensor 4. may be provided.
その場合の光学フィルタは、複数のフィルタ素子を放射
状に配置した円板型光学フィルタが適している。In this case, a disc type optical filter in which a plurality of filter elements are arranged radially is suitable as the optical filter.
この発明にかかるカラー画像読取装置によれば、単一の
光源をもってその目的を達成することができ、したがっ
て相数の光源を用いた従来の゛装置の場合のように点滅
応答特性の悪い光源によって原稿読取速度が制限される
不都合もなく、また複数の光源の劣化のバラツキによる
色バランスの変化を生じることもないから、高速度かつ
高忠実度をもってカラー画像の読取りを行なうことがで
きる。According to the color image reading device according to the present invention, the purpose can be achieved with a single light source, and therefore, it is possible to achieve the purpose with a single light source, and therefore, it is possible to achieve the purpose by using a single light source. Color images can be read at high speed and with high fidelity because there is no inconvenience that the document reading speed is limited, and there is no change in color balance due to variations in deterioration of a plurality of light sources.
第1図は従来のカラー画像読取装置の一例についてその
概略組成を示すブロック図、第2図はこの発明にかかる
カラー画像読取装置の一実施例の概略措成を示すブロッ
ク図である。
■・・・光源、2・・原稿、3・・レンズ、4・・・イ
メージセンサ、5・・・カラー判別回路、5a、5b、
5c・・・フィルタ素子、7・光学フィルタ、8・・・
モータ、9.9′・・・光路。FIG. 1 is a block diagram showing a schematic structure of an example of a conventional color image reading device, and FIG. 2 is a block diagram showing a schematic structure of an embodiment of a color image reading device according to the present invention. ■...Light source, 2...Document, 3...Lens, 4...Image sensor, 5...Color discrimination circuit, 5a, 5b,
5c... Filter element, 7. Optical filter, 8...
Motor, 9.9'... light path.
Claims (1)
射光が結像されるように配置されかつ該原稿の画像を読
取走査するようになされたイメージセンサと、それぞれ
透過光帯域特性の異なる複数のフィルタ素子よりなる光
学フィルタと、該光学フィルタを駆動してその前記複数
のフィルタ素子を、前記イメージセンサによる原稿読取
走査の周期に対応した所定の周期で、前記光源から前記
イメージセンサに至る光路の途上に順次選択的に介挿す
るための手段を具えたカラー画像読取装置。A light source for illuminating the original, an image sensor arranged so that the reflected light of the light irradiated onto the original from the light source is formed into an image, and configured to read and scan the image of the original, and each of them has a transmission light band characteristic. an optical filter including a plurality of different filter elements, and driving the optical filter to move the plurality of filter elements from the light source to the image sensor at a predetermined period corresponding to the period of document reading scanning by the image sensor. A color image reading device equipped with means for sequentially and selectively interposing the optical path along the optical path.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58113573A JPS605663A (en) | 1983-06-23 | 1983-06-23 | Color picture reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58113573A JPS605663A (en) | 1983-06-23 | 1983-06-23 | Color picture reader |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS605663A true JPS605663A (en) | 1985-01-12 |
Family
ID=14615661
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58113573A Pending JPS605663A (en) | 1983-06-23 | 1983-06-23 | Color picture reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS605663A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4855818A (en) * | 1984-07-04 | 1989-08-08 | Sharp Kabushiki Kaisha | Document reading apparatus with color filter |
-
1983
- 1983-06-23 JP JP58113573A patent/JPS605663A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4855818A (en) * | 1984-07-04 | 1989-08-08 | Sharp Kabushiki Kaisha | Document reading apparatus with color filter |
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