JP2504939B2 - Imaging device - Google Patents
Imaging deviceInfo
- Publication number
- JP2504939B2 JP2504939B2 JP59097584A JP9758484A JP2504939B2 JP 2504939 B2 JP2504939 B2 JP 2504939B2 JP 59097584 A JP59097584 A JP 59097584A JP 9758484 A JP9758484 A JP 9758484A JP 2504939 B2 JP2504939 B2 JP 2504939B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- image pickup
- brightness level
- level
- 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
- 238000003384 imaging method Methods 0.000 title claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims 2
- 230000003287 optical effect Effects 0.000 claims 1
- 238000005070 sampling Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000001629 suppression Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003111 delayed effect Effects 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
- 210000003127 knee Anatomy 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Processing Of Color Television Signals (AREA)
Description
【発明の詳細な説明】 〔技術分野〕 この発明は、レンズの絞りを用いたビデオカメラにお
けるバツクライトを制御する撮像装置に関するものであ
る。Description: TECHNICAL FIELD The present invention relates to an image pickup apparatus for controlling backlight in a video camera using a diaphragm of a lens.
従来、撮像装置として第１図に示すものがある。 BACKGROUND ART Conventionally, there is an image pickup apparatus shown in FIG.
図において、１は撮像管等の撮像系で、その映像信号
Ｓ出力はプリアンプ２によつて前置増幅され、次段のγ
補正回路３へ送られγ補正がなされる。次に、この補正
された映像信号S1をAGC回路４で自動的に利得を調整す
る。その出力は、低域通過フイルタ（以下LPFという）
５へ送られ、このLPF5によつて映像信号S1から輝度信号
Ｙが分離される。この輝度信号Ｙは信号プロセス回路７
を介してNTSCエンコーダ７へ送られる。一方、前述のAG
C回路４の出力側に配置された帯域通過フイルタ（以下B
PFという）８により、映像信号S1から色信号Ｒを分離
し、信号プロセス回路９を介してNTSCエンコーダ７へ送
られ、このNTSCエンコーダ７の出力端子7aよりNTSC信号
が得られる。In the figure, reference numeral 1 denotes an image pickup system such as an image pickup tube, and its video signal S output is pre-amplified by a preamplifier 2 so that γ of the next stage
It is sent to the correction circuit 3 and γ correction is performed. Next, the gain of the corrected video signal S 1 is automatically adjusted by the AGC circuit 4. The output is a low-pass filter (hereinafter referred to as LPF).
5, the luminance signal Y is separated from the video signal S 1 by the LPF 5. This luminance signal Y is sent to the signal processing circuit 7
Is sent to the NTSC encoder 7 via. On the other hand, the above-mentioned AG
A band pass filter (hereinafter referred to as B
The color signal R is separated from the video signal S 1 by the PF 8 and is sent to the NTSC encoder 7 via the signal processing circuit 9, and the NTSC signal is obtained from the output terminal 7a of the NTSC encoder 7.
10は自動光量制御回路（以下ALCという）で、前述の
プリアンプ２の出力側に接続され、映像信号Ｓを平均し
て次段の絞り駆動回路11へ送出している。この絞り駆動
回路11は制御回路12により制御され、ALC10よりの信号
に基づいて絞り13を駆動している。すなわち、バツクラ
イトの強度が大きくALC10よりの信号レベルが高いとき
は、絞り13を閉じ、逆にバツクライトの強度が小さけれ
ば開くようにしてバツクライトの強度を補正している。Reference numeral 10 denotes an automatic light amount control circuit (hereinafter referred to as ALC), which is connected to the output side of the above-mentioned preamplifier 2 and averages the video signal S to send it to the diaphragm drive circuit 11 in the next stage. The diaphragm drive circuit 11 is controlled by the control circuit 12 and drives the diaphragm 13 based on the signal from the ALC 10. That is, when the back light intensity is high and the signal level from the ALC 10 is high, the diaphragm 13 is closed, and conversely, when the back light intensity is low, the back light is opened to correct the back light intensity.
ところが、このような従来の撮像装置においては、例
えば、絞りを開放側に制御して入射光量を増すように制
御した場合は、出力信号のレベルは高くなるが、AGC回
路４により再びそのレベルが抑圧されてしまう。このた
め、本来レベルを高くしたい被写体部分の信号だけをレ
ベルアツプできないので、充分な逆光補正ができないと
いう欠点があつた。However, in such a conventional image pickup device, for example, when the diaphragm is controlled to the open side to increase the incident light amount, the level of the output signal increases, but the AGC circuit 4 changes the level again. It will be suppressed. For this reason, the level of only the signal of the object portion whose level is originally desired to be increased cannot be level-up, so that there is a drawback that sufficient backlight compensation cannot be performed.
この発明は、上述の欠点に着目してなされたもので、
映像信号のうち重要な被写体に対応する部分の信号レベ
ルを高くし、一方、バツクライト部分に対応する信号レ
ベルを抑圧することによつて本来レベルアツプしたい部
分の信号だけを増大し、充分な逆光補正ができる撮像装
置を提供することを目的とする。The present invention was made by focusing on the above-mentioned drawbacks,
By increasing the signal level of the part of the video signal that corresponds to an important subject, while suppressing the signal level that corresponds to the backlight part, only the signal of the part that you want to level up is increased, and sufficient backlight compensation is performed. It is an object of the present invention to provide an imaging device capable of performing the above.
以下この発明の実施例を第２図なしい第５図に基づい
て説明する。なお、従来例と同一または相当部分は同一
符号を付し、その詳細は省略する。An embodiment of the present invention will be described below with reference to FIG. 2 and FIG. Note that the same or corresponding parts as those of the conventional example are designated by the same reference numerals, and the details thereof are omitted.
〔第１実施例〕 第２図はこの発明の第１の実施例である撮像装置のブ
ロツク図である。図において、Ａは撮像管等の撮像系１
より得られる映像信号Ｓの輝度レベルに応じて絞り13を
制御する自動絞り手段、Ｂは映像信号Ｓの輝度レベルを
補正する輝度レベル補正手段、Ｃは映像信号Ｓから被写
体部の信号Ｌをサンプリングし、輝度差に応じて前記補
正手段Ｂおよび駆動手段Ａを制御する制御手段、Ｄはこ
の制御手段Ｃへサンプリング信号を送出するためのサン
プリング信号送出手段であり、上記輝度レベル補正手段
Ｂ、制御手段Ｃおよびサンプリング信号送出手段Ｄと
で、絞り補正手段としての絞り補正回路12により絞り13
が補正されている間所定のレベル以上の映像信号のみを
抑圧する抑圧手段を構成している。[First Embodiment] FIG. 2 is a block diagram of an image pickup apparatus according to the first embodiment of the present invention. In the figure, A is an image pickup system 1 such as an image pickup tube.
The automatic diaphragm means for controlling the diaphragm 13 according to the brightness level of the obtained video signal S, B is the brightness level correction means for correcting the brightness level of the video signal S, and C is the sampling of the signal L of the object portion from the video signal S. However, the control means for controlling the correction means B and the drive means A according to the brightness difference, D is a sampling signal sending means for sending a sampling signal to the control means C, and the brightness level correction means B, control With the means C and the sampling signal sending means D, the diaphragm 13 is formed by the diaphragm correction circuit 12 as diaphragm correction means.
A suppression means is configured to suppress only a video signal having a predetermined level or higher while is corrected.
前記自動絞り手段ＡはALC10と、絞り駆動回路11と、
制御回路12とより成る。輝度レベル補正手段Ｂは、γ補
正回路３と、このγ補正回路３の補正値を切換えるγ値
変更回路14とより成る。制御手段Ｃは、プリアンプ２に
接続したスイツチ15に接続されたサンプルホールド回路
16と、同じくスイツチ15と、このスイツチ15に接続され
たピークホールド回路17と、このピークホールド回路17
および前記サンプルホールド回路17の出力側に接続され
た差動増幅器18とより成る。サンプリング信号送出手段
Ｄは、垂直同期信号生成回路19と、これに接続された単
安定マルチバイブレータ20と、サンプリングパルス生成
回路21とより成る。22はNTSCエンコーダ７の出力側に設
けた加算器であり、垂直同期信号生成回路19に接続され
ている。前述の自動絞り手段Ａは、絞り13を連続的に変
化するように構成されている。The automatic diaphragm means A includes an ALC 10, an diaphragm drive circuit 11,
And a control circuit 12. The brightness level correcting means B comprises a γ correction circuit 3 and a γ value changing circuit 14 for switching the correction value of the γ correction circuit 3. The control means C is a sample hold circuit connected to the switch 15 connected to the preamplifier 2.
16, a switch 15, a peak hold circuit 17 connected to the switch 15, and a peak hold circuit 17
And a differential amplifier 18 connected to the output side of the sample and hold circuit 17. The sampling signal sending means D comprises a vertical synchronizing signal generating circuit 19, a monostable multivibrator 20 connected to the vertical synchronizing signal generating circuit 19, and a sampling pulse generating circuit 21. Reference numeral 22 denotes an adder provided on the output side of the NTSC encoder 7, which is connected to the vertical synchronization signal generation circuit 19. The automatic diaphragm means A described above is configured to continuously change the diaphragm 13.
次に作用を説明する。 Next, the operation will be described.
先ず、垂直同期信号生成回路19で生成された垂直同期
信号は、加算器22へ送出されると同時に単安定マルチバ
イブレータ20に送られる。すると、この単安定マルチバ
イブレータ20は、垂直同期信号に対して所定時間だけ遅
れた一定幅のパルスを生成する。このパルスはサンプリ
ングパルス生成回路21に入力され、このパルスに基づい
てサンプリングパルスが生成され、次段のサンプルホー
ルド回路16へ送出される。この時、制御手段Ｃのスイツ
チ15が閉じられていると、撮像系１よりの映像信号Ｓが
サンプリングされる。これは、第３図（ロ）に示す画面
中央に対応する区間Ｔだけ行われる。これにより、同図
（イ）に示す映像信号Ｓのうち被写体部に相当する映像
信号S3がサンプルホールド回路16によりサンプリングさ
れる。一方、ピークホールド回路17により映像信号S1の
ピーク値、すなわちバツクライト部に相当する映像信号
S4の最大値Ｐがピークホールド回路17により保持され
る。このピークホールド回路17と、先のサンプルホール
ド回路17の出力は、おのおの差動増幅器18の反転入力端
子、非反転入力端子に入力される。すると、この差動増
幅器18より、入力信号の差すなわち、映像信号Ｓの被写
体部と、バツクライト部の輝度差に応じた出力信号が送
出される。この出力信号は、輝度レベル補正手段Ｂのγ
値変更回路14と、自動絞り手段Ａの制御回路12に入力さ
れる。すると、先のγ値変更回路14が作動し、γ補正回
路３のγ補正値が切換えられる。一方、自動絞り手段Ａ
の制御回路12により、差動増幅回路18の出力信号に基づ
いて適宜絞り駆動回路11が制御され、絞り13より入射さ
れる光量の調節が行われる。First, the vertical synchronizing signal generated by the vertical synchronizing signal generating circuit 19 is sent to the adder 22 and simultaneously to the monostable multivibrator 20. Then, the monostable multivibrator 20 generates a pulse having a constant width delayed by a predetermined time with respect to the vertical synchronizing signal. This pulse is input to the sampling pulse generation circuit 21, a sampling pulse is generated based on this pulse, and sent to the sample hold circuit 16 of the next stage. At this time, if the switch 15 of the control means C is closed, the video signal S from the image pickup system 1 is sampled. This is performed only in the section T corresponding to the center of the screen shown in FIG. As a result, of the video signals S shown in FIG. 9A, the video signal S 3 corresponding to the subject portion is sampled by the sample hold circuit 16. On the other hand, the peak hold circuit 17 causes the peak value of the video signal S 1 , that is, the video signal corresponding to the backlight unit.
The maximum value P of S 4 is held by the peak hold circuit 17. The outputs of the peak hold circuit 17 and the sample hold circuit 17 are input to the inverting input terminal and the non-inverting input terminal of each differential amplifier 18. Then, the differential amplifier 18 outputs an output signal corresponding to the difference between the input signals, that is, the brightness difference between the subject portion of the video signal S and the backlight portion. This output signal is γ of the brightness level correction means B.
It is input to the value changing circuit 14 and the control circuit 12 of the automatic diaphragm means A. Then, the γ value changing circuit 14 is operated, and the γ correction value of the γ correction circuit 3 is switched. On the other hand, the automatic diaphragm means A
The control circuit 12 controls the diaphragm drive circuit 11 as appropriate based on the output signal of the differential amplifier circuit 18, and adjusts the amount of light incident from the diaphragm 13.
γ補正値の切換えは、例えば、バツクライト部の信号
強度が被写体部の信号に比し過大であるときは、第４図
破線Y0で示すγ特性となるように切換を行う。なお、
Vi，V0はγ補正回路３の入出力信号を示す。また、バツ
クライト部の信号が被写体部の信号の強度に比しそれほ
ど大きくないときは、第４図実線X0で示すγ特性をもつ
ように切換えが行われる。The γ correction value is switched so that, for example, when the signal intensity of the backlight unit is excessive as compared with the signal of the subject unit, the γ characteristic is represented by the broken line Y 0 in FIG. In addition,
V i and V 0 represent input / output signals of the γ correction circuit 3. Further, when the signal of the backlight unit is not so large as compared with the intensity of the signal of the object unit, the switching is performed so as to have the γ characteristic shown by the solid line X 0 in FIG.
第３図（ハ）はγ補正値を切換えない場合の信号波形
を示す。図から判るように、絞り13が開かれることによ
り被写体部の映像信号S3はレベルアツプされるが、バツ
クライト部もレベルアツプされてしまうので、バツクラ
イト部の信号Ｐが強すぎる。第３図（ニ）は、映像信号
Ｓのバツクライト部の信号Ｐ、すなわち高輝度部だけを
圧縮するようにγ補正された波形を示す。この信号を、
抑圧手段としてのAGC回路４等を通過させると、第３図
（ホ）に示す波形の映像信号が得られる。この波形図よ
り判るように、高輝度成分であるバツクライト部の信号
Ｐは圧縮され、被写体部の信号Ｌはレベルアツプされ
る。FIG. 3C shows the signal waveform when the γ correction value is not switched. As can be seen from the figure, when the diaphragm 13 is opened, the video signal S 3 of the subject portion is level-up, but the backlight portion is also level-up, so the signal P of the backlight portion is too strong. FIG. 3D shows a waveform P that is γ-corrected so as to compress only the signal P of the backlight portion of the video signal S, that is, the high-luminance portion. This signal
When the signal is passed through the AGC circuit 4 or the like as the suppressing means, the video signal having the waveform shown in FIG. 3 (e) is obtained. As can be seen from this waveform diagram, the signal P of the backlight unit, which is a high-luminance component, is compressed, and the signal L of the subject is level-up.
このようにして、バツクライト部と被写体部の信号強
度差、すなわち、輝度レベル差に応じてγ補正が適宜行
われる。なお、上記γ補正値は、輝度レベル差に応じて
連続的に変化させることにより精度よく補正できること
は勿論である。In this way, γ correction is appropriately performed according to the difference in signal intensity between the backlight unit and the subject, that is, the difference in brightness level. It is needless to say that the γ correction value can be accurately corrected by continuously changing the γ correction value according to the brightness level difference.
〔第２実施例〕 上述の第１の実施例では、γ補正回路３の補正値を切
換えてバツクライト部の映像信号を圧縮するように補正
するものであつたが、このバツクライト部をγ補正する
前にクリツプして抑圧しても良い。[Second Embodiment] In the first embodiment described above, the correction value of the γ correction circuit 3 is switched to perform correction so as to compress the video signal of the back light unit. However, the back light unit is γ corrected. You may clip and suppress before.
次に、クリツプ回路30を用いてバツクライト部の圧縮
補正を行う第２の実施例について説明する。なお、輝度
レベル補正手段Ｆ以外は、第１の実施例と全く同様であ
るので、ここでは補正手段Ｆを重点的に説明する。Next, a second embodiment will be described in which the clip circuit 30 is used to perform compression correction of the backlight unit. It should be noted that, except for the brightness level correcting means F, since it is exactly the same as that of the first embodiment, the correcting means F will be mainly described here.
輝度レベル補正手段Ｆは、前述のクリツプ回路30と、
このクリツプ回路30を制御するクリツプレベルコントロ
ール回路31およびγ補正回路３とより成る。クリツプレ
ベルコントロール回路31は、制御手段Ｃの差動増幅器18
の出力側に接続されており、この差動増幅器18の出力信
号に基づいて映像信号Ｓのバツクライト部をクリツプす
る。尚、γ補正回路、クリツプ回路以外にもKNEE回路等
によつて抑圧しても良い。又、画面の一部の値とピーク
値の差に応じて抑圧を制御しているが、単に逆光補正時
に映像信号の所定レベル以上の成分を抑圧するようにし
ても良く、本発明はこのようなものも含む。The brightness level correction means F includes the above-mentioned clip circuit 30 and
It comprises a clip level control circuit 31 for controlling the clip circuit 30 and a γ correction circuit 3. The clip level control circuit 31 includes a differential amplifier 18 of the control means C.
Connected to the output side of the differential amplifier 18 and clips the back light portion of the video signal S based on the output signal of the differential amplifier 18. Note that the KNEE circuit or the like may be used instead of the γ correction circuit and the clip circuit. Further, although the suppression is controlled according to the difference between the partial value of the screen and the peak value, it is also possible to simply suppress the component of the video signal at a predetermined level or higher during backlight compensation. Including the thing.
以上説明したように、本発明によれば、逆光時に、自
動的に、非直線変換特性の切り換えと絞りの補正を行う
ことにより、画像の中央部分も周辺部分も適正なレベル
の信号とし、充分な逆光補正を行うことができる。As described above, according to the present invention, at the time of backlighting, the nonlinear conversion characteristic is automatically switched and the aperture is corrected, so that the central portion and the peripheral portion of the image have appropriate level signals, and It is possible to perform a proper backlight correction.
第１図は従来の撮像装置のブロツク図、第２図はこの発
明に係る撮像装置のブロツク図、第３図（イ），
（ロ），（ハ），（ニ），（ホ）はこの発明に係る信号
波形図、第４図はこの発明に係るγ補正回路の特性図、
第５図はこの発明の第２の実施例を示す撮像装置のブロ
ツク図である。 Ａ……自動絞り手段 B,F……輝度レベル補正手段 Ｃ……制御手段 Ｄ……サンプリング信号送出手段 Ｅ……抑圧手段 ４……自動利得制御手段としてのAGC回路 12……絞り補正手段FIG. 1 is a block diagram of a conventional image pickup device, FIG. 2 is a block diagram of the image pickup device according to the present invention, and FIG.
(B), (c), (d), and (e) are signal waveform diagrams according to the present invention, FIG. 4 is a characteristic diagram of the γ correction circuit according to the present invention,
FIG. 5 is a block diagram of an image pickup apparatus showing a second embodiment of the present invention. A ... Automatic diaphragm means B, F ... Luminance level correcting means C ... Control means D ... Sampling signal sending means E ... Suppressing means 4 ... AGC circuit as automatic gain controlling means 12 ... Aperture correcting means
Claims (1)
段と、 該撮像手段へ入射する光量を可変制御する絞り手段と、 前記撮像信号を非直線変換する非直線変換手段と、 前記撮像信号中の中央部分の輝度レベルと全体の輝度レ
ベルのピークを比較することによって前記全体の輝度レ
ベルのピークが前記中央部分の輝度レベルに比して所定
レベルよりも大きい場合には逆光状態であると検出する
逆光検出手段と、 該逆光検出手段によって逆光状態であることが検出され
た場合に、前記絞り手段をより開放するよう制御するこ
とにより前記中央部分の輝度レベルをアップさせるよう
に補正すると共に、前記非直線変換手段における非直線
変換特性を切り換えることにより高輝度部分の信号をよ
り強く抑圧するよう制御する補正手段と、 を有することを特徴とする撮像装置。1. An image pickup means for forming an image pickup signal based on an optical image, a diaphragm means for variably controlling an amount of light incident on the image pickup means, a non-linear conversion means for non-linearly converting the image pickup signal, and the image pickup signal. By comparing the brightness level of the central part of the inside and the peak of the overall brightness level, if the peak of the overall brightness level is higher than a predetermined level as compared with the brightness level of the central part, it means that there is a backlight condition. Backlight detection means for detecting, and when the backlight detection means detects a backlit state, the aperture means is controlled to be opened further to correct the brightness level of the central portion. Correction means for controlling the signal in the high-luminance portion to be more strongly suppressed by switching the non-linear conversion characteristic in the non-linear conversion means. Imaging device, characterized in that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59097584A JP2504939B2 (en) | 1984-05-17 | 1984-05-17 | Imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59097584A JP2504939B2 (en) | 1984-05-17 | 1984-05-17 | Imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60242776A JPS60242776A (en) | 1985-12-02 |
| JP2504939B2 true JP2504939B2 (en) | 1996-06-05 |
Family
ID=14196284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59097584A Expired - Fee Related JP2504939B2 (en) | 1984-05-17 | 1984-05-17 | Imaging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2504939B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101894542B1 (en) | 2017-09-12 | 2018-10-04 | 한국남동발전 주식회사 | Method for controlling HP-bypass pressure control valve of drum type fluidized boiler of thermal power plant shut down |
| EP3992528A1 (en) | 2020-11-02 | 2022-05-04 | Alfa Laval Corporate AB | A method of controlling a supply of feed water into a boiler |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS627290A (en) * | 1985-07-04 | 1987-01-14 | Fuji Photo Film Co Ltd | Gradient correction for color negative film picking up image and its device |
| JP2667721B2 (en) * | 1989-11-27 | 1997-10-27 | アイワ株式会社 | Video camera |
| JP5094607B2 (en) | 2008-07-16 | 2012-12-12 | キヤノン株式会社 | Imaging apparatus, control method thereof, and program |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59101557U (en) * | 1982-12-27 | 1984-07-09 | 三菱電機株式会社 | Video camera |
| JPS60214168A (en) * | 1984-04-10 | 1985-10-26 | Fuji Photo Film Co Ltd | Back light correction circuit in video camera |
-
1984
- 1984-05-17 JP JP59097584A patent/JP2504939B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101894542B1 (en) | 2017-09-12 | 2018-10-04 | 한국남동발전 주식회사 | Method for controlling HP-bypass pressure control valve of drum type fluidized boiler of thermal power plant shut down |
| EP3992528A1 (en) | 2020-11-02 | 2022-05-04 | Alfa Laval Corporate AB | A method of controlling a supply of feed water into a boiler |
| WO2022090480A1 (en) | 2020-11-02 | 2022-05-05 | Alfa Laval Corporate Ab | A method of controlling a supply of feed water into a boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60242776A (en) | 1985-12-02 |
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| LAPS | Cancellation because of no payment of annual fees |