JPS5850865A - Television camera device - Google Patents
Television camera deviceInfo
- Publication number
- JPS5850865A JPS5850865A JP56149138A JP14913881A JPS5850865A JP S5850865 A JPS5850865 A JP S5850865A JP 56149138 A JP56149138 A JP 56149138A JP 14913881 A JP14913881 A JP 14913881A JP S5850865 A JPS5850865 A JP S5850865A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- reference voltage
- video
- signal
- subject
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/75—Circuitry for compensating brightness variation in the scene by influencing optical camera components
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Exposure Control For Cameras (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は自動のレンズ紋り装置を有するテレビジョンカ
メラ装置の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a television camera apparatus having an automatic lens shading device.
従来のこの種テレビジョン装置の回路は第１図のブロッ
ク図に示す様な回路が使用されている。A circuit as shown in the block diagram of FIG. 1 is used as a conventional circuit for this type of television apparatus.
すなわち撮像管１からの出力を映像増幅回路２で増幅し
て映像信号出力端子３に出力する。一方その映像出力信
号を整流回路４で平均値整流して比果の信号にもとづき
レンズ紋りＳの開閉を制御するレンズ紋り駆動用のモー
タ駆動回路６を動作させて映像信号出力端子３に定格出
力が得られるようにした回路である。伺ＬＮはレンズで
ある。しかしながら、上記の様なテレビジョンカメラ装
置では被写体の輝度を平均値化して映像出力信号として
取り出すようにしているので、被写体のある部分に輝度
の高い部分が存在した場合、その部分の輝度に紋り回路
機構が充分には対応しきれず、従ってモニタの画面では
その部分が白つぶれ、または白ふくれ現象を起（シ、大
変見にくい画面となってしまう欠点がある。That is, the output from the image pickup tube 1 is amplified by the video amplification circuit 2 and output to the video signal output terminal 3. On the other hand, the video output signal is rectified to an average value by the rectifier circuit 4, and a motor drive circuit 6 for driving the lens fringes, which controls the opening and closing of the lens fringes S based on the signal of the ratio, is operated to output the video signal to the video signal output terminal 3. This circuit is designed to provide the rated output. The LN is a lens. However, in the above-mentioned television camera device, the brightness of the subject is averaged and extracted as a video output signal, so if a certain part of the subject has a high brightness, the brightness of that part will vary. The circuit mechanism is not able to fully cope with this, and as a result, the monitor screen has the disadvantage of causing whitewashing or blistering (which makes the screen very difficult to see).
本発明は上記従来の欠点に鑑み提案されたものであり、
映像信号出力を平均値整流した電圧として演算増幅回路
に入力させ、予め定められた演算増幅回路の第１の基準
電圧と比較し、その結果に基づきレンズ紋り装置を駆動
制御する回路手段を有するとともに、前記映像出力信号
をスイッチ手段を介して尖頭値整流および増幅し、その
増幅された信号を反転し所望の大きさの信号電圧にして
前記演算増幅回路の第２の基準電圧とし、前記平均値整
流した電圧と比較し、前記レンズ紋り装置を駆動制御す
る回路手段を有する構成とすることにより、平均値が一
定の映像出力を得ることができるとともに必要により切
換スイッチを操作することにより、映像出力信号を尖頭
（ピーク）値整流し、この信号を反転して可変要素を介
し演算増幅回路の第２の基準電圧として使用し、もって
被写体の輝度が部分的に高い場合でも尖頭値が一定の映
像出力が映像量カー号端子に得られるようにしたテレビ
ジョン装置を提供するものである。The present invention has been proposed in view of the above-mentioned conventional drawbacks,
It has circuit means for inputting the video signal output as an average value rectified voltage to the operational amplifier circuit, comparing it with a predetermined first reference voltage of the operational amplifier circuit, and driving and controlling the lens fogging device based on the result. At the same time, the video output signal is peak-value rectified and amplified through a switch means, the amplified signal is inverted and made into a signal voltage of a desired magnitude, which is used as the second reference voltage of the operational amplifier circuit, and By comparing the voltage rectified with the average value and having a circuit means for driving and controlling the lens fogging device, it is possible to obtain a video output with a constant average value, and if necessary, by operating a changeover switch. , the video output signal is rectified to its peak value, and this signal is inverted and used as the second reference voltage of the operational amplifier circuit through a variable element. To provide a television device in which a video output having a constant value can be obtained at a video quantity signal terminal.
以下本発明の一実施例を第２図とともに詳細に説明する
。An embodiment of the present invention will be described in detail below with reference to FIG.
第２図において第１図と同一記号は同一物品を表わすも
のであり、・１は撮像管、２は映像増幅回路、３は映像
出力信号端子、４はダイオードハ、コンデンサＣ１、抵
抗ルで構成された平均値整流回路。６は前記平均値整流
回路５で整流された信号電圧を一方の゛入力とし、その
他方の入力には基準電圧発生回路１１で予め定めた電圧
が印加されるか、後述する尖頭（ピーク）値整流された
信号電圧の反転信号が第２の基準電圧として印加される
比較演算回路である。In Figure 2, the same symbols as in Figure 1 represent the same items; 1 is an image pickup tube, 2 is a video amplification circuit, 3 is a video output signal terminal, 4 is a diode, a capacitor C1, and a resistor. average value rectifier circuit. 6 has one input as the signal voltage rectified by the average value rectifier circuit 5, and the other input is applied with a voltage predetermined by the reference voltage generation circuit 11, or with a peak voltage as described later. This is a comparison calculation circuit to which an inverted signal of the value-rectified signal voltage is applied as a second reference voltage.
６は、レンズ紋り開閉用のモータ駆動回路で、前記比較
演算回路の信号によって駆動され、レンズ紋りＳを開閉
制御する。ＬＮはレンズである。Reference numeral 6 denotes a motor drive circuit for opening and closing the lens rim, which is driven by the signal from the comparison calculation circuit and controls opening and closing of the lens rim S. LN is a lens.
ＳＷは切換スイッチで一端は映像＃１３出が線に接続さ
れている。７は前記切換スイッチＳＷ、の他端゛に接続
され、該切換スイッチＳＷを介して入力する映像信号出
力を尖頭値整流する整流回路である。SW is a changeover switch, and one end of which the video #13 output is connected to the line. Reference numeral 7 denotes a rectifier circuit connected to the other end of the changeover switch SW, which performs peak value rectification of the video signal output input via the changeover switch SW.
８は直流増幅回路で、前記整流回路７で尖頭値整流され
た信号電圧を増幅する直流増幅回路。９は反転回路で前
記直流増幅回路８の出力信号を反転して可変抵抗ＶＴＬ
、により構成された基準電圧調整回路１０へ反転信号を
送出するものである。そして基準電圧調整回路ｌＯは前
記比較演算回路５の他方の端子（すなわち基準電圧を印
加する端子）に第２の基準電圧を送出するものである。8 is a DC amplification circuit which amplifies the signal voltage rectified to a peak value by the rectifier circuit 7; 9 is an inverting circuit which inverts the output signal of the DC amplifier circuit 8 and connects it to a variable resistor VTL.
, which sends an inverted signal to the reference voltage adjustment circuit 10 configured by . The reference voltage adjustment circuit IO sends out a second reference voltage to the other terminal of the comparison calculation circuit 5 (ie, the terminal to which the reference voltage is applied).
伺この基準電圧整流回路１０はレンズ紋りユニットの側
に設置シテモ良いし、テレビジョンカメラ本体に設置し
ても良いものであり、この実施例ではテレビジョンカメ
ラ本体に設置した例を示してあシ、これによると調整の
しにくいレンズ紋りユニット側で電圧を調整する手間が
省ける。以上の構成においてその動作を説明する。This reference voltage rectifier circuit 10 can be installed on the side of the lens print unit, or it can be installed on the television camera body, and in this embodiment, an example where it is installed on the television camera body is shown. This eliminates the need to adjust the voltage on the lens print unit, which is difficult to adjust. The operation of the above configuration will be explained.
まず、図示の如く切換スイッチＳＷが０ＦＦ（開）の状
態で被写体の輝度が均一のものを撮像した場合はレンズ
ＬＮ、レンズ紋りＳを通り、撮像管に達した光は電気信
号に変換されて映像増幅回路２を通９増幅され、平均値
整流回路４に入力し平均値整流され比較演算回路５の一
方の端子に入力する。他方の入力端子には、映像信号出
力端子３に定格出力信号を得るのに適した第１の基準電
圧が基準電圧発生回路１１より印加されているので、前
記平均値整流された信号電圧が第１の基準電圧に等しく
なるようレンズ紋りが駆動回路６を介して開閉制御され
撮像管１に入光する光量を調整し、映像信号出力端子３
に定格出力信号を得るように動作するものである。この
場合切換スイッチＳＷは０ＦＰｔ’あルノテ、以降の各
回路７．８．９．１０は動作しない。ところでこの切換
スイッチがＯＦＦの状態で被写体のほぼ半分位に輝度の
高い光の部分があり、この被写体を撮像した場合、映像
信号出力は平均値整流回路４で整流され、比較演算回路
５で第１の基準電圧と比較演算され、当該第１の基準電
圧と同じになるようにレンズ紋り機構を動作させるので
あるが、比較電圧発生手段は映像出力信号の平均値であ
るため、平均値が一定である映像出力が得られるため、
映像信号出力の尖頭値は、被写体全体が明るい場合に較
べその尖頭値は２倍の値と々るため従ってモニターでは
その輝度の高い光の部分が白つぶれ又は白ぶくれとなっ
て表われ、鮮明な画面がみられない。この様な場合には
切換スイ、クチＳＷをＯＮ（閉）として映像出力信号を
尖頭値整流回路７に入力させて尖頭値整流し、この信号
電圧を直流増幅回路８で増幅したのち、反転回路９に入
力させ、その信号電圧を反転させて、基準電圧調整回路
１０を介して前述の比較演算回路５の基準とすることに
よって映像出力信号端子３に尖頭値が一定な映像出力信
号を得ることができるものである。First, as shown in the figure, when the changeover switch SW is set to 0FF (open) and a subject with uniform brightness is imaged, the light that passes through the lens LN and the lens pattern S and reaches the image pickup tube is converted into an electrical signal. The signal is amplified through the video amplification circuit 2, inputted to the average value rectification circuit 4, rectified by average value, and inputted to one terminal of the comparison calculation circuit 5. Since the first reference voltage suitable for obtaining a rated output signal at the video signal output terminal 3 is applied from the reference voltage generation circuit 11 to the other input terminal, the average value rectified signal voltage is applied to the first reference voltage. The opening and closing of the lens pattern is controlled via the drive circuit 6 to adjust the amount of light entering the image pickup tube 1 so that it is equal to the reference voltage of the video signal output terminal 3.
It operates to obtain the rated output signal. In this case, the changeover switch SW is set to 0FPt', and the following circuits 7.8.9.10 do not operate. By the way, when this changeover switch is OFF and there is a high-brightness light area in about half of the object, and this object is imaged, the video signal output is rectified by the average value rectification circuit 4, and the video signal output is rectified by the average value rectification circuit 4, and then The comparison calculation is made with the first reference voltage, and the lens pattern mechanism is operated so that it becomes the same as the first reference voltage.However, since the comparison voltage generating means is the average value of the video output signal, the average value is Since a constant video output can be obtained,
The peak value of the video signal output is twice as high as when the entire subject is bright, so the high-brightness light area appears as whitewash or white blisters on the monitor. I can't see a clear screen. In such a case, turn on (close) the switch switch and the tip SW to input the video output signal to the peak value rectifier circuit 7 for peak value rectification, and after amplifying this signal voltage in the DC amplifier circuit 8, A video output signal with a constant peak value is supplied to the video output signal terminal 3 by inputting it to the inverting circuit 9, inverting the signal voltage, and using it as a reference for the above-mentioned comparison calculation circuit 5 via the reference voltage adjustment circuit 10. This is something that can be obtained.
すなわち、切換スイッチＯＮで、映像出力信号は尖頭値
整流および増幅された信号が反転回路９で反転されるの
で、比較演算増幅回路５に印加される基準電圧は、被写
体の輝度の高い部分に比例して、その基準電圧が変化す
るので、平均値整流された電圧は容易にその基準電圧と
一致するようにレンズ紋り機構を動作させることが出来
るので映像信号出力端子３には定格（白つぶれ等のない
）の映像出力信号を得ることができるように六つだので
ある。同本発明では基準電圧調整回路１０の可変抵抗で
反転回路９の出力を調整できるようにしであるので、被
写体の輝度の割合いに応じ紋り機構の微調整がより容易
に行えるものである。That is, when the changeover switch is turned on, the video output signal is peak-value rectified and amplified, and the signal is inverted by the inverting circuit 9, so that the reference voltage applied to the comparison arithmetic amplifier circuit 5 is applied to the high-luminance part of the subject. Since the reference voltage changes proportionally, the average rectified voltage can easily operate the lens shading mechanism to match the reference voltage. There are six of them so that it is possible to obtain a video output signal with no distortion, etc. In the present invention, since the output of the inverting circuit 9 can be adjusted by the variable resistor of the reference voltage adjusting circuit 10, it is easier to finely adjust the fringing mechanism according to the brightness ratio of the subject.
以上の通り本発吋によればテレビジョンカメラ装置に映
像信号出力の平均値でレンズ紋り機構を動作させる回路
手段と映像出力信号を尖頭値整流し、これを反転させた
出力信号と前述の映像信号出力の平均値め信号とを比較
して、レンズ紋り機構を動作させるとともに切換スイッ
チ手段で尖頭値整流回路以降の回路を任意にＯＮ、ＯＦ
Ｆ動作できるようにしたので、被写体の輝度の状態に最
も適した状態にレンズ紋り機構をセットさせることがで
きるようになったので大変に使用用途の広いテレビジョ
ンカメラ装置を提供できたのである。As described above, according to the present invention, there is provided a circuit means for operating a lens shading mechanism using the average value of the video signal output in the television camera device, a peak value rectification of the video output signal, and an output signal obtained by inverting the rectified video signal. The average value of the video signal output is compared with the average value signal of the video signal output, and the lens shading mechanism is operated, and the circuits after the peak value rectifier circuit are arbitrarily turned on and off using the changeover switch means.
By making it possible to perform F operation, it became possible to set the lens shading mechanism to the state most suitable for the brightness of the subject, making it possible to provide a television camera device with a wide range of uses. .
第１図は従来のテレビジョンカメラの一実施例ブロック
図。
第２図は本発明のテレビジョンカメラの一実施例のブロ
ック図である。
１・・・撮像管、２ 映像増幅回路、４・・・平均値整
流回路、５ 比較演算回路、７ 尖頭値整流回路、９・
・反転回路、Ｓ・・・レンズ紋りっ特許出願人 光洋電
子工業株式会社FIG. 1 is a block diagram of an embodiment of a conventional television camera. FIG. 2 is a block diagram of an embodiment of the television camera of the present invention. DESCRIPTION OF SYMBOLS 1... Image pickup tube, 2 Image amplification circuit, 4... Average value rectification circuit, 5 Comparison calculation circuit, 7 Peak value rectification circuit, 9.
・Inversion circuit, S...lens pattern Patent applicant Koyo Electronics Industry Co., Ltd.
Claims (1)
御し、映像信号出力端子に定格出方が得られるようにし
たテレビジョンカメラにおいて、・映像信号出力を平均
値整流した電圧として演算増幅回路に入力させ、予め定
められた演算増幅回路の第１の基準電圧と比較し、その
結果に基づきレンズ紋り装置を駆動制御する回路手段を
有するとともに、前記映像出力信号をスイッチ手段を介
して尖頭値整流および増幅し、その増幅された信号を反
転し所望の大きさの信号電圧にして前記演算増幅回路の
第２の基準電圧とし、前記平均値整流した電圧と比較し
前記レンズ紋り装置を駆動制御する回路手段を有するテ
レビジョンカメラ装置。In a television camera in which a lens shading device is controlled by the video signal output from the image pickup tube so that the rated output is obtained at the video signal output terminal, the video signal output is converted to an average rectified voltage and sent to the operational amplifier circuit. The video output signal is inputted and compared with a first reference voltage of a predetermined operational amplifier circuit, and the lens fogging device is driven and controlled based on the result. value rectification and amplification, and inverting the amplified signal to obtain a signal voltage of a desired magnitude, which is used as the second reference voltage of the operational amplifier circuit, and comparing it with the average value rectified voltage to control the lens patterning device. A television camera device having circuit means for drive control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56149138A JPS5850865A (en) | 1981-09-21 | 1981-09-21 | Television camera device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56149138A JPS5850865A (en) | 1981-09-21 | 1981-09-21 | Television camera device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5850865A true JPS5850865A (en) | 1983-03-25 |
Family
ID=15468577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56149138A Pending JPS5850865A (en) | 1981-09-21 | 1981-09-21 | Television camera device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5850865A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60165180A (en) * | 1984-02-06 | 1985-08-28 | Canon Inc | Comparator of exposure controller |
| JPS61109433U (en) * | 1984-12-21 | 1986-07-11 | ||
| JPH04333604A (en) * | 1991-04-30 | 1992-11-20 | Sumitomo Rubber Ind Ltd | Glove and production thereof |
-
1981
- 1981-09-21 JP JP56149138A patent/JPS5850865A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60165180A (en) * | 1984-02-06 | 1985-08-28 | Canon Inc | Comparator of exposure controller |
| JPS61109433U (en) * | 1984-12-21 | 1986-07-11 | ||
| JPH04333604A (en) * | 1991-04-30 | 1992-11-20 | Sumitomo Rubber Ind Ltd | Glove and production thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR870006789A (en) | White Balance Adjuster for Color Video Cameras | |
| US3086077A (en) | Television camera regulating system | |
| JPS5850865A (en) | Television camera device | |
| FR2683414A1 (en) | Contrast and brightness control for a television receiver with teletext | |
| KR100227678B1 (en) | Luminance signal control circuit of image signal | |
| JPH0576829B2 (en) | ||
| JPS59108455A (en) | Automatic stop controller of automatic stop lens for cctv camera | |
| US4933750A (en) | Auto-master pedestal control circuit | |
| JP2613747B2 (en) | White balance adjustment device | |
| JPS626580A (en) | Picture signal processing circuit | |
| JP2631217B2 (en) | Automatic exposure control device | |
| JPH07194528A (en) | Image pick-up device | |
| JP2551644B2 (en) | Image signal processing device for endoscope | |
| JPH01170914A (en) | Light source device for endoscope | |
| JPS58129587A (en) | Signal processing circuit | |
| JPS59174073A (en) | Aperture controller of video camera | |
| JPH0232832B2 (en) | ||
| JPH0553373U (en) | Video signal level control device | |
| KR930002367Y1 (en) | Reverse-light compensative circuit | |
| JP2547273B2 (en) | Flicker removal circuit for imaging device | |
| KR890000780B1 (en) | The automatic control method of the iris for the camera | |
| JPH04345280A (en) | Circuit for controlling exposure in video camera | |
| JPH04362878A (en) | Automatic diaphragm apparatus | |
| JPH02141733A (en) | Automatic exposure controller | |
| JPH04248794A (en) | White balance controller for video camera |