JPH0433481A - Image pickup device - Google Patents
Image pickup deviceInfo
- Publication number
- JPH0433481A JPH0433481A JP2141141A JP14114190A JPH0433481A JP H0433481 A JPH0433481 A JP H0433481A JP 2141141 A JP2141141 A JP 2141141A JP 14114190 A JP14114190 A JP 14114190A JP H0433481 A JPH0433481 A JP H0433481A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal panel
- pickup
- image pickup
- lens system
- 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.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 238000002834 transmittance Methods 0.000 claims description 8
- 230000003595 spectral effect Effects 0.000 claims description 7
- 238000003384 imaging method Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
- Color Television Image Signal Generators (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は、入射光量調整機構付きのビデオカメラ等の撮
像装置に関する。DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an imaging device such as a video camera with an incident light amount adjustment mechanism.
（ロ）従来の技術
通常のビデオカメラでは、太陽下や室内等撮像環境に応
じて被写体照度が様々に変化しても、撮像素子への入射
光量を常に一定に保ち、撮像映像信号の輝度レベルが極
端に高いある０は低し）状態を回避するためにメカ的な
絞り機構が配されて（する。このメカ的な絞り機構は、
数枚の羽根と、この羽根の開閉機構により構成されるた
め、絞り機構自体が小型化に適さず、構成部品点数が多
く、また消費電力も大きくなるというメカ式であること
による独特の欠点を有していた。(b) Conventional technology In ordinary video cameras, even if the illuminance of the subject varies depending on the imaging environment, such as under the sun or indoors, the amount of light incident on the image sensor is always kept constant, and the brightness level of the captured video signal is kept constant. In order to avoid the situation where 0 is extremely high and 0 is low, a mechanical aperture mechanism is installed.
Since it is composed of several blades and a mechanism for opening and closing these blades, the diaphragm mechanism itself is not suitable for miniaturization, has a large number of components, and consumes a lot of power. had.
そこで、特開昭６２−１６９５８７号公報（Ｈ０４Ｎ５
／２３８）では、メカ的な絞り機構を用いず、撮像素子
の前方に液晶パネルを配設し、この液晶パネルの光透過
率を電気的に制御することにより、入射光量の調整を行
う一例が提案されている。Therefore, Japanese Patent Application Laid-open No. 169587/1987 (H04N5
/238) is an example of adjusting the amount of incident light by placing a liquid crystal panel in front of the image sensor and electrically controlling the light transmittance of this liquid crystal panel, without using a mechanical aperture mechanism. Proposed.
（ハ）発明が解決しようとする課題
前記従来技術は、赤外領域の感度については何ら考慮さ
れていない。即ち、通常のビデオカメラでは、赤外光が
強い場合に撮像素子自体が飽和する状態を回避するため
に、ガラスあるいはプラスチック製の赤外カットフィル
タを撮像素子自体に挿入する工夫が為されているが、夜
間撮影時には撮像素子は赤外領域に対して低感度になり
露出不足に陥りやすくなる。(c) Problems to be Solved by the Invention The above-mentioned prior art does not take into account sensitivity in the infrared region at all. In other words, in normal video cameras, in order to avoid saturation of the image sensor itself when the infrared light is strong, an infrared cut filter made of glass or plastic is inserted into the image sensor itself. However, when shooting at night, the image sensor has low sensitivity in the infrared region and is prone to underexposure.
（ニ）課題を解決するための手段
本発明は、レンズ系と撮像素子間に配された液晶パネル
の複数のフィルタ画素を、光透過率と共に分光特性も制
御可能とし、更にレンズ系に入射される光の強さに応じ
てこれらの光透過率及び分光特性を制御することを特徴
とする。(d) Means for Solving the Problems The present invention makes it possible to control not only the light transmittance but also the spectral characteristics of a plurality of filter pixels of a liquid crystal panel arranged between a lens system and an image sensor, and furthermore, it is possible to control the spectral characteristics of a plurality of filter pixels of a liquid crystal panel arranged between a lens system and an image sensor. It is characterized by controlling these light transmittance and spectral characteristics according to the intensity of light.
（ホ） 作 用
本発明は上述の如く構成したので、通常の露出調整と共
に赤外光の強弱が生じる撮影条件に対しても、撮像素子
の前段にある液晶パネルにて対処可能となる。(e) Function Since the present invention is constructed as described above, it is possible to cope with photographing conditions in which the intensity of infrared light is changed in addition to normal exposure adjustment by using the liquid crystal panel in the front stage of the image sensor.
（へ）実施例 以下、図面に従い本発明の実施例について説明する。(f) Example Embodiments of the present invention will be described below with reference to the drawings.
第１図は全体の回路ブロック図である。被写体（１）か
らの光は、レンズ系（２）に入射されて集光され、液晶
パネル（３）を経て固体撮像素子（ＣＣＤ）（４）上に
結像されて光電変換されて、信号処理回路（５）にて撮
像映像信号に変換される。FIG. 1 is an overall circuit block diagram. Light from an object (1) is incident on a lens system (2), is focused, passes through a liquid crystal panel (3), forms an image on a solid-state image sensor (CCD) (4), is photoelectrically converted, and is converted into a signal. The processing circuit (5) converts it into a captured video signal.
この撮像映像信号中の輝度信号は、輝度レベル検出器（
６）にてレベル検出が為されて、この検出結果が制御回
路（７）に供給される。光検知！（８）は被写体の明る
さを検知する側光手段で、この検知結果は制御回路（７
）及び赤外発光ランプ（９）に入力される。The brightness signal in this captured video signal is detected by a brightness level detector (
Level detection is performed in step 6), and the detection result is supplied to the control circuit (7). Light detection! (8) is a side light means that detects the brightness of the subject, and the detection result is transmitted to the control circuit (7).
) and an infrared emitting lamp (9).
赤外発光ランプ（９）は、光検知器（８）出力が所定レ
ベルにより小さい場合に夜間撮影時と判断して発光する
。The infrared light emitting lamp (9) determines that it is night photography and emits light when the output of the photodetector (8) is smaller than a predetermined level.
制御回路（７）はレベル検出回路（６）にて検出された
輝度レベル及び光検知器（８）による検知出力に応じて
、液晶パネル（３）を駆動させる駆動回路（１０）に制
御信号を発する。The control circuit (7) sends a control signal to the drive circuit (10) that drives the liquid crystal panel (3) according to the brightness level detected by the level detection circuit (6) and the detection output from the photodetector (8). emanate.
液晶パネル（３）はＣＣＤ（４）とレンズ系（２）の間
の光路中に配置されるが、ＣＣＤ（４）よりもレンズ系
（２）の近くに配されている。これは、液晶パネルの色
フィルタの画素配置により、光量が影響されない様にす
る理由による。ここで、液晶パネル（３）の色フイルタ
画業配列の例を第２図に示す。第２図の（ＢＧ）は第４
図（ａ）の特性を有するＢＧフィルター、つまり赤外カ
ットフィルターであり、（Ｒ）は第４図（ｂ）の特性を
有するＲフィルター、つまり赤外透過フィルターであり
、水平方向に両フィルターが交互に配列されている。The liquid crystal panel (3) is placed in the optical path between the CCD (4) and the lens system (2), but it is placed closer to the lens system (2) than the CCD (4). This is because the amount of light is not affected by the pixel arrangement of the color filter of the liquid crystal panel. Here, an example of the color filter arrangement of the liquid crystal panel (3) is shown in FIG. (BG) in Figure 2 is the fourth
A BG filter, that is, an infrared cut filter, has the characteristics shown in Figure 4 (a), and (R) represents an R filter, that is, an infrared transmission filter, that has the characteristics shown in Figure 4 (b), and both filters are arranged horizontally. arranged alternately.
次に具体的に液晶パネル（３）による光量調整動作につ
いて説明する。光検知器（８）では撮影時の明るさを感
知し、十分な明るさが得られる昼光下での撮影であると
判断された場合には、制御回路（７）はＲフィルター（
Ｒ）の部分に対応する画素の光透過率を極めて小さくし
て、実質的にＲフィルターをＯＦＦ状態とし、この状態
でレベル検出器（６）から得られる輝度レベルが目標レ
ベルになる様にＢＧフィルター（ＢＧ）の部分に対応す
る画素の光透過率を制御して、最適な光量がＣＣＤ（４
）に与えられて最適な露出状態が実現させる。尚、この
時のＣＣＤ（４）の分光感度特性は、第５図の曲線（Ｂ
）の様になる。Next, the light amount adjustment operation by the liquid crystal panel (3) will be specifically explained. The photodetector (8) detects the brightness at the time of photographing, and if it is determined that the photograph was taken in daylight where sufficient brightness can be obtained, the control circuit (7) activates the R filter (
The light transmittance of the pixel corresponding to the R) portion is made extremely small to substantially turn off the R filter, and in this state, the BG is set so that the brightness level obtained from the level detector (6) becomes the target level. By controlling the light transmittance of the pixel corresponding to the filter (BG) part, the optimum light amount can be adjusted to the CCD (4
) to achieve optimal exposure conditions. The spectral sensitivity characteristics of the CCD (4) at this time are shown by the curve (B) in Figure 5.
).
一方、光検知器（８）での検知レベルが所定値に達しな
い程に暗い場合には、夜間撮影時であると判断され、Ｒ
フィルター（Ｒ）のＯＦＦ状態が解除され、即ち、ＢＧ
フィルター（ＢＧ）部分の画素の光透過率を略１００％
にすると共にＲフィルター（Ｒ）部分の画素の光透過率
も略１００％にして、できるだけ多くの光をＣＣＤ（４
）に与える様にすると同時に、撮像装置に装着された赤
外ランプ（９）を発光させて、ＣＣＤ（４）より十分な
出力が得られる様に為す。尚、この時のＣＣＤ（４）の
分光感度特性は、第５図の曲線（Ａ）の様になる。On the other hand, if the detection level at the photodetector (8) is so dark that it does not reach the predetermined value, it is determined that night photography is being performed, and R
The OFF state of the filter (R) is released, that is, the BG
Light transmittance of pixels in filter (BG) part is approximately 100%
At the same time, the light transmittance of the pixels in the R filter (R) part is set to approximately 100%, and as much light as possible is transmitted to the CCD (4
), and at the same time, the infrared lamp (9) attached to the imaging device is made to emit light so that sufficient output can be obtained from the CCD (4). Incidentally, the spectral sensitivity characteristics of the CCD (4) at this time are as shown by the curve (A) in FIG.
尚、液晶パネル（３）の色フィルターの配列例としては
、第２図に限定されるものではなく、第３図の様に液晶
パネルのフィルターを格子状に分割し、Ｒフィルターと
ＢＧフィルターを四辺で隣接させる様に配列することも
可能である。The arrangement example of the color filters of the liquid crystal panel (3) is not limited to that shown in Fig. 2, but the filters of the liquid crystal panel may be divided into a lattice shape as shown in Fig. 3, and the R filter and the BG filter may be arranged. It is also possible to arrange them so that they are adjacent on all four sides.
また、昼光下での撮影か夜間撮影かを判別する光検出器
（８）の機能をレベル検出器（６）に兼用させ、輝度レ
ベルが所定レベル未満の時に夜間撮影、所定レベル以上
の時に昼光下での撮影と判断することも可能である。In addition, the level detector (6) doubles as the photodetector (8) that determines whether the photo is taken in daylight or at night, so that when the brightness level is below a predetermined level, the photo is taken at night, and when the brightness level is above a predetermined level, the photodetector (8) is used. It is also possible to determine that the photograph was taken in daylight.
（ト）発明の効果
上述の如く本発明によれば、液晶パネルを光路中に配設
するという極めて簡単な構成により、夜間撮影から昼光
時の撮影まで幅広い撮影条件下における自動露出調整が
容易に可能となる。(g) Effects of the Invention As described above, according to the present invention, the extremely simple configuration of disposing a liquid crystal panel in the optical path facilitates automatic exposure adjustment under a wide range of shooting conditions, from night photography to daylight photography. becomes possible.
図面は全て本発明の実施例に係り、第１図は全体の回路
ブロック図、第２図及び第３図は液晶パネルのフィルタ
ー配列を示す図、第４図は各フィルターの特性図、第５
図はＣＣＤの分光感度特性図である。The drawings all relate to embodiments of the present invention, and FIG. 1 is an overall circuit block diagram, FIGS. 2 and 3 are diagrams showing the filter arrangement of the liquid crystal panel, FIG. 4 is a characteristic diagram of each filter, and FIG. 5 is a diagram showing the filter arrangement of the liquid crystal panel.
The figure is a spectral sensitivity characteristic diagram of a CCD.
Claims (1)
段と、 明るさを検知する検知手段と、 前記レンズ系と前記撮像手段間に配され、該検知手段出
力により光透過率及び分光特性が制御可能な複数のフィ
ルタ画素を有する液晶パネルを備える撮像装置。(1) A lens system that collects light and forms an image on an image sensor, an imaging device that captures the formed image and outputs a captured video signal, a detection device that detects brightness, and the lens system. and the imaging device, and includes a liquid crystal panel having a plurality of filter pixels whose light transmittance and spectral characteristics can be controlled by the output of the detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14114190A JP3187820B2 (en) | 1990-05-29 | 1990-05-29 | Imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14114190A JP3187820B2 (en) | 1990-05-29 | 1990-05-29 | Imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0433481A true JPH0433481A (en) | 1992-02-04 |
| JP3187820B2 JP3187820B2 (en) | 2001-07-16 |
Family
ID=15285124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14114190A Expired - Fee Related JP3187820B2 (en) | 1990-05-29 | 1990-05-29 | Imaging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3187820B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002084534A (en) * | 2000-09-08 | 2002-03-22 | Fujitsu Ten Ltd | Image processing device |
| GB2415106A (en) * | 2004-06-07 | 2005-12-14 | Sony Corp | Imaging device and portable terminal device |
| CN101995731A (en) * | 2010-07-30 | 2011-03-30 | 西安理工大学 | Liquid crystal-based direct-view anti-glare imager and anti-glare imaging method |
-
1990
- 1990-05-29 JP JP14114190A patent/JP3187820B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002084534A (en) * | 2000-09-08 | 2002-03-22 | Fujitsu Ten Ltd | Image processing device |
| JP4641601B2 (en) * | 2000-09-08 | 2011-03-02 | 富士通テン株式会社 | Image processing apparatus and image processing system |
| GB2415106A (en) * | 2004-06-07 | 2005-12-14 | Sony Corp | Imaging device and portable terminal device |
| GB2415106B (en) * | 2004-06-07 | 2006-08-02 | Sony Corp | Imaging device and portable terminal device |
| CN101995731A (en) * | 2010-07-30 | 2011-03-30 | 西安理工大学 | Liquid crystal-based direct-view anti-glare imager and anti-glare imaging method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3187820B2 (en) | 2001-07-16 |
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