JPH08321986A - Television camera - Google Patents
Television cameraInfo
- Publication number
- JPH08321986A JPH08321986A JP7126031A JP12603195A JPH08321986A JP H08321986 A JPH08321986 A JP H08321986A JP 7126031 A JP7126031 A JP 7126031A JP 12603195 A JP12603195 A JP 12603195A JP H08321986 A JPH08321986 A JP H08321986A
- Authority
- JP
- Japan
- Prior art keywords
- weighting coefficient
- areas
- luminance level
- television camera
- threshold level
- 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
- Exposure Control For Cameras (AREA)
- Diaphragms For Cameras (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、テレビジョンカメラの
オートアイリス(自動絞り)制御装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic iris control device for a television camera.
【0002】[0002]
【従来の技術】図3は従来のテレビジョンカメラの構成
を示すブロック図である。図2は従来のテレビジョンカ
メラのオートアイリスの制御動作フロチャートである。2. Description of the Related Art FIG. 3 is a block diagram showing the structure of a conventional television camera. FIG. 2 is a control operation flowchart of the auto iris of the conventional television camera.
【0003】図3の1はオートアイリスレンズ、2は撮
像素子、3はCDS(コリレイテド・ダブル・サンプリ
ング)回路とAGC(オート・ゲイン・コントロール)
回路、4はA/D変換器、5は映像信号処理用DSP
(デジタルシグナルプロセッサ)、6はD/A変換器、
7はY/Cミックス回路と出力増幅器、8はマイコン
(マイクロコンピュータ)、9はアイリス駆動回路であ
る。In FIG. 3, 1 is an auto iris lens, 2 is an image pickup element, 3 is a CDS (correlated double sampling) circuit and AGC (auto gain control).
Circuit 4, A / D converter, 5 DSP for video signal processing
(Digital signal processor), 6 is a D / A converter,
Reference numeral 7 is a Y / C mix circuit and an output amplifier, 8 is a microcomputer (microcomputer), and 9 is an iris drive circuit.
【0004】次に動作について説明する。被写体からオ
ートアイリスレンズ1を通して入射された光は、撮像素
子2で光電変換され、CDSとAGC回路3でサンプル
ホールドやAGC、ガンマ等の補正を行い、A/D変換
器4でディジタル信号に変換する。この信号から映像信
号処理用DSP5でY、R、G、B信号を作り、輝度処
理、色信号処理を行い、マイコン8のプログラムに従っ
てエンハンサ係数、ガンマ補正係数等のカメラに必要な
係数を付加し、ホワイトバランス処理し、Y、Cのディ
ジタル信号を作る。これらのディジタル信号をD/A変
換器6でアナログ信号に変換し、Y/Cミックスと出力
増幅器7で、輝度信号に色信号を重畳し、モニタ等に出
力するのに十分な大きさに増幅する。Next, the operation will be described. Light incident from the subject through the auto iris lens 1 is photoelectrically converted by the image pickup device 2, the CDS and AGC circuit 3 corrects sample hold, AGC, gamma, etc., and the A / D converter 4 converts it into a digital signal. . Video signal processing DSP 5 creates Y, R, G, and B signals from this signal, performs luminance processing and color signal processing, and adds necessary coefficients for the camera such as enhancer coefficient and gamma correction coefficient according to the program of microcomputer 8. , White balance processing is performed to produce Y and C digital signals. These digital signals are converted into analog signals by the D / A converter 6, and the Y / C mix and the output amplifier 7 superimpose the chrominance signal on the luminance signal and amplify it to a sufficient size for output to a monitor or the like. To do.
【0005】アイリス制御用の信号は、映像信号処理D
SP5から得られるアイリスデータをもとにマイコン8
で逆光/順光等のシーンを判別し、シーン毎に定めた重
み付け係数を掛けアイリス駆動回路9に出力しオートア
イリスレンズ1の絞りを駆動させる。次にマイコン8内
のアイリス制御データ処理について説明する。アイリス
データは図4のように6領域に分割された輝度信号の積
分値である。主要な被写体は通常領域5と領域6にある
ものとする。まず、シーンの大分類をするため、領域1
+領域2と、領域5+領域6の輝度レベルデータを比較
し、領域1+領域2の輝度レベルの方が大きいときは
「逆光」、小さいときは「過度の順光」、差があまり無
いときには「順光」とする。次に、これらの各シーン毎
に、領域1と領域2を比較し、左右のどちらかが明るい
かを判定する。例えば逆光のときには、領域1の輝度レ
ベルの方が大きいときには、「左側が明るい逆光」、小
さいときには「右側が明るい逆光」、差があまり無いと
きには、「左右の明るさが同等の逆光」と判定する。全
体で合計9通りのシーンに分け、各シーン毎にあらかじ
め定めた重み付け係数を各領域毎に乗算し、これらを加
算して画面全体のアイリス制御データとする。重み付け
係数は、小さい程、アイリス制御データが小さくなり、
レンズ絞り1はより開くようになるので順光に対して逆
光では小さく設定し、過度の順光では大きく設定する。The iris control signal is a video signal processing D.
Microcomputer 8 based on iris data obtained from SP5
A scene such as back light / forward light is discriminated by, and a weighting coefficient determined for each scene is multiplied and output to the iris drive circuit 9 to drive the diaphragm of the auto iris lens 1. Next, the iris control data processing in the microcomputer 8 will be described. The iris data is the integrated value of the luminance signal divided into 6 areas as shown in FIG. It is assumed that the main subject is in the normal areas 5 and 6. First, in order to roughly classify the scenes, the area 1
The luminance level data of the + region 2 and the region 5 + region 6 are compared, and when the luminance level of the region 1 + region 2 is higher, it is "backlit", when it is smaller, it is "excessive forward illumination", and when there is not much difference, it is " Normal light ”. Next, for each of these scenes, the area 1 and the area 2 are compared, and it is determined which of the left and right is brighter. For example, in the case of backlight, when the brightness level of the area 1 is higher, "bright backlight on the left side", when it is small, "bright backlight on the right side" is determined, and when there is not much difference, it is determined that "backlight with equal brightness on the left and right". To do. It is divided into a total of 9 scenes in total, and a weighting coefficient determined in advance for each scene is multiplied for each area, and these are added to obtain iris control data for the entire screen. The smaller the weighting coefficient, the smaller the iris control data,
Since the lens diaphragm 1 becomes more open, it is set to a smaller value for the back light than for the normal light and set to a large value for the excessive normal light.
【0006】[0006]
【発明が解決しようとする課題】前述の従来技術だけで
は各シーンの重み付け係数の設定が1つだけなので、例
えば、主要な被写体がうす暗いような逆光条件のとき
に、被写体が見やすいようにする重み付け係数を設定す
ると、主要な被写体が完全に黒く沈んで見えないような
強い逆光条件のときには露出不足となる。また、反対
に、強い逆光条件のとき被写体が見えやすいようになる
重み付け係数を設定すると、弱い逆光条件のときには露
出過多になってしまうという問題がある。そこで本発明
は、撮像しているシーンによって重み付け係数を増減さ
せ、あらゆるシーンで主要な被写体が見えやすいように
アイリス制御することを目的とする。Since only one weighting coefficient is set for each scene with the above-mentioned prior art alone, it is possible to make the subject easy to see when the main subject is in a backlit condition such that it is faint. When the weighting coefficient is set, underexposure occurs under a strong backlight condition in which the main subject is completely black and cannot be seen. On the contrary, if a weighting coefficient is set so that the subject can be easily seen under the strong backlight condition, there is a problem that the overexposure occurs under the weak backlight condition. Therefore, it is an object of the present invention to increase or decrease the weighting coefficient depending on the scene being imaged, and perform iris control so that a main subject can be easily seen in any scene.
【0007】[0007]
【課題を解決するための手段】本発明の目的を達成する
ために、まず従来と同様にシーン判定により重み付け係
数を設定し、アイリス制御用輝度データに乗算してアイ
リス駆動回路に出力し、レンズ絞りを制御する。このと
きに主要な被写体を含む領域の輝度レベルがあるしきい
値より大きいか小さいか判定し、小さければ輝度レベル
が同等になるまで重み付け係数を減らし、大きければ重
み付け係数を増やしていくというものである。In order to achieve the object of the present invention, first, a weighting coefficient is set by scene determination as in the prior art, and the iris control luminance data is multiplied and output to an iris drive circuit. Control the aperture. At this time, it is determined whether the brightness level of the area including the main subject is higher or lower than a certain threshold value. If the brightness level is lower, the weighting coefficient is decreased until the brightness levels become equal, and if the brightness level is higher, the weighting coefficient is increased. is there.
【0008】[0008]
【作用】その結果、どのような撮像シーンでも主要な被
写体が含まれる領域の輝度レベルが一定に保たれるの
で、被写体が露出不足で黒く沈んだり、露出過多で白く
つぶれることがなく、常に安定した映像が得られる。As a result, the brightness level of the area containing the main subject is kept constant in any shooting scene, so that the subject is not underexposed in black or overexposed and is not crushed in white, and is always stable. You can get the video.
【0009】[0009]
【実施例】以下、本発明の一実施例を図1のフローチャ
ートに基づき説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the flow chart of FIG.
【0010】全体の構成は図3と同様であるので説明は
省略する。従来技術のシーン判定の方法に加え、アイリ
ス制御した後に領域5+領域6の平均輝度レベルを所定
のしきい値と比較する。このしきい値としては見たい主
要な被写体の輝度レベルデータを設定する。領域5と領
域6の輝度レベルがしきい値より低ければ露出不足と判
断し、現在設定されている重み付け係数を減らし、反対
に高ければ露出過多と判断し、重み付け係数を増やして
いく。これをくり返しレンス絞りのハンチングが起きな
いように制御する。Since the overall structure is the same as that shown in FIG. 3, the description thereof will be omitted. In addition to the conventional scene determination method, the average brightness level of the area 5 + area 6 is compared with a predetermined threshold after iris control. As the threshold value, the brightness level data of the main subject to be viewed is set. If the brightness levels of the areas 5 and 6 are lower than the threshold value, it is determined that the exposure is insufficient, the currently set weighting coefficient is decreased, and if the brightness level is high, it is determined that the exposure is excessive and the weighting coefficient is increased. This is repeatedly controlled so that hunting of the lens diaphragm does not occur.
【0011】[0011]
【発明の効果】本発明によれば、どのような撮像条件で
も、主要な被写体が含まれる領域の輝度レベルが一定に
保たれるように制御するので、被写体が露出不足で黒く
沈んだり、露出過多で白くつぶれることがなく、常に安
定した輝度の映像が得られる。According to the present invention, the brightness level of the area including the main subject is controlled to be constant under any image pickup condition, so that the subject is underexposed or blackened or exposed. An image with stable brightness can always be obtained without being overshadowed by whitening.
【図1】本発明の一実施例のフロチャートを示す図。FIG. 1 is a diagram showing a flow chart of an embodiment of the present invention.
【図2】従来のアイリス制御のフロチャートを示す図。FIG. 2 is a diagram showing a conventional iris control flowchart.
【図3】カメラ全体構成を示すブロック図。FIG. 3 is a block diagram showing the overall configuration of a camera.
【図4】画面分割パターン。FIG. 4 is a screen division pattern.
1 オートアイリスレンズ 2 撮像素子 3 CDS、AGC回路 4 A/D変換器 5 映像信号処理DSP 6 D/A変換器 7 Y/Cミックス、出力増幅器 8 マイコン 9 アイリス駆動回路 1 Auto Iris Lens 2 Image Sensor 3 CDS, AGC Circuit 4 A / D Converter 5 Video Signal Processing DSP 6 D / A Converter 7 Y / C Mix, Output Amplifier 8 Microcomputer 9 Iris Drive Circuit
Claims (3)
子から得られる映像信号を用いてレンズ絞りを制御する
テレビジョンカメラにおいて、画面を複数の測光領域に
分割する画面分割手段と、各領域の平均輝度レベルを比
較する手段と、比較した結果により、この平均輝度レベ
ルに重み付け係数を乗算し、それらを加算する手段を有
し、主要な被写体を含む領域が所定の輝度レベルになる
ようにレンズ絞りを制御することを特徴とするテレビジ
ョンカメラ。1. In a television camera using an auto iris lens and controlling a lens diaphragm using a video signal obtained from an image pickup device, a screen dividing means for dividing a screen into a plurality of photometric areas, and an average luminance of each area. A means for comparing the levels and a means for multiplying this average brightness level by a weighting coefficient according to the result of the comparison and adding them are provided, and the lens diaphragm is adjusted so that the area including the main subject has a predetermined brightness level. A television camera characterized by being controlled.
いて画面を複数の領域に分割する手段として映像信号処
理用のDSP(ディジタルシグナルプロセッサ)を用い
ることを特徴とするテレビジョンカメラ。2. The television camera according to claim 1, wherein a DSP (digital signal processor) for video signal processing is used as a means for dividing a screen into a plurality of areas.
いて輝度レベルを比較する手段として、マイクロコンピ
ュータを使用することを特徴とするテレビジョンカメ
ラ。3. A television camera according to claim 2, wherein a microcomputer is used as means for comparing the brightness levels.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7126031A JPH08321986A (en) | 1995-05-25 | 1995-05-25 | Television camera |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7126031A JPH08321986A (en) | 1995-05-25 | 1995-05-25 | Television camera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08321986A true JPH08321986A (en) | 1996-12-03 |
Family
ID=14924981
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7126031A Pending JPH08321986A (en) | 1995-05-25 | 1995-05-25 | Television camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08321986A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE38771E1 (en) * | 1996-12-25 | 2005-08-09 | Matsushita Electric Industrial Co., Ltd. | Exposure controller having coring value adapted to the discharge pulse count |
US6958778B2 (en) | 2000-11-21 | 2005-10-25 | Hitachi Kokusai Electric Inc. | Iris control method and apparatus for television camera for controlling iris of lens according to video signal, and television camera using the same |
-
1995
- 1995-05-25 JP JP7126031A patent/JPH08321986A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE38771E1 (en) * | 1996-12-25 | 2005-08-09 | Matsushita Electric Industrial Co., Ltd. | Exposure controller having coring value adapted to the discharge pulse count |
US6958778B2 (en) | 2000-11-21 | 2005-10-25 | Hitachi Kokusai Electric Inc. | Iris control method and apparatus for television camera for controlling iris of lens according to video signal, and television camera using the same |
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