JP3509157B2 - Aperture control device - Google Patents
Aperture control deviceInfo
- Publication number
- JP3509157B2 JP3509157B2 JP34102793A JP34102793A JP3509157B2 JP 3509157 B2 JP3509157 B2 JP 3509157B2 JP 34102793 A JP34102793 A JP 34102793A JP 34102793 A JP34102793 A JP 34102793A JP 3509157 B2 JP3509157 B2 JP 3509157B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- diaphragm
- color
- difference
- aperture
- 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.)
- Expired - Fee Related
Links
Landscapes
- Color Television Image Signal Generators (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、三原色のフィルタで構
成された円盤を回転させ各原色の像を時分割で撮像する
回転円盤方式のテレビカメラに設けられる絞りを制御す
るための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 a diaphragm control device for controlling a diaphragm provided in a rotary disk type television camera for rotating a disk composed of filters of three primary colors to pick up images of respective primary colors in a time division manner. It is about.
【０００２】[0002]
【従来の技術】Ｒ（赤）・Ｇ（緑）・Ｂ（青）の三原色
のフィルタで構成された円盤を回転させ各色の像を時分
割で撮像する回転円盤方式のテレビカメラにおいては、
従来次のような絞り制御が行われていた。すなわち、こ
の種のテレビカメラは、図４に示すように、絞り４０
１、Ｒ・Ｇ・Ｂの三原色のフィルタで構成された回転円
盤４０２、撮像素子４０３、信号処理回路４０４、輝度
作成回路４０８、差信号検出回路４１１、増幅器４１
２、及び絞り駆動モータ４１３を備えている。2. Description of the Related Art In a rotary disc type television camera which rotates a disc composed of filters of three primary colors of R (red), G (green), and B (blue) to take an image of each color in a time-division manner,
Conventionally, the following aperture control has been performed. That is, this type of television camera has a diaphragm 40 as shown in FIG.
1, a rotary disk 402 composed of filters of three primary colors of R, G, and B, an image sensor 403, a signal processing circuit 404, a luminance creating circuit 408, a difference signal detecting circuit 411, an amplifier 41.
2 and a diaphragm drive motor 413.
【０００３】そして、垂直同期信号に同期して撮像素子
４０３の前面に設けられた円盤４０２が回転され、Ｒ・
Ｇ・Ｂの各原色の像が時分割で順に撮像素子４０３に入
射されて各色の撮像信号が得られる。この各色の撮像信
号は輝度作成回路４０８に入力され、Ｒ・Ｇ・Ｂの各色
毎に平均化されて各色の値から被写体の輝度が求められ
輝度信号が作成される。Then, the disk 402 provided on the front surface of the image pickup device 403 is rotated in synchronization with the vertical synchronizing signal, and R.
The images of the respective primary colors of G and B are sequentially incident on the image sensor 403 in a time division manner, and image signals of respective colors are obtained. The image pickup signals of the respective colors are input to the luminance generation circuit 408, averaged for each of the R, G, and B colors, the luminance of the subject is obtained from the values of the respective colors, and the luminance signal is generated.
【０００４】この輝度信号は差信号検出回路４１１に入
力され、基準信号４１０との差が算出され、この算出値
は誤差信号として増幅器４１２で増幅され、絞り駆動モ
ータ４１３に絞り制御用の信号として入力される。絞り
駆動モータ４１３はこの制御信号に基づいて駆動され、
絞り４０１の開口量が調整される。This luminance signal is input to the difference signal detection circuit 411, the difference from the reference signal 410 is calculated, this calculated value is amplified as an error signal by the amplifier 412, and is outputted to the diaphragm drive motor 413 as a signal for controlling the diaphragm. Is entered. The diaphragm drive motor 413 is driven based on this control signal,
The aperture amount of the diaphragm 401 is adjusted.
【０００５】絞り駆動モータ４１３に入力される前記制
御信号の電圧値は、次式の通りである。The voltage value of the control signal input to the diaphragm drive motor 413 is as follows.
【０００６】 Ｖcntl＝−ＡV ×（Ｋr ×ＹN ＋Ｋg ×ＹN+1 ＋Ｋb ×ＹN+2 −ＶREF ）…（ 式１）V cntl = −A V × (K r × Y N + K g × Y N + 1 + K b × Y N + 2 −V REF ) (Equation 1)
【０００７】ここで、ＹN はＮ番目の撮像入力信号であ
り、式１は該Ｎ番目の撮像入力信号がＲ成分の場合を示
す。ＡV は系の係数で、使用されるモータの種類など、
系の特性により設定される。Ｋr は輝度を求める場合の
Ｒ成分についての係数で、一般に０．３がとられる。同
様にＫg はＧ成分についての係数で、一般に０．６、Ｋ
b はＢ成分についての係数で、一般に０．１がとられ
る。ＶREF は基準電圧である。Here, Y N is the Nth image pickup input signal, and Equation 1 shows the case where the Nth image pickup input signal is the R component. A V is the coefficient of the system, such as the type of motor used
It is set according to the characteristics of the system. K r is a coefficient for the R component when obtaining the luminance, and 0.3 is generally taken. Similarly, K g is a coefficient for the G component, and is generally 0.6, K
b is a coefficient for the B component, and is generally 0.1. V REF is a reference voltage.
【０００８】[0008]
【発明が解決しようとする課題】従来のテレビカメラで
は以上のような絞り制御が行われていたが、次のような
問題点があった。すなわち、従来の絞り制御は、前記式
１からも明らかなように円盤（三原色フィルタ）が回転
してＲ・Ｇ・Ｂのすべての原色信号（ＹN 、ＹN+ 1 、及
びＹN+2 ）が揃うまで絞りを駆動するための制御信号を
得ることができず、このため絞りの制御速度が遅く応答
性に劣るものであった。In the conventional television camera, the aperture control as described above was performed, but there were the following problems. That is, in the conventional diaphragm control, as is clear from the above expression 1, the disk (three primary color filters) rotates and all the R, G, and B primary color signals (Y N , Y N + 1 , and Y N + 2 ). It was impossible to obtain a control signal for driving the aperture until the above conditions were met, and thus the control speed of the aperture was slow and the response was poor.
【０００９】 また、フィルタの切り替わり目での無効
な撮像入力部分は絞り制御用の信号として使用できない
ため、平均結果が小さくなり、これを増幅する場合に撮
像信号に含まれるノイズも増幅され、制御の正確さを欠
いていた。Further, since the invalid image pickup input portion at the switching of the filters cannot be used as a signal for aperture control, the average result becomes small, and when amplifying this, noise included in the image pickup signal is also amplified, and control is performed. Lacked the accuracy of.
【００１０】本発明はこのような従来の絞り制御におけ
る問題点を解決するためになされたもので、高速で正確
な絞り制御を行うことができる絞り制御装置を提供する
ことを目的とするものである。The present invention has been made to solve the problems in the conventional aperture control, and it is an object of the present invention to provide an aperture control device capable of performing accurate aperture control at high speed. is there.
【００１１】[0011]
【課題を解決するための手段】 前記目的を達成すべ
く、本願の発明は、三色のフィルタで各色の像を時分割
で撮像するカメラに設けられる絞りを制御する絞り制御
装置であって、前記絞りの開口量を調整する絞り駆動手
段と、前記フィルタを通して得られた各色信号を記憶す
る記憶手段と、現在の入力色信号と、該現在の入力色信
号と同一色の過去の色信号との差に基づいて前記絞り駆
動手段の駆動量を算出する演算手段とを備え、前記演算
手段により算出された駆動量に基づいて前記各色の信号
が得られる度毎に前記絞りの制御を行うことを特徴とす
る絞り制御装置に係るものである。In order to achieve the above-mentioned object, the invention of the present application is an aperture control device for controlling an aperture provided in a camera for time-divisionally capturing images of each color with filters of three colors, A diaphragm driving unit that adjusts the aperture amount of the diaphragm, a storage unit that stores each color signal obtained through the filter, a current input color signal, and a past color signal of the same color as the current input color signal. And a computing unit that computes the driving amount of the aperture driving unit based on the difference between, and the aperture control is performed every time a signal of each color is obtained based on the driving amount calculated by the computing unit. The present invention relates to an aperture control device.
【００１２】また、別の発明は、前記演算手段が、色信
号の差をＡD 倍（ＡD ＞０）して前記現在の入力色信号
を含む過去の色信号から算出した輝度値に加え、さらに
この算出結果と基準値との差に基づいて前記絞り駆動手
段の駆動量を算出するものである絞り制御装置に係るも
のである。According to another aspect of the present invention, the arithmetic means adds the difference between the color signals to AD times (AD> 0) and adds it to a luminance value calculated from a past color signal including the present input color signal, The present invention relates to an aperture control device that calculates the drive amount of the aperture drive means based on the difference between this calculation result and a reference value.
【００１３】[0013]
【作用】本発明においては、三原色のフィルタで構成さ
れた前記円盤が回転され、これにより各色の撮像信号が
時分割で得られるが、該円盤の回転により異なる色の信
号が得られる度毎に、現在の入力原色信号と、該現在の
入力原色信号と同一色の前記記憶手段に記憶された過去
の原色信号との差に基づいて前記演算手段により絞り駆
動手段の駆動量が算出され、この算出結果に基づいて絞
り駆動手段が駆動されて絞り制御が行われる。According to the present invention, the disk composed of the filters of the three primary colors is rotated, whereby the image pickup signals of the respective colors are obtained in a time division manner. Each time the disk is rotated, a signal of a different color is obtained. The drive amount of the aperture drive means is calculated by the arithmetic means based on the difference between the current input primary color signal and the past primary color signal of the same color as the current input primary color signal stored in the storage means. The diaphragm driving means is driven based on the calculation result to control the diaphragm.
【００１４】また、請求項２の発明では、前記演算手段
は、現在の入力原色信号と、該現在の入力原色信号と同
一色の過去の原色信号との差を算出すると共に、該算出
結果をＡD 倍（ＡD ＞０）して前記現在の入力原色信号
を含む過去の原色信号から算出した輝度値に加え、さら
にこの算出結果と基準値との差に基づいて前記絞り駆動
手段の駆動量を算出する。そしてこの算出結果に基づい
て絞り制御が行われる。Further, in the invention of claim 2, the calculating means calculates a difference between the current input primary color signal and a past primary color signal of the same color as the current input primary color signal, and calculates the calculation result. In addition to the luminance value calculated from the past primary color signals including the current input primary color signal multiplied by A D (A D > 0), the aperture driving means is driven based on the difference between the calculation result and the reference value. Calculate the amount. Then, the aperture control is performed based on the calculation result.
【００１５】ここで前記演算手段により算出される絞り
駆動手段の制御電圧Ｖcntlは、好ましくは次式で表され
る。Here, the control voltage V cntl of the diaphragm driving means calculated by the calculating means is preferably expressed by the following equation.
【００１６】 Ｖcntl＝−ＡV ×（ＡD ×（ＹN −ＹN-3 ）＋Ｋr ×ＹN ＋Ｋg ×ＹN-2 ＋Ｋ b ×ＹN-1 −ＶREF ）…（式２）[0016] Vcntl= -AV × (AD × (YN -YN-3 ) + Kr × YN + Kg × YN-2 + K b × YN-1 -VREF ) ... (Formula 2)
【００１７】ここで、ＹN はＮ番目の撮像信号であり、
同式はＲ、Ｇ、Ｂの順に撮像信号が得られ、Ｎ番目の撮
像信号がＲ成分の場合を示す。ＡV ，ＡD は系の係数
（ＡV，ＡD ＞０）で、使用されるモータの種類など、
系の特性により設定される。Ｋr は輝度を求める場合の
Ｒ成分についての係数で、一般に０．３がとられる。同
様にＫg はＧ成分についての係数で、一般に０．６、Ｋ
b はＢ成分についての係数で、一般に０．１がとられ
る。ＶREF は基準電圧である。Here, Y N is the Nth image pickup signal,
This equation shows a case where image pickup signals are obtained in the order of R, G, B, and the Nth image pickup signal is the R component. A V and A D are system coefficients (A V and A D > 0), such as the type of motor used.
It is set according to the characteristics of the system. K r is a coefficient for the R component when obtaining the luminance, and 0.3 is generally taken. Similarly, K g is a coefficient for the G component, and is generally 0.6, K
b is a coefficient for the B component, and is generally 0.1. V REF is a reference voltage.
【００１８】今、被写体の明るさが変化せず絞り制御が
安定している場合には、入力されるＲ・Ｇ・Ｂの各信号
の平均値は一定となり、個々の色成分の信号の前回との
差も０となる。したがって制御用の輝度信号と個々の色
成分の前回との差を掛けた制御値は一定となり、絞りは
安定している。Now, when the brightness of the subject does not change and the aperture control is stable, the average value of the input R, G, and B signals becomes constant, and the previous signal of the individual color component signals is obtained. And the difference is 0. Therefore, the control value obtained by multiplying the difference between the control luminance signal and the previous color component is constant, and the diaphragm is stable.
【００１９】このような安定状態において、被写体の明
るさが変わったとすると、その時点で入力されているＲ
・Ｇ・Ｂのいずれかの色成分が先ず変化する（時分割な
ので全色がいきなり変化することはない）。仮にＲ成分
が変化したとすると、前回（前記安定時）のＲ成分の値
（ＹN-3 ）と現在のＲ成分の値（ＹN ）とでは差が生じ
ることとなる。前記式２においてはこの差をＡD 倍す
る。If the brightness of the subject changes in such a stable state, the R input at that time is input.
First, one of the color components G and B changes (because it is time division, all colors do not change suddenly). If the R component changes, there will be a difference between the previous R component value (Y N-3 ) and the current R component value (Y N ). In Equation 2, this difference is multiplied by A D.
【００２０】なお、このＲ成分の変化により当然、制御
用の輝度値（Ｋr ×ＹN ＋Ｋg ×ＹN-2 ＋Ｋb ×Ｙ
N-1 ）も変化することとなるが、Ｒ・Ｇ・Ｂのうちの一
つが変化しただけであるから（この場合、Ｒであ
る。）、その変化の割合は小さい。Naturally, due to the change of the R component, the brightness value for control (K r × Y N + K g × Y N-2 + K b × Y)
N-1 ) also changes, but since only one of R, G, and B has changed (in this case, R), the change rate is small.
【００２１】この輝度値に前記変化した色成分（この場
合、Ｒ成分）のＡD 倍したものを加え、さらに基準電圧
との差を算出して誤差信号を得る。そしてこの誤差信号
は−ＡV 倍され制御電圧Ｖcntlとなり、この電圧信号は
絞り駆動手段に入力される。An error signal is obtained by adding a value obtained by multiplying the changed color component (in this case, the R component) by AD to the luminance value and calculating the difference from the reference voltage. Then, this error signal is multiplied by −AV to become the control voltage Vcntl, and this voltage signal is input to the diaphragm driving means.
【００２２】次に、フィルタはＲの次の色Ｇとなる。こ
のＧ成分は前記被写体の明るさの変化に前記Ｒの変化に
伴う絞りの駆動による変化分が加わるため、このＧ成分
の変化は前記Ｒ成分の変化に比べ小さくなる。したがっ
てこのときの制御用の誤差信号は前記Ｒ時の誤差信号に
比べ多少小さくなるが、従来の制御方法よりは大きな誤
差信号が得られる。なお、この時点では既に制御データ
が小さくなるためハンチング現象等を防止し易くなる。The filter then goes to the color G next to R. Since the G component is changed by the driving of the diaphragm accompanying the change of R in addition to the change of the brightness of the subject, the change of G component is smaller than the change of the R component. Therefore, the error signal for control at this time is slightly smaller than the error signal at the time of R, but a larger error signal than the conventional control method can be obtained. At this point in time, the control data is already small, so it is easy to prevent the hunting phenomenon and the like.
【００２３】以降、同様にして（ＹN −ＹN-3 ）及び
（Ｋr ×ＹN ＋Ｋg ×ＹN-2 ＋Ｋb ×ＹN-1 ）が一定と
なり、制御電圧Ｖcntlが０となるまで各色成分毎に絞り
が駆動される。Thereafter, similarly, (Y N -Y N-3 ) and (K r × Y N + K g × Y N-2 + K b × Y N-1 ) become constant and the control voltage V cntl becomes 0. Until that time, the diaphragm is driven for each color component.
【００２４】このように本発明では、前記従来の絞り制
御と異なり変化した色成分をＡD 倍した値を制御用の輝
度値に加えることにより、より大きな制御用の誤差信号
が得られる。また、該誤差信号に基づく絞り制御を各原
色信号が得られる度毎に行うためより速やかな絞りの制
御を行える。As described above, according to the present invention, a larger control error signal can be obtained by adding a value obtained by multiplying the changed color component by A D , unlike the conventional aperture control, to the control brightness value. Further, since the aperture control based on the error signal is performed every time each primary color signal is obtained, the aperture can be controlled more quickly.
【００２５】[0025]
【実施例】本発明の実施例を図面に基いて説明すると、
図１は本発明の第１の実施例に係る絞り制御装置の構成
を示すブロック図である。同図に示すようにこの実施例
の装置は、撮像素子３から信号処理回路４を経て得られ
るＲ・Ｇ・Ｂの各色の信号を記憶するサンプルホールド
回路５，５ａ，５ｂと、現時点の入力撮像信号と前記サ
ンプルホールド回路に記憶された過去の撮像信号との差
を各色毎に算出する信号差検出回路６，６ａ，６ｂ、該
信号差検出回路による算出結果を選択的に出力する信号
差選択回路７、輝度値を算出する輝度信号作成回路８、
加算回路９、加算回路９からの出力信号と基準信号１０
との差を算出する差信号検出回路１１、差信号検出回路
１１の出力信号を増幅する増幅器１２、及び絞り駆動用
のモータ１３を備えている。なお、同図において、２は
Ｒ・Ｇ・Ｂの三原色フィルタにより構成された回転円盤
である。Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of a diaphragm control device according to the first embodiment of the present invention. As shown in the figure, the apparatus of this embodiment includes sample and hold circuits 5, 5a and 5b for storing signals of respective colors of R, G and B obtained from the image pickup device 3 through the signal processing circuit 4, and input at the present time. Signal difference detection circuits 6, 6a, 6b for calculating the difference between the image pickup signal and the past image pickup signal stored in the sample hold circuit for each color, and a signal difference for selectively outputting the calculation result by the signal difference detection circuit. A selection circuit 7, a luminance signal generation circuit 8 for calculating a luminance value,
Adder circuit 9, output signal from adder circuit 9 and reference signal 10
A difference signal detection circuit 11 for calculating a difference between the difference signal, an amplifier 12 for amplifying an output signal of the difference signal detection circuit 11, and a motor 13 for driving the diaphragm. In the figure, reference numeral 2 is a rotating disk composed of R, G, and B primary color filters.
【００２６】そして、輝度信号作成回路８で前記式２中
の輝度（Ｋr ×ＹN ＋Ｋg ×ＹN-2＋Ｋb ×ＹN-1 ）の
算出が行われ、信号差検出回路６，６ａ，６ｂで信号差
ＡD×（ＹN −ＹN-3 ）が算出され、加算回路９で該信
号差と前記輝度信号作成回路８で算出された輝度とが加
算され、この加算結果と基準電圧ＶREF との差が誤差信
号として差信号検出回路１１で算出される。この誤差信
号は増幅器１２により−ＡV 倍に増幅されて前記制御用
電圧Ｖcntlとなり、モータ１３に入力され、絞り１が駆
動される。Then, the luminance signal generating circuit 8 calculates the luminance (Kr * YN + Kg * YN- 2 + Kb * YN- 1 ) in the equation 2, and the signal difference detection circuits 6, 6a and 6b calculate the signal difference. AD × (YN −YN −3 ) is calculated, the signal difference is added by the adder circuit 9 and the brightness calculated by the brightness signal generating circuit 8, and the difference between the addition result and the reference voltage VREF is the error signal. Is calculated by the difference signal detection circuit 11. This error signal is amplified by -AV times by the amplifier 12 to become the control voltage Vcntl, which is input to the motor 13 to drive the diaphragm 1.
【００２７】図２は本発明の第２の実施例に係る絞り制
御装置の構成を示すブロック図である。この実施例の装
置は、前記第１の実施例に係る装置におけるサンプルホ
ールド回路５，５ａ，５ｂ、信号差検出回路６，６ａ，
６ｂ、信号差選択回路７、輝度信号作成回路８、及び加
算回路９に代え、マイクロコントローラ１４を用いたも
のである。このマイクロコントローラ１４はデジタルデ
ータとして各色の前回の撮像信号を記憶し、さらに必要
な演算を施し、該演算結果をＤ／Ａ変換を行って差信号
検出回路１１に出力する。このようにマイクロコントロ
ーラを用いることにより廉価な絞り制御装置を実現でき
る。FIG. 2 is a block diagram showing the arrangement of a diaphragm control device according to the second embodiment of the present invention. The device of this embodiment is similar to the device according to the first embodiment in that the sample and hold circuits 5, 5a, 5b, the signal difference detection circuits 6, 6a,
6b, the signal difference selection circuit 7, the luminance signal generation circuit 8, and the addition circuit 9 are replaced with a microcontroller 14. The microcontroller 14 stores the previous image pickup signal of each color as digital data, further performs necessary calculation, performs D / A conversion of the calculation result, and outputs the result to the difference signal detection circuit 11. By using the microcontroller in this way, an inexpensive diaphragm control device can be realized.
【００２８】図３は本発明の第３の実施例に係る絞り制
御装置の構成を示すブロック図である。この実施例の装
置は、前記第２の実施例に係る装置と同様にマイクロコ
ントローラ１４を用いたものであるが、絞り１を駆動す
るモータとしてステッピングモータ１３０を用いたもの
である。これによりフィードバック系を省くことがで
き、装置構成の簡略化が図られる。FIG. 3 is a block diagram showing the arrangement of a diaphragm control device according to the third embodiment of the present invention. The device of this embodiment uses the microcontroller 14 as in the device of the second embodiment, but uses a stepping motor 130 as a motor for driving the aperture 1. As a result, the feedback system can be omitted, and the device configuration can be simplified.
【００２９】[0029]
【発明の効果】以上説明したとおり本発明によれば、Ｒ
・Ｇ・Ｂのすべての原色信号が揃うまで絞り制御を行う
ことができなかった従来の絞り制御と異なり、一つの原
色信号が得られた時点で即座に制御用の信号が得られる
ため、従来の制御方法に比べ原理的に３倍の制御速度を
実現することができ、高速の絞り制御が可能となる。As described above, according to the present invention, R
-Unlike conventional aperture control, in which aperture control cannot be performed until all of the G and B primary color signals are complete, the control signal can be obtained immediately when one primary color signal is obtained. In principle, a control speed that is three times that of the control method described above can be realized, and high-speed aperture control can be performed.
【図１】本発明の第１の実施例に係る絞り制御装置の構
成を示すブロック図である。FIG. 1 is a block diagram showing a configuration of a diaphragm control device according to a first embodiment of the present invention.
【図２】本発明の第２の実施例に係る絞り制御装置の構
成を示すブロック図である。FIG. 2 is a block diagram showing a configuration of a diaphragm control device according to a second embodiment of the present invention.
【図３】本発明の第３の実施例に係る絞り制御装置の構
成を示すブロック図である。FIG. 3 is a block diagram showing a configuration of a diaphragm control device according to a third embodiment of the present invention.
【図４】従来の絞り制御装置の構成を示すブロック図で
ある。FIG. 4 is a block diagram showing a configuration of a conventional aperture control device.
１ 絞り ２ 回転円盤 ３ 撮像素子 ４ 信号処理回路 ５ Ｒ（赤）用サンプルホールド回路 ５ａ Ｇ（緑）用サンプルホールド回路 ５ｂ Ｂ（青）用サンプルホールド回路 ６ Ｒ用信号差検出回路 ６ａ Ｇ用信号差検出回路 ６ｂ Ｂ用信号差検出回路 ７ 信号差選択回路 ８ 輝度信号作成回路 ９ 加算回路 １０ 基準信号 １１ 差信号検出回路 １２ 増幅器 １３，１３０ 絞り駆動用モータ １４ マイクロコントローラ 尚、各図中同一符号は同一又は相当部分を示す。 1 aperture 2 rotating disks 3 image sensor 4 Signal processing circuit Sample hold circuit for 5 R (red) 5a G (green) sample and hold circuit Sample hold circuit for 5b B (blue) 6 R signal difference detection circuit 6a G signal difference detection circuit 6b B signal difference detection circuit 7 Signal difference selection circuit 8 Luminance signal generation circuit 9 adder circuit 10 Reference signal 11 Difference signal detection circuit 12 amplifier 13,130 Aperture drive motor 14 Micro controller In the drawings, the same reference numerals indicate the same or corresponding parts.
Claims (3)
像するカメラに設けられる絞りを制御する絞り制御装置
であって、 前記絞りの開口量を調整する絞り駆動手段と、 前記フィルタを通して得られた各色信号を記憶する記憶
手段と、 現在の入力色信号と、該現在の入力色信号と同一色の過
去の色信号との差に基づいて前記絞り駆動手段の駆動量
を算出する演算手段とを備え、 前記演算手段により算出された駆動量に基づいて、前記
各色の信号が得られる度毎に前記絞りの制御を行うこと
を特徴とする絞り制御装置。1. A diaphragm control device for controlling a diaphragm provided in a camera for time-divisionally capturing an image of each color with filters of three colors, comprising: diaphragm driving means for adjusting an aperture amount of the diaphragm; A storage unit that stores the obtained color signals, a calculation that calculates the drive amount of the diaphragm drive unit based on the difference between the current input color signal and the past color signal of the same color as the current input color signal Means for controlling the diaphragm every time a signal of each color is obtained, based on the driving amount calculated by the calculating means.
倍（ＡD ＞０）して前記現在の入力色信号を含む過去の
色信号から算出した輝度値に加え、 さらにこの算出結果と基準値との差に基づいて前記絞り
駆動手段の駆動量を算出するものである請求項１に記載
の絞り制御装置。2. The calculation means calculates the difference between the color signals as AD.
In addition to the luminance value calculated from the past color signal including the current input color signal by doubling (AD> 0), the driving amount of the aperture driving means is calculated based on the difference between the calculation result and the reference value. The aperture control device according to claim 1, wherein
る請求項１又は請求項２に記載の絞り制御装置。3. The aperture control device according to claim 1, wherein each of the colors is a primary color.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34102793A JP3509157B2 (en) | 1993-12-10 | 1993-12-10 | Aperture control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34102793A JP3509157B2 (en) | 1993-12-10 | 1993-12-10 | Aperture control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07162875A JPH07162875A (en) | 1995-06-23 |
| JP3509157B2 true JP3509157B2 (en) | 2004-03-22 |
Family
ID=18342550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34102793A Expired - Fee Related JP3509157B2 (en) | 1993-12-10 | 1993-12-10 | Aperture control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3509157B2 (en) |
-
1993
- 1993-12-10 JP JP34102793A patent/JP3509157B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07162875A (en) | 1995-06-23 |
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