JPS61101188A - Color television camera - Google Patents
Color television cameraInfo
- Publication number
- JPS61101188A JPS61101188A JP59223427A JP22342784A JPS61101188A JP S61101188 A JPS61101188 A JP S61101188A JP 59223427 A JP59223427 A JP 59223427A JP 22342784 A JP22342784 A JP 22342784A JP S61101188 A JPS61101188 A JP S61101188A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- white
- characteristic
- signal
- image pickup
- 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
- Color Television Image Signal Generators (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、カラーテレビカメラ、詳しくは白バランスの
調整を撮像素子又は撮像管の信号のみを利用し、自動的
に行なう方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color television camera, and more particularly to a method for automatically adjusting white balance using only signals from an image pickup device or an image pickup tube.
従来例の構成とその問題点
一般に白バランス調整を行なう場合には、白い被写体を
撮像するか、前面に拡散板を入れて使用する光源に合わ
せて、Ｒ（赤）、Ｇ（緑）、Ｂ（青）のゲインを１フイ
一ド期間中にピーク値が同じになるように調整する。又
は外部センサーを用いて光源の色温度を検出し、Ｒ，−
（３−Ｂのゲイン調整をする。Conventional configuration and its problems In general, when performing white balance adjustment, either R (red), G (green), or B (Blue) gain is adjusted so that the peak value is the same during one feed period. Or use an external sensor to detect the color temperature of the light source, R,−
(3-Adjust the gain of B.
しかしながら、上記従来例においては外部センサーがな
い場合は、白い被写体や拡散板が必要であり、又望遠で
撮像する場合などは目的の被写体に当っている光の光源
の下で白の被写体を用意するのは困難である。又、外部
センサーを用いて光源の色温度を検出する場合にも、望
遠などで撮像すると、検出している光源と、被写体に当
る光の光源の色温度が異なると、白バランスはとれない
。However, in the conventional example above, if there is no external sensor, a white subject and a diffuser are required, and when shooting telephoto images, prepare a white subject under the light source that is shining on the target subject. It is difficult to do so. Furthermore, even when the color temperature of the light source is detected using an external sensor, white balance cannot be achieved if the color temperature of the detected light source differs from that of the light source of the light hitting the subject when the image is taken using a telephoto lens.
発明の目的
本発明は、上記従来の欠点を除去するものであり、撮像
素子、まだは撮像管の信号のみを利用して容易に白バラ
ンス調整をとるようにすることを目的とするものである
。OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and aims to easily adjust the white balance by using only signals from an image pickup device, currently an image pickup tube. .
発明の構成
本発明は、上記目的を達成するために、撮像素子、又は
撮像管の信号を１フイ一ド期間積分して被写体全体の特
性と光源の特性を出しＲ−Ｇ−１３のゲイン調整をする
ものであり、白バランス調整を簡易にする効果を得るも
のである。Structure of the Invention In order to achieve the above object, the present invention integrates signals from an image sensor or an image pickup tube for one field period to determine the characteristics of the entire object and the characteristics of the light source, and adjusts the gain of the RG-13. This has the effect of simplifying white balance adjustment.
実施例の説明
以下に本発明の一実施例の構成について、図面とともに
説明する。１は撮像素子、又は撮像管であり、２は被写
体、３は光源である。４，５．６は出力された信号をＲ
−（）−Ｂに分離し、ｌフィールド期間積分する積分回
路である。７，８．９は夫々Ｒ−Ｇ−Ｂ信号の増幅回路
、 １０．１１．１２はｌフィールド期間中のＲ−Ｇ−
Ｂ信号のピーク値を検出するピーク検出回路、１３は増
幅回路７゜８．９のゲインを制御するゲインコントロー
ル回−路である。次に上記実施例の動作について説明す
る。白バランスをとるためにＲ，−Ｇ−Ｂのゲイン調整
を、１フィールド期間中のＲ−Ｇ−Ｂのピーク値をピー
ク検出回路１０，１１．１２で検出し、このピーク値が
同じになるようにゲインコントロール回路１３で増幅回
路７，８．９を制御する。DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings. 1 is an image sensor or an image pickup tube, 2 is a subject, and 3 is a light source. 4, 5.6 is the output signal R
-()-B, and is an integrating circuit that performs integration over an l-field period. 7, 8.9 are respectively R-G-B signal amplification circuits, 10.11.12 are R-G-B signal amplifiers during the l field period.
A peak detection circuit 13 detects the peak value of the B signal, and a gain control circuit 13 controls the gain of the amplifier circuit 7°8.9. Next, the operation of the above embodiment will be explained. In order to maintain white balance, R, -G-B gain adjustment is performed by detecting R-G-B peak values during one field period using peak detection circuits 10 and 11.12, and these peak values become the same. The gain control circuit 13 controls the amplifier circuits 7, 8.9 in this manner.
いま、被写体の中に白い物があり、かつ、被写体に当る
光源が白であれば従来方式と同じく、白バランスはこれ
によってとれる。次に被写体に白が含まれない場合、又
は光源自体が白以外の色である場合、積分回路４，５．
６によりＲ，−Ｇ−Ｂの］フィールド期間中を積分し、
このＲ−Ｇ−Ｂの積分値の差が一定レベル以上であれば
被写体全体の特性と、光源の特性を推定し、ピーク検出
のみのＦｔ、−Ｇ−Ｂゲイン調整信号に補正信号を加え
るものである。この補正信号により、ピーク値を検出す
るだけの白バランス調整と比べ、白の被写体を人為的に
撮像するとか、拡散板を入れることもなく、又、光源自
体が白以外の色であっても白バランスをとることができ
るという利点があり、又センサーで光源の色温度を検出
する方式でないので、望遠などで被写体を撮像した場合
などに生ずる、センサーに入射する光と、被写体に当る
光が異なると白バランスがとれないという問題も生じな
いという利点がある。Now, if there is a white object in the subject and the light source hitting the subject is white, the white balance can be achieved using this method, as in the conventional method. Next, when the subject does not contain white, or when the light source itself is a color other than white, the integrating circuits 4, 5.
6, integrate over the R, -G-B] field period,
If the difference in R-G-B integral values is above a certain level, the characteristics of the entire subject and the characteristics of the light source are estimated, and a correction signal is added to the Ft and -G-B gain adjustment signals for peak detection only. It is. Compared to white balance adjustment that only detects the peak value, this correction signal eliminates the need to artificially image a white subject or insert a diffuser, and even when the light source itself is a color other than white. It has the advantage of being able to maintain white balance, and since it does not use a sensor to detect the color temperature of the light source, the light incident on the sensor and the light hitting the subject, which occur when photographing a subject with a telephoto lens, etc. If they are different, there is an advantage that the problem of not being able to maintain white balance occurs.
発明の効果
本発明は、上記のような構成であり、以下に示す効果が
得られるものである。カラーテレビカメラの白バランス
を撮像素子又は撮像管の信号のみを使用して行っている
ので、自動的に白バランスをとることができ、かラー監
視カメラなどの場合など特に有効である。Effects of the Invention The present invention has the above-described configuration, and provides the following effects. Since the white balance of a color television camera is performed using only the signals from the image pickup device or the image pickup tube, the white balance can be automatically achieved, which is particularly effective in the case of a color surveillance camera.
図面は本発明の一実施例におけるカラーテレビカメラを
示すブロック図である。
４、５．６・・・積分回路、１０．１１．１２・・・ピ
ーク検出回路。The drawing is a block diagram showing a color television camera in one embodiment of the present invention. 4, 5.6...Integrator circuit, 10.11.12...Peak detection circuit.
Claims (2)
積分して、被写体全体の特性と光源特性を推定し、ＲＧ
Ｂゲイン調整を行なう回路を設けたカラーテレビカメラ
。(1) Integrate the signal from the image sensor or image pickup tube for one field period to estimate the characteristics of the entire subject and the light source characteristics, and
A color TV camera equipped with a circuit to adjust the B gain.
ーク値検出信号を含むことを特徴とする特許請求の範囲
第１項記載のカラーテレビカメラ。(2) The color television camera according to claim 1, wherein the RGB gain adjustment input includes a peak value detection signal during one field period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59223427A JPS61101188A (en) | 1984-10-23 | 1984-10-23 | Color television camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59223427A JPS61101188A (en) | 1984-10-23 | 1984-10-23 | Color television camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61101188A true JPS61101188A (en) | 1986-05-20 |
Family
ID=16797971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59223427A Pending JPS61101188A (en) | 1984-10-23 | 1984-10-23 | Color television camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61101188A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6345989A (en) * | 1986-08-12 | 1988-02-26 | Canon Inc | Color image processing method |
| JPS6455996A (en) * | 1987-08-27 | 1989-03-02 | Canon Kk | Image pickup device |
| JPH02295295A (en) * | 1989-05-10 | 1990-12-06 | Hitachi Ltd | White balance device |
| US5021875A (en) * | 1987-02-18 | 1991-06-04 | Minolta Camera Kabushiki Kaisha | Automatic white-balance adjusting apparatus with reduced sensitivity to transient light conditions |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6152885B2 (en) * | 1979-01-09 | 1986-11-15 | Rendamatsukusu Purodakuten Bv |
-
1984
- 1984-10-23 JP JP59223427A patent/JPS61101188A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6152885B2 (en) * | 1979-01-09 | 1986-11-15 | Rendamatsukusu Purodakuten Bv |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6345989A (en) * | 1986-08-12 | 1988-02-26 | Canon Inc | Color image processing method |
| US5021875A (en) * | 1987-02-18 | 1991-06-04 | Minolta Camera Kabushiki Kaisha | Automatic white-balance adjusting apparatus with reduced sensitivity to transient light conditions |
| JPS6455996A (en) * | 1987-08-27 | 1989-03-02 | Canon Kk | Image pickup device |
| JPH02295295A (en) * | 1989-05-10 | 1990-12-06 | Hitachi Ltd | White balance device |
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