JPH0468691A - Video camera - Google Patents

Video camera

Info

Publication number
JPH0468691A
JPH0468691A JP2178031A JP17803190A JPH0468691A JP H0468691 A JPH0468691 A JP H0468691A JP 2178031 A JP2178031 A JP 2178031A JP 17803190 A JP17803190 A JP 17803190A JP H0468691 A JPH0468691 A JP H0468691A
Authority
JP
Japan
Prior art keywords
white balance
circuit
gain
correction
time
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
Application number
JP2178031A
Other languages
Japanese (ja)
Inventor
Tomohide Okumura
友秀 奥村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2178031A priority Critical patent/JPH0468691A/en
Publication of JPH0468691A publication Critical patent/JPH0468691A/en
Pending legal-status Critical Current

Links

Landscapes

  • Color Television Image Signal Generators (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To photograph with color tone close to the human's sight by correcting the position of white balance setting so as to keep up the color temperature of nature light based on the season and time in photographing. CONSTITUTION:A correction value table 22 outputs a white balance setting position correction data according to the time information inputted from a counting time circuit 20, and the correction data is converted to analog correction signals CR/CB. These signals CR and CB have high levels in the morning and the evening, and are changed according to the time to reduce the level during day. Control voltages VRT and VBT added with these signals CR and CB are inputted to gain control circuits 4/5, the voltage VRT and VBT are increased respectively before correction in the morning and the evening as the voltage VRT is boosted, the gain is increased, and the voltage VBT is dropped, the gain is decreased in the circuit 5, so the white balance is set in the position shifted to a red side. On the other hand, the voltages VRT and VBT become a little bit smaller than the VR and VB, and the white balance is set in the position shifted to a blue side.

Description

【発明の詳細な説明】 [g、業[の利用分野] この発明は、ビデオカメラの白バランス調整装置に関す
る。
DETAILED DESCRIPTION OF THE INVENTION [Field of Application] This invention relates to a white balance adjustment device for a video camera.

〔従来の技術〕[Conventional technology]

第4図は実公昭41−16011号公報に示された従来
のビデオカメラ装置の白バランス調整回路を示すブロッ
ク回路図で、(1)はレンズ、(2)は撮像素子、(3
)は色分離回路、(4)はRチャンネルの利得制御回路
、(5)はBチャンネルの利得制御回路、(6)はプロ
セス回路、(7)はマトリクス回路、(8)はエンコー
ダ回路、(9)は出力端子、(11)はRセンサ(主に
赤色に感度を有する光電変換素子) 、 +12)はG
センサ(主に緑色に感度を有する光電変換素子) 、 
+131はBセンサ(主にn色に感度を有する光電変換
素子) 、 (14)115)は除算回路で、利得制御
回路+41 、 +51および除算回路f141115
+で白バランス調整回路(I6)を構成している。
FIG. 4 is a block circuit diagram showing a white balance adjustment circuit of a conventional video camera device disclosed in Japanese Utility Model Publication No. 41-16011, in which (1) is a lens, (2) is an image sensor, and (3)
) is a color separation circuit, (4) is an R channel gain control circuit, (5) is a B channel gain control circuit, (6) is a process circuit, (7) is a matrix circuit, (8) is an encoder circuit, ( 9) is the output terminal, (11) is the R sensor (a photoelectric conversion element that is mainly sensitive to red), and +12) is the G
Sensor (photoelectric conversion element mainly sensitive to green),
+131 is the B sensor (a photoelectric conversion element that is mainly sensitive to n colors), (14)115) is a division circuit, and the gain control circuits +41, +51 and division circuit f141115
+ constitutes a white balance adjustment circuit (I6).

次に動作について説明する。レンズ(1)から入射した
光画像は、撮像素子(2)により光電変換され、色分離
回路(3)によりH、G 、 BO) 3つの色信号に
色分離される。利得制御回路(4)はR信号の利得を制
御し、利得制御回路(5)はB信号の利得を制御して撮
像画像の白バランスを調整する。
Next, the operation will be explained. A light image incident from a lens (1) is photoelectrically converted by an image sensor (2), and color separated into three color signals (H, G, BO) by a color separation circuit (3). A gain control circuit (4) controls the gain of the R signal, and a gain control circuit (5) controls the gain of the B signal to adjust the white balance of the captured image.

他り、Rセンサ(II)、Gセンサ(12)、Bセンサ
(13)は、入射光のR成分、G成分、B成分に比例し
た出力信号Rs 、Gs 、Bsを発生する。除算回路
(14)は入射光の光5に依存しないG成分とR成分の
比as/R,(=VLl)を出力し、除算回路(+5)
はB成分とG成分の比B、/Gs (=VIりを出力す
る。利得制御回路(4)は制御電圧VRが大きくなるに
したがってその利得が大きくなり、利得制御回路(5)
は制御電圧■8が大きくなるにしたがってその利得が小
さくなる制御特性に構成されており、色温度が低い光源
、つまりG成分に対してR成分が多くB成分が少ない光
源の場合には、制御電圧V、、V、の値は色温度が高い
場合に比べて低い値となる。したがって、光源の色温度
が低い場合にはRチャンネルの利得制御回路(4)の利
得は小さく、Bチャンネルの利得制御回路(5)の利得
は大きくなる。
In addition, the R sensor (II), the G sensor (12), and the B sensor (13) generate output signals Rs, Gs, and Bs proportional to the R component, G component, and B component of the incident light. The division circuit (14) outputs the ratio as/R, (=VLl) of the G component and the R component that does not depend on the light 5 of the incident light, and the division circuit (+5)
outputs the ratio B, /Gs (=VI) of the B component and the G component.The gain control circuit (4) increases its gain as the control voltage VR increases, and the gain control circuit (5)
is configured to have a control characteristic in which the gain decreases as the control voltage ■8 increases, and in the case of a light source with a low color temperature, that is, a light source with a large R component and a small B component relative to the G component, the control The value of the voltages V, , V, is lower than when the color temperature is high. Therefore, when the color temperature of the light source is low, the gain of the R channel gain control circuit (4) is small and the gain of the B channel gain control circuit (5) is large.

逆に1色濃度の高い光源、つまりG成分に対してR成分
が少なくB成分が多い光源の場合には、Rチャンネルの
利得制御回路(4)の利得は大きくなり、Bチャンネル
の利得制御回路(5)の利得は小さくなる。
Conversely, in the case of a light source with a high density of one color, that is, a light source with less R component and more B component than G component, the gain of the R channel gain control circuit (4) increases, and the gain of the B channel gain control circuit increases. The gain of (5) becomes smaller.

このように、光源に含まれるR成分、G成分。In this way, the R component and G component included in the light source.

B成分の変化、つまり色温度に対応して、l(チャンネ
ルの利得制御回路(4)の利得及びBチャンネルの利得
制御回路(5)の利得を自動的に制御することにより、
白バランスを調整している。
By automatically controlling the gain of the channel gain control circuit (4) and the gain of the B channel gain control circuit (5) in response to changes in the B component, that is, color temperature,
Adjusting the white balance.

第5図は特開昭63−242090号公報に示された白
バランス回路のブロック回路図で、第4図中のRセンサ
(II)、 GセンサFIZ)、 Bセンサ(13)に
代えて色分離回路(3)からのB信号、G信号7 B信
号をそれぞれ積分する積分回路、(17)、 (+8)
、 (+91を設け、その積分信号を制御信号V、、V
、とじて利得制御回路+4)+5)の利得制御を行うよ
うに構成したもので、第4図の従来例と同様な動作原理
で白バランス調整をとることができる。
Fig. 5 is a block circuit diagram of the white balance circuit shown in Japanese Patent Application Laid-Open No. 63-242090. B signal and G signal 7 from separation circuit (3) Integrating circuit that integrates B signal, (17), (+8)
, (+91 is provided, and the integral signal is used as the control signal V,,V
, and control the gain of the gain control circuits +4) and +5), and the white balance can be adjusted using the same operating principle as the conventional example shown in FIG.

[発明が解決しようとする課題] 従来のビデオカメラの白バランス装置は以上のように構
成されているので、光源の色温度が変化しても常に一定
の白バランスに調整される。このため、例えば夕焼けな
ど明らかに人間の眼には白い被写体も赤味がかって見え
る場合でも、被写体を白く撮像してしまうので、却って
不自然な撮影画像になるという問題点があった。
[Problems to be Solved by the Invention] Since the conventional white balance device for a video camera is configured as described above, the white balance is always adjusted to a constant value even if the color temperature of the light source changes. For this reason, even if an obviously white subject, such as a sunset, appears reddish to the human eye, the subject is captured as white, resulting in a rather unnatural captured image.

この発明は上記のような問題点を解消するためになされ
たもので、光源の色温度が変化した場合に、人間の視感
覚に近い、より自然な撮像画となる白バランス調整がで
きるビデオカメラの白バランス装置を得ることを目的と
する。
This invention was made to solve the above problems, and provides a video camera that can adjust the white balance to produce a more natural captured image that is closer to human visual perception when the color temperature of the light source changes. The purpose is to obtain a white balance device.

〔課題を解決するための手段〕[Means to solve the problem]

この発明に係る白バランス装置は、撮影時の自然光の色
温度に対応する補正データを得る手段と、この補正デー
タに基づいて白バランス調整1段の白バランス設定位置
を撮影時の自然光による視感に近づくように補正する手
段とを備えたものである。
The white balance device according to the present invention includes a means for obtaining correction data corresponding to the color temperature of natural light at the time of shooting, and a means for obtaining correction data corresponding to the color temperature of natural light at the time of shooting, and a means for obtaining correction data corresponding to the color temperature of natural light at the time of shooting, and a white balance setting position of one step of white balance adjustment based on the correction data. and means for correcting it so that it approaches .

〔作用] この発明における補正データを得るL段は、撮影時の自
然光の色温度に対応する補正データを出力し、白バラン
ス設定位置を補正する手段は、その補正データにもとづ
いて白バランス調整手段の白バランス設定位置を撮影時
の自然光による色感に近づく(例えば夕刻(夕焼け)時
には、臼バランスを赤方向にすらす)ように白バランス
の設定を変更する。
[Function] In the present invention, the L stage for obtaining correction data outputs correction data corresponding to the color temperature of natural light at the time of photographing, and the means for correcting the white balance setting position is a white balance adjusting means based on the correction data. Change the white balance setting so that the white balance setting position approaches the color sense of natural light at the time of shooting (for example, at dusk (sunset), move the mill balance toward red).

〔実施例J 第1図はこの発明の構成を示すブロック回路図で、(2
0)は時刻情報を発生する計時刻回路、(21)は計時
刻回路(20)から得られる時刻情報に応じて白バラン
ス調整回路(16)の白バランスの設定位置、つまり色
温度を補正する自バランス設定位置補正回路である。
[Embodiment J Figure 1 is a block circuit diagram showing the configuration of this invention.
0) is a timekeeping circuit that generates time information, and (21) is a timekeeping circuit that corrects the white balance setting position of the white balance adjustment circuit (16), that is, the color temperature, according to the time information obtained from the timekeeping circuit (20). This is a self-balance setting position correction circuit.

第2図は白バランス調整回路(16)を第4図に示した
従来例と同じ構成とし、白バランス設定位置補正回路(
21)を具体的にした実施例のブロック回路し1で、(
22)は計時刻回路(20)の出力情報に応じて白バラ
ンスの設定位置を補正するデータを出力する補正(10
テーブル、(23)、 +241は補正値テーブル(2
2)から出力された補IFデータをアナログ信号に変換
するD/A変換器、(25)はD/A変換器(23)の
出力C8と、除算回路(14)の出力VRとを加算する
加算器、同じ< +261はD/A変換器(24)の出
力Csと除算回路(15)の出力V、とを加資する加算
器で、加算器(25)の出力VR7は利得制御回路(4
)に、加算器(5)の出力VBTは利得制御回路(5)
にそれぞれ利得制御15号として入力される。
In Figure 2, the white balance adjustment circuit (16) has the same configuration as the conventional example shown in Figure 4, and the white balance setting position correction circuit (16) has the same configuration as the conventional example shown in Figure 4.
21) is a concrete example block circuit.
22) is a correction (10) that outputs data for correcting the white balance setting position according to the output information of the timekeeping circuit (20).
Table (23), +241 is the correction value table (2
A D/A converter that converts the supplementary IF data output from 2) into an analog signal, and (25) adds the output C8 of the D/A converter (23) and the output VR of the divider circuit (14). The adder, same < +261, is an adder that adds the output Cs of the D/A converter (24) and the output V of the division circuit (15), and the output VR7 of the adder (25) is added to the output Cs of the D/A converter (24) and the output V of the divider circuit (15).
), the output VBT of the adder (5) is controlled by the gain control circuit (5).
are respectively input as gain control No. 15.

次に動作を説明する。Next, the operation will be explained.

補正額テーブル(22)は、計時刻回路(20)から入
力される時刻情報に応じた白バランス設定位置補正デー
タを出力し、その補正データはD/A変換器(231、
(241によってアナログの補正信号C8゜C8に変換
される。この補正信号CR,Caは例えば第3図に示し
たように、朝夕のレベルが高く、日中のレベルが低くな
るように時刻に従って変化する。加算器(251、(2
61は、この補正信号C,,C,を制御電圧V、、V、
にそれぞれ加算する。この補正信号C,,C,が加算さ
れた制御電圧V n7.V BTは利得制御回路(4)
、(5) 1m入力され、その利得を変化させる。利得
制御回路(4)は、制御電圧VRTが大きくなるのに従
ってその利得が大きくなり、利得制御回路(5)は制御
電圧V RTが大きくなるのに従ってその利得が小さく
なるので、朝夕は、制御型Pc V RT、 V at
はそれぞれ補正前より大きくなり、Rチャンネルの利得
制御回路(4)の利得はより大きく、Bチャンネルの利
得制御回路(5)の利得はより小さくなって白バランス
は若干光測にずれた位置に設定される。
The correction amount table (22) outputs white balance setting position correction data according to the time information input from the time measurement circuit (20), and the correction data is sent to the D/A converter (231,
(It is converted into an analog correction signal C8°C8 by 241. For example, as shown in Fig. 3, the correction signals CR and Ca change according to the time of day so that the level is high in the morning and evening, and the level is low during the day. Adder (251, (2
61 converts the correction signals C, ,C, into control voltages V, ,V,
Add to each. The control voltage V n7. to which the correction signals C, , C, are added. V BT is gain control circuit (4)
, (5) 1m is input and its gain is changed. The gain of the gain control circuit (4) increases as the control voltage VRT increases, and the gain of the gain control circuit (5) decreases as the control voltage VRT increases. Pc V RT, V at
are larger than before correction, the gain of the R channel gain control circuit (4) is larger, the gain of the B channel gain control circuit (5) is smaller, and the white balance is at a position slightly deviated from the photometry. Set.

逆に、日中の制御電圧VRア、V、?はVRlVllよ
り少しだけ小さくなり、白バランスは少しだけ前側にず
れた位置に設定される。このように、時刻に応じて、白
バランスの設定位置の補正が行なわれる。この結果、撮
影された画像の色調は、視感覚に近い色調の画像となる
On the other hand, during the day, the control voltage VRa, V, ? is slightly smaller than VRlVll, and the white balance is set to a position slightly shifted to the front. In this way, the white balance setting position is corrected depending on the time. As a result, the color tone of the photographed image becomes an image with a color tone close to the visual sense.

なお、上記実施例では二つの補正イ言号cR08を同じ
パターンで変化するものとしたが、必ずしも同じパター
ンで変化させる必要は無く、白バランス設定をより効果
的に変化させるために、異なるパターンとしても良いこ
とは当然である。
In the above embodiment, the two correction words cR08 are changed in the same pattern, but it is not necessarily necessary to change them in the same pattern, and in order to change the white balance setting more effectively, they can be changed in different patterns. Of course it is also good.

また、−上記実施例では、時刻情報を得るために計時刻
回路(20)を設けたが、ビデオカメラに、スーパーイ
ンボーズを行うための計時側手段が設けられている場合
には、その計時側手段を利用しても良いことは言うまで
もない。
Further, - in the above embodiment, the timekeeping circuit (20) is provided to obtain time information, but if the video camera is provided with a timekeeping means for performing superimposition, the timekeeping circuit (20) is provided. It goes without saying that you can also use side means.

また、補正値テーブル(22)はマイクロコンピュータ
により実現することも可能であり、D/A変換器を内蔵
したマイクロコンピュータであればより好適である。
Further, the correction value table (22) can also be realized by a microcomputer, and a microcomputer with a built-in D/A converter is more suitable.

また、上記実施例では、−日の時刻に対してのみ白バラ
ンスの設定位置を補正したが、時刻のみならず、日付情
報も含めて白バランスの設定位置を補正することにより
、日照時間の変化にも対応して、より正確な白バランス
の補正ができることは明らかである。
In addition, in the above embodiment, the white balance setting position was corrected only for the time of -day, but by correcting the white balance setting position not only for the time but also for the date information, it is possible to correct changes in sunlight hours. It is clear that more accurate white balance correction can be made in response to

また、白バランス調整回路(16)に、人工光と太陽光
の切換え手段が設けられている場合には、太陽光が選択
されている時のみ白バランス位置補正回路(21)が作
動するように構成すれば誤使用を避けることができる。
In addition, if the white balance adjustment circuit (16) is provided with means for switching between artificial light and sunlight, the white balance position correction circuit (21) is activated only when sunlight is selected. If configured, misuse can be avoided.

さらに、上記実施例では、白バランス調整回路(16)
に第4図に示した回路を用いたが、第5図に示した白バ
ランス調整回路を用いても同様の効果を得ることができ
ることは明らかであり、この発明は、特定の白バランス
調整回路に限定されるものではない。
Furthermore, in the above embodiment, the white balance adjustment circuit (16)
Although the circuit shown in FIG. 4 was used in this invention, it is clear that the same effect can be obtained by using the white balance adjustment circuit shown in FIG. It is not limited to.

[発明の効果] 以上のように、この発明によれば、撮影時の季節、時刻
にもとづく自然光の色温度の変化に沿うように白バラン
ス調整回路の白バランス設定位置を人間の視感覚に近づ
くように補正する手段を備えたので、人間の視感覚に近
い色調でもって撮影することができるビデオカメラが得
られる効果がある。
[Effects of the Invention] As described above, according to the present invention, the white balance setting position of the white balance adjustment circuit can be brought closer to human visual perception so as to follow the change in color temperature of natural light based on the season and time at the time of shooting. Since the video camera is equipped with a correction means, it is possible to obtain a video camera that can take pictures with a color tone close to the human visual sense.

【図面の簡単な説明】[Brief explanation of the drawing]

第1×はこの発明の構成を示すブロック回路図、第2図
はこの発明の一実施例のブロック回路図、第3図はこの
実施例の補正信号の時刻に対する変化を示す図、第4図
および第5図はそれぞれ異なる従来のビデオカメラの白
バランス調整装置のブロック回路図である。 (15)・・・白バランス調整回路、 (20)・・・
計時刻回路、(21)・・・白バランス設定位置補正回
路、(22)・・・補正値テーブル、(23)、 (2
41・−[) / p、変換器。 なお、各図中、同一符号は同一 または相当部分を示す
1.X is a block circuit diagram showing the configuration of this invention, FIG. 2 is a block circuit diagram of an embodiment of this invention, FIG. 3 is a diagram showing changes in the correction signal with respect to time in this embodiment, and FIG. 4 and FIG. 5 are block circuit diagrams of different conventional white balance adjustment devices for video cameras. (15)...White balance adjustment circuit, (20)...
Time measurement circuit, (21)... White balance setting position correction circuit, (22)... Correction value table, (23), (2
41・−[)/p, converter. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

【特許請求の範囲】[Claims] (1)白バランス調整手段と、撮影時の自然光の色温度
に対応する補正データを得る手段と、この補正データに
もとづき上記白バランス調整手段の白バランス設定位置
を撮影時の自然光による視感に近づくように補正する手
段とを備えたビデオカメラ。
(1) A white balance adjustment means, a means for obtaining correction data corresponding to the color temperature of natural light at the time of shooting, and based on the correction data, the white balance setting position of the white balance adjustment means is adjusted to the visual perception due to the natural light at the time of shooting. and a means for correcting the video camera to approach the video camera.
JP2178031A 1990-07-03 1990-07-03 Video camera Pending JPH0468691A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2178031A JPH0468691A (en) 1990-07-03 1990-07-03 Video camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2178031A JPH0468691A (en) 1990-07-03 1990-07-03 Video camera

Publications (1)

Publication Number Publication Date
JPH0468691A true JPH0468691A (en) 1992-03-04

Family

ID=16041382

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2178031A Pending JPH0468691A (en) 1990-07-03 1990-07-03 Video camera

Country Status (1)

Country Link
JP (1) JPH0468691A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008013204A (en) * 2006-07-05 2008-01-24 Univ Of Yamanashi Liquid container

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008013204A (en) * 2006-07-05 2008-01-24 Univ Of Yamanashi Liquid container

Similar Documents

Publication Publication Date Title
JP2766067B2 (en) Imaging device
US5473375A (en) Electronic still video camera wherein a pre-exposure period is utilized to generate control signals of integrated values of the photoelectrically converted image signal to control both exposure and color balance
JPS60214183A (en) Color image pickup device
KR20040110502A (en) Method for adjusting white balance of digital image device
JPH0437635B2 (en)
JP2000324503A (en) Television camera and white balance correcting method of television camera
US5019894A (en) White balance adjusting circuit
JPH0468691A (en) Video camera
JP2002077937A (en) Device for controlling white balance and method for controlling the same
JP3774480B2 (en) Imaging device
JP2001095008A (en) Image-pickup unit and white balance adjusting method
JPS612487A (en) Automatic white balance adjusting method of color video camera
JPH05211655A (en) Video camera
JPS60218993A (en) White balance device
JPS6180988A (en) Automatic white balance adjuster of color video camera
JPH08237544A (en) Exposure control method for video camera
JP3427501B2 (en) Imaging device
JP2001036923A (en) Automatic white balance adjusting device and its method
JPS62265885A (en) Automatic white balance adjustment circuit
JPS6285590A (en) Video camera and interchangeable lens
JPS6120481A (en) Automatic hue correcting device of color camera
JPH04329790A (en) Automatic white balance correction device
JPS60253935A (en) Color camera
JPS604392A (en) Color temperature compensating device of color television camera
JPH0657067B2 (en) Color temperature compensation device for color television cameras