JPS63242090A - White balancing circuit - Google Patents
White balancing circuitInfo
- Publication number
- JPS63242090A JPS63242090A JP62074436A JP7443687A JPS63242090A JP S63242090 A JPS63242090 A JP S63242090A JP 62074436 A JP62074436 A JP 62074436A JP 7443687 A JP7443687 A JP 7443687A JP S63242090 A JPS63242090 A JP S63242090A
- Authority
- JP
- Japan
- Prior art keywords
- signals
- signal
- circuit
- level
- output
- 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
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims 2
- 239000011159 matrix material Substances 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract description 3
- 238000003384 imaging method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Landscapes
- Processing Of Color Television Signals (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明はビデオカメラ等のホワイトバランス回路に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a white balance circuit for a video camera or the like.
（従来の技術）
ビデオカメラにおいてはホワイトバランスをとることが
重要である。これを行わないと、白色のものが白色に撮
影されなくなってしまう。一方、家庭用ビデオカメラの
最近の動向としては軽量化。(Prior Art) In a video camera, it is important to maintain white balance. If this is not done, white objects will not appear white. On the other hand, the latest trend in home video cameras is to make them lighter.
小形化、低価格化、そして操作の簡略化が要望されてい
る。この操作の簡便化の１つに上記ホワイトバランスを
自動的にとることがあげられる。これは被写体の照明の
色温度をカメラが検知して、自動的にホワイトバランス
をコントロールするものである。例えば、異なった分光
感度を持つ２つのフォトダイオードを組合せたカラーセ
ンサを用い、照明の赤成分と青成分のバランスを検出し
て色温度によって変化する直韓１圧を作り出し、色信号
系の増幅器のゲインを制御するものである。There is a demand for smaller size, lower cost, and simpler operation. One way to simplify this operation is to automatically take the white balance. This allows the camera to detect the color temperature of the subject's lighting and automatically control the white balance. For example, a color sensor that combines two photodiodes with different spectral sensitivities is used to detect the balance between the red and blue components of illumination and create a direct voltage that changes depending on the color temperature. This is to control the gain of.
ところで、あらゆる色温度に対してホワイトバランスが
完全にとれ、しかも光量に依存しないことがホワイトバ
ランスに要求される条件である。By the way, the conditions required for white balance are that the white balance can be perfectly achieved for all color temperatures and that it does not depend on the amount of light.
すなわち、色温度的２，０ＯＯＫから１０，０ＯＯＫに
対して追従性があり、光量的５ ｌｕｘから致方ｔｕｘ
に対しては依存性がないということである。In other words, the color temperature ranges from 2,0OOK to 10,0OOK, and the light quantity ranges from 5 lux to 10,000 lux.
This means that there is no dependence on .
しかしながら、上述した完全追従形のものでは回路が複
雑で高価となり、低価格化の動向に反してしまうていた
。However, the circuit of the above-mentioned perfect tracking type is complicated and expensive, which goes against the trend toward lower prices.
（発明が解決しようとする問題点）
上述したように従来はホワイトパ２ンス′＆！４整の操
作を簡便化しようとすると、低価格化に反してし゛まう
という欠点がありた。本発明はこのような点にかんがみ
てなされたもので、操作が簡便で、かつコストの安いホ
ワイトバランス回路を提供することを目的とする。(Problem to be solved by the invention) As mentioned above, in the past, white space '&! Attempting to simplify the operation of the 4-way adjustment had the disadvantage that it would go against the goal of lowering the price. The present invention has been made in view of these points, and it is an object of the present invention to provide a white balance circuit that is easy to operate and inexpensive.
（問題点を解決するための手段） 本発明では光°１変換累子からの（ｉｆ号からＲ，Ｇ。 (Means for solving problems) In the present invention, from the light degree 1 conversion converter (R, G from the if number).
Ｂ信号を作成し、これらＲ、Ｇ、Ｂ信号のレベルを互い
に比較し、この比較出力にもとづいて複数種の設定電圧
の中から最適なものを選択し、これらを８信号及びＢ信
号の各レベルを調節する調節回路の各制御電圧として供
給するように構成した。Create a B signal, compare the levels of these R, G, and B signals with each other, select the optimal one from among multiple types of setting voltages based on this comparison output, and apply these to each of the 8 signals and the B signal. The configuration is such that it is supplied as each control voltage of the adjustment circuit that adjusts the level.
（作用）
従うて、従来の完全°追従形のものより簡易な構成でコ
ストも安く、かつ所要の機能は十分満足するホワイトバ
ランス回路となる。(Function) Therefore, the white balance circuit has a simpler configuration and lower cost than the conventional complete degree tracking type, and satisfies the required functions.
（実施例）
以下、本発明になるホワイトバランス回路の一実施例に
つき図面をもとに説明する。(Embodiment) An embodiment of the white balance circuit according to the present invention will be described below with reference to the drawings.
図は上記−実施ガを示すブロック図である。（１）は撮
像レンズ、（２）はＣ０Ｄ（［荷結合素子）の撮像素子
、（３）は信号処理回路、（４）は色マトリクス回路、
（５） 、 （６）はそれぞれＲ（赤色）信号、Ｂ（１
色）信号に対するレベル調節回路ｓ （７） 、 （８
）はそれぞれ色差信号であるＲ−Ｙ、Ｂ−Ｙ信号作成回
路である。The figure is a block diagram showing the above-mentioned implementation. (1) is an imaging lens, (2) is a C0D ([charge coupling device]) imaging element, (3) is a signal processing circuit, (4) is a color matrix circuit,
(5) and (6) are R (red) signal and B (1
Level adjustment circuits for (color) signals (7), (8
) are R-Y and B-Y signal generation circuits, respectively, which are color difference signals.
また（９）乃至（１１）は積分回路、α２乃至α荀は比
較器、αＳは切換回路、αＧ乃至餞は電圧設定回路であ
る。Further, (9) to (11) are integrating circuits, α2 to αX are comparators, αS is a switching circuit, and αG to 錞 are voltage setting circuits.
次に本実施例回路の動作につき説明する。被写体からの
像はレンズ（１）を介してＣＯＤ （２）の撮像面に結
像する。信号処理回路（３）ではＣＣＤ撮像素子（２）
から得られた電気信号にもとづいてＲ，Ｇ、 Ｂ信号を
作成し、これを色マトリクス回路（４）及び積分回路（
９）乃至αυに供給する。積分回路（９）乃至ＩではＲ
，Ｇ。Next, the operation of the circuit of this embodiment will be explained. An image from the subject is formed on the imaging surface of the COD (2) via the lens (1). The signal processing circuit (3) uses a CCD image sensor (2)
R, G, and B signals are created based on the electrical signals obtained from the color matrix circuit (4) and the integration circuit (
9) to αυ. R in the integration circuits (9) to I
,G.
Ｂ各信号を直流電圧信号に変換し、これを比較器（Ｉ′
ａ乃至ａ４に出力する。比較器ａり乃至Ｉではそれぞれ
、几及びＢ信号、Ｒ及びＧ信号、Ｂ及びＧ信号の出力電
圧レベルが比較され、比較結果に応じて高レベル出力「
１」、低レベル出力「０」を出力する。B convert each signal into a DC voltage signal, and convert this into a comparator (I'
Output to a to a4. Comparators A to I respectively compare the output voltage levels of the 几 and B signals, R and G signals, and B and G signals, and depending on the comparison results, output a high level.
1” and low level output “0”.
この信号の持つ意味合いを次表に示す。The meaning of this signal is shown in the table below.
Ｒ，Ｇ、 Ｂ信号のレベルを比較した場合、考えられる
組合せは■几＞Ｂ＞Ｇ、■Ｒ＞Ｇ＞Ｂ、■Ｂ＞Ｒ＞Ｇ、
（４）Ｂ＞Ｇ＞Ｒ，■Ｇ＞Ｂ＞Ｒ（７）５Ａりとなる。When comparing the levels of R, G, and B signals, the possible combinations are ■几>B>G, ■R>G>B, ■B>R>G,
(4) B>G>R, ■G>B>R (7) 5A.
一方、これらに対する色温度ポジシ璽ンとしては３００
０にのノ１ｐゲン光下、 ４５００にの螢光打丁、 ６
０００にの太階光下の３ポジシ璽ンとする。この色温度
ポジシ冒ンであれば、多少色温度が変化しても画面上で
は問題ないレベルである。よって、上記組合せの乃至■
に対する色温度ボジシ冒ンは■、■が３００ＯＫ 、■
が４５００Ｋ 、■及び０が６０００ Ｋポジシ嘗ンと
なる。On the other hand, the color temperature positive sign for these is 300.
0 to 1p gen light, 4500 to 4500, fluorescent knife, 6
It is a 3-position sign under the bright light of 000. If the color temperature is set to a positive value, there will be no problem on the screen even if the color temperature changes slightly. Therefore, the above combinations -■
The color temperature is 300 OK, ■
is 4500K, and ■ and 0 are 6000K positions.
（以下余白）
従って、比較器住り乃至α〜の出力信号の組合せ状態に
応じて切換回路α９では上記３ｆｆ［の色温度ポジシ１
ンに対応する電圧設定回路（Ｌｌ１９乃至αυの電圧を
選択切換してレベル調節回路（５）、（６）に供給する
。(Left below) Therefore, depending on the combination state of the output signals of the comparators α~, the switching circuit α9 changes the color temperature position 1 of the above 3ff[.
The voltage setting circuits (Ll19 to αυ) corresponding to the voltages are selectively switched and supplied to the level adjustment circuits (5) and (6).
これにより凡信号、Ｂ信号はレペ、／Ｉ／調節回路（５
）、（６）でそれぞれ所定のレベルにされ、（Ｒ−Ｙ）
信号作成回路（力、（Ｂ−Ｙ）信号作成回路（８）に入
力される。As a result, the normal signal and B signal are
) and (6) respectively to a predetermined level, and (RY)
Signal creation circuit (power, (B-Y) is input to the signal creation circuit (8).
回路（７）、（８）では色マトリクス回路（４）の出力
及びレベル調節回路（５）、（６）の出力信号からそれ
ぞれ、色差信号である几−Ｙ信号、Ｂ−Ｙ信号が作成さ
れる。几信号、Ｂ信号はレベル調節回路（５） 、 （
６）でそのレベルが調節されているため、無彩色を写し
た場合には几−Ｙ信号、Ｂ−Ｙｒｉ号が零となり、ホワ
イトバランスが合うことになる。In circuits (7) and (8), color difference signals, 几-Y signal and BY signal, are created from the output signals of color matrix circuit (4) and level adjustment circuits (5) and (6), respectively. Ru. The level adjustment circuit (5), (
Since the level is adjusted in step 6), when an achromatic color is photographed, the R-Y signal and the B-Yri signal become zero, and the white balance is adjusted accordingly.
本実施例のホワイトバランス回路は回路構成が簡単でコ
ストも安＜、シかも所要の機能は十分満足できる。The white balance circuit of this embodiment has a simple circuit configuration, is low in cost, and can fully satisfy the required functions.
以上述べたように本発明によれば、コストが安く、かつ
ホワイトバランスが簡単にとれるホワイトバランス回路
を提供することができる。As described above, according to the present invention, it is possible to provide a white balance circuit that is low in cost and can easily achieve white balance.
図は本発明になるホワイトバランス回路の一実施例を示
すブロック図である。
１・・・撮像レンズ、 ２・・・撮像素子、３・・
・信号処理回路、５．６・・・レベル調節回路、９乃至
１１・・・積分回路、１２乃至１４・・・比較器、１５
・・・切換回路、１６乃至１８・・・電圧設定回路。
代理人 弁理士 則 近 憲 佑
同 宇治 弘
手続補正書（方式）
１、事件の表示
特願昭６２−７４４３６号
２、発明の名称
ホワイトバランス回路
３、補正をする者
事件との関係 特許出願人
（１０７）株式会社 東芝
・４０代理人
〒１０５
東京都港区芝浦−丁目１番１号
昭和６２年６月３０日（発送日）
６、補正の対象
明細書の図面の簡単な説明の欄
図面
７、補正の内容
（１）明細書の第８頁第３行目の「図は」を「第１図は
」と訂正する。
（２）図面を別紙の通り補正する。
以 上The figure is a block diagram showing an embodiment of a white balance circuit according to the present invention. 1... Imaging lens, 2... Imaging element, 3...
・Signal processing circuit, 5.6...Level adjustment circuit, 9 to 11...Integrator circuit, 12 to 14...Comparator, 15
...Switching circuit, 16 to 18...Voltage setting circuit. Agent Patent Attorney Noriyuki Ken Yudo Hiroshi Uji Procedural amendment (formality) 1. Indication of the case Japanese Patent Application No. 1983-74436 2. Name of the invention White balance circuit 3. Person making the amendment Relationship with the case Patent applicant (107) Toshiba Corporation/40 Agent Address: 1-1 Shibaura-chome, Minato-ku, Tokyo 105 June 30, 1988 (Delivery date) 6. Brief description of drawings in the specification subject to amendment Drawings 7. Contents of the amendment (1) In the third line of page 8 of the specification, "Figure wa" is corrected to "Figure 1 is". (2) Amend the drawing as shown in the attached sheet. that's all
Claims (1)
電変換素子と、この光電変換素子の出力信号からＲ、Ｇ
、Ｂ信号を作成する信号処理回路と、この信号処理回路
からのＲ、Ｇ、Ｂ信号のレベルをそれぞれ互いに比較す
る比較手段と、この比較手段の比較出力にもとづいて複
数種の設定電圧の中から最適な設定電圧を選択し、これ
らをそれぞれ前記Ｒ信号及びＢ信号のレベルを調節する
レベル調節回路の制御電圧として供給する制御回路とを
具備したことを特徴とするホワイトバランス回路。A photoelectric conversion element that converts an optical image obtained through an optical system into an electrical signal, and R, G from the output signal of this photoelectric conversion element.
, a signal processing circuit that creates the B signal, a comparison means that compares the levels of the R, G, and B signals from this signal processing circuit, and a signal processing circuit that compares the levels of the R, G, and B signals from this signal processing circuit, and a 1. A white balance circuit comprising: a control circuit that selects optimal setting voltages from among them and supplies them as control voltages to level adjustment circuits that adjust the levels of the R signal and the B signal, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62074436A JPS63242090A (en) | 1987-03-30 | 1987-03-30 | White balancing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62074436A JPS63242090A (en) | 1987-03-30 | 1987-03-30 | White balancing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63242090A true JPS63242090A (en) | 1988-10-07 |
Family
ID=13547169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62074436A Pending JPS63242090A (en) | 1987-03-30 | 1987-03-30 | White balancing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63242090A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5504524A (en) * | 1993-10-15 | 1996-04-02 | Vlsi Vision Limited | Method and apparatus for controlling color balance of a video signal |
| US5635992A (en) * | 1991-02-28 | 1997-06-03 | Matsushita Electric Industrial Co., Ltd. | Color temperature selector and method of selecting color temperature |
| US6867138B2 (en) | 1999-09-08 | 2005-03-15 | Kabushiki Kaisha Toshiba | Method of chemical/mechanical polishing of the surface of semiconductor device |
-
1987
- 1987-03-30 JP JP62074436A patent/JPS63242090A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5635992A (en) * | 1991-02-28 | 1997-06-03 | Matsushita Electric Industrial Co., Ltd. | Color temperature selector and method of selecting color temperature |
| US5504524A (en) * | 1993-10-15 | 1996-04-02 | Vlsi Vision Limited | Method and apparatus for controlling color balance of a video signal |
| US6867138B2 (en) | 1999-09-08 | 2005-03-15 | Kabushiki Kaisha Toshiba | Method of chemical/mechanical polishing of the surface of semiconductor device |
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