JPH0548977A - Telecamera - Google Patents

Telecamera

Info

Publication number
JPH0548977A
JPH0548977A JP3228839A JP22883991A JPH0548977A JP H0548977 A JPH0548977 A JP H0548977A JP 3228839 A JP3228839 A JP 3228839A JP 22883991 A JP22883991 A JP 22883991A JP H0548977 A JPH0548977 A JP H0548977A
Authority
JP
Japan
Prior art keywords
image
field
field frequency
ccd
charge storage
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.)
Granted
Application number
JP3228839A
Other languages
Japanese (ja)
Other versions
JP2715731B2 (en
Inventor
Setsuo Yamamoto
節雄 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP3228839A priority Critical patent/JP2715731B2/en
Publication of JPH0548977A publication Critical patent/JPH0548977A/en
Application granted granted Critical
Publication of JP2715731B2 publication Critical patent/JP2715731B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Transforming Light Signals Into Electric Signals (AREA)

Abstract

PURPOSE:To prevent the occurrence of uneven brightness even at the time of image pickup with an image monitor having a difference field frequency by controlling the charge storage time of an imaging device light receiving part based on an external timing signal. CONSTITUTION:An electric signal from a CCD 2 is processed and outputted as a video signal by a processing circuit 3 and a processing amplifier 4. On the other hand, a driving timing signal is inputted from an image monitor device to perform the image pickup to a terminal 10, and the field frequency of the monitor device is detected by a synchronization separation circuit 9. A shutter speed control circuit 7 generates a shutter speed control signal corresponding to the difference between a detection frequency and an internally set field frequency and supplies it to a CCD driving circuit 6. The driving circuit 6 controls the charge storage time at the light receiving part of the CCD 2 for each field and determines electronic shutter speed. Thus, the brightness of a video image can be made even when a television image having the different field is photographed.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、所定のフィールド周波
数に基づいて映像が出力されているテレビジョン画面を
撮像する場合に好適のテレビジョンカメラ装置に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television camera device suitable for picking up a television screen on which an image is output based on a predetermined field frequency.

【0002】[0002]

【従来の技術】従来のテレビジョンカメラ装置は、光を
電気信号に変換する固体撮像素子(CCD素子)を備え
ており、予め設定されたフィールド周波数に基づいてこ
の固体撮像素子の受光部に蓄積された電荷を垂直転送レ
ジスタに転送し、その後水平レジスタを介して映像出力
として出力する。
2. Description of the Related Art A conventional television camera device is provided with a solid-state image sensor (CCD element) for converting light into an electric signal, and is stored in a light-receiving portion of the solid-state image sensor based on a preset field frequency. The generated charge is transferred to the vertical transfer register, and then output as a video output via the horizontal register.

【0003】ところで、固体撮像素子の受光部に蓄積さ
れた電荷を任意のタイミングで掃き出させることによ
り、受光部における電荷蓄積時間を任意に設定すること
ができるテレビジョンカメラ装置も提案されている(特
開昭62-120784 号)。このテレビジョンカメラ装置にお
いては、電荷蓄積時間を制御することにより所謂電子シ
ャッター動作を実現し、動きが速い被写体を撮影する場
合に解像度が劣化することを回避することができる。
By the way, there has also been proposed a television camera device capable of arbitrarily setting the charge storage time in the light receiving portion by sweeping out the charges accumulated in the light receiving portion of the solid-state image pickup device at an arbitrary timing. (JP-A-62-120784). In this television camera device, so-called electronic shutter operation is realized by controlling the charge accumulation time, and it is possible to avoid deterioration of resolution when photographing a fast-moving subject.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、従来の
テレビジョンカメラ装置においては、その内部に設定さ
れたフィールド周波数と異なるフィールド周波数に基づ
いて映像出力しているテレビジョン装置(以下、画像モ
ニタ装置という)の画面を撮影すると、撮影した映像に
明るさのむらが発生するという問題点がある。例えば、
従来、1フィールドが60HzのEIA方式のテレビジ
ョンカメラ装置で、コンピュータ装置のモニタ画面等の
ようにEIA方式以外の方式の画像モニタ装置の画面を
撮影した場合は、その画像モニタ装置の垂直走査周波数
とテレビジョンカメラ装置の垂直走査周波数との差に相
当する分だけ、撮影した映像に明るさのむらが発生す
る。
However, in the conventional television camera device, a television device (hereinafter, referred to as an image monitor device) which outputs an image based on a field frequency different from the field frequency set therein. When the screen of () is photographed, there is a problem that unevenness in brightness occurs in the captured image. For example,
Conventionally, when a screen of an image monitor device of a system other than the EIA system such as a monitor screen of a computer device is photographed by a television camera device of the EIA system in which one field is 60 Hz, the vertical scanning frequency of the image monitor device. The brightness unevenness occurs in the captured image by the amount corresponding to the difference between the vertical scanning frequency of the television camera device.

【0005】なお、特開昭62-120784 号に開示されたテ
レビジョンカメラ装置は、被写体に応じて電子シャッタ
ー動作を制御するものであり、テレビジョンカメラ装置
のフィールド周波数と画像モニタ装置のフィールド周波
数との差を補正するものではない。従って、この特開昭
62-120784 号に開示されたテレビジョンカメラ装置にお
いても、フィールド周波数が異なる画像モニタ装置の画
面を撮影すると、明るさのむらが発生する。
The television camera device disclosed in Japanese Unexamined Patent Publication (Kokai) No. 62-120784 controls the electronic shutter operation according to the subject. The field frequency of the television camera device and the field frequency of the image monitor device are It does not correct the difference between and. Therefore, this
Even in the television camera device disclosed in No. 62-120784, when the screen of the image monitor device having different field frequencies is photographed, uneven brightness occurs.

【0006】本発明はかかる問題点に鑑みてなされたも
のであって、テレビジョンカメラ装置に設定されたフィ
ールド周波数と異なるフィールド周波数に基づいて映像
が表示されている画像モニタ装置の画面を撮影しても、
撮影した画面に明るさのむらが発生することを回避でき
るテレビジョンカメラ装置を提供することを目的とす
る。
The present invention has been made in view of the above problems, and captures a screen of an image monitor device on which an image is displayed based on a field frequency different from the field frequency set in the television camera device. Even
An object of the present invention is to provide a television camera device capable of avoiding unevenness in brightness on a captured screen.

【0007】[0007]

【課題を解決するための手段】本発明に係るテレビジョ
ンカメラ装置は、受光部における電荷蓄積時間の制御が
可能な固体撮像素子と、外部から与えられるタイミング
信号と内部設定されたフィールド周波数とを比較しその
差に応じて1フィールド毎に前記固体撮像素子の受光部
における電荷蓄積時間を制御する駆動制御手段とを有す
ることを特徴とする。
A television camera device according to the present invention comprises a solid-state image sensor capable of controlling a charge storage time in a light receiving section, a timing signal applied from the outside, and a field frequency set internally. And a drive control means for controlling the charge storage time in the light receiving portion of the solid-state image pickup device for each field according to the difference.

【0008】[0008]

【作用】本発明においては、外部から与えられるタイミ
ング信号と内部設定されたフィールド周波数とを比較
し、その差に応じて固体撮像素子の受光部における電荷
蓄積時間を制御する駆動制御手段が設けられている。即
ち、本発明に係るテレビジョンカメラ装置においては、
テレビジョンカメラ装置のフィールド周波数と異なるフ
ィールド周波数に基づいて映像が出力されている画像モ
ニタ装置の画面を撮影する場合、この駆動制御手段が内
部に設定されたフィールド周波数と画像モニタ装置のフ
ィールド周波数とのずれを補正するように固体撮像素子
を駆動制御して、受光部における電荷蓄積時間を制御す
る。これにより、撮影した映像に明るさのむらが発生す
ることを回避することができる。
In the present invention, the drive control means is provided for comparing the timing signal given from the outside with the field frequency set internally, and controlling the charge accumulation time in the light receiving portion of the solid-state image pickup device according to the difference. ing. That is, in the television camera device according to the present invention,
When shooting a screen of an image monitor device in which an image is output based on a field frequency different from the field frequency of the television camera device, this drive control means sets the field frequency set internally and the field frequency of the image monitor device. The solid-state image sensor is drive-controlled so as to correct the deviation of the charge, and the charge accumulation time in the light receiving portion is controlled. As a result, it is possible to avoid the occurrence of uneven brightness in the captured image.

【0009】[0009]

【実施例】次に、本発明の実施例について添付の図面を
参照して説明する。
Embodiments of the present invention will now be described with reference to the accompanying drawings.

【0010】図1は本発明の実施例に係るテレビジョン
カメラ装置を示すブロック図である。
FIG. 1 is a block diagram showing a television camera device according to an embodiment of the present invention.

【0011】固体撮像素子(CCD素子)2はレンズ1
によって結像された画像を電気信号に変換する。この信
号は、信号処理回路3及びプロセスアンプ4により所定
の処理が施された後、出力端子5から映像信号として出
力される。
The solid-state image sensor (CCD element) 2 is a lens 1.
The image formed by is converted into an electric signal. This signal is subjected to predetermined processing by the signal processing circuit 3 and the process amplifier 4, and then output from the output terminal 5 as a video signal.

【0012】一方、入力端子10には撮影すべき外部被
写体の画像モニタ装置から駆動タイミング信号が与えら
れる。同期分離回路9は、この駆動タイミング信号に基
づいて画像モニタ装置のフィールド周波数を検出する。
シャッター速度制御回路7は、同期分離回路9の出力と
内部設定されたフィールド周波数との差に応じて、フィ
ールド毎のシャッター速度を制御すべく、CCD駆動回
路6に信号を出力する。CCD駆動回路6は、この信号
に基づいてフィールド毎に固体撮像素子2の受光部にお
ける電荷蓄積時間を制御し、電子シャッター速度を決定
する。なお、被写体である画像モニタ装置の垂直ブラン
キング幅に応じて、調整器8を調整する。
On the other hand, a drive timing signal is given to the input terminal 10 from an image monitor device of an external subject to be photographed. The sync separation circuit 9 detects the field frequency of the image monitor device based on the drive timing signal.
The shutter speed control circuit 7 outputs a signal to the CCD drive circuit 6 in order to control the shutter speed for each field according to the difference between the output of the sync separation circuit 9 and the field frequency set internally. The CCD drive circuit 6 controls the charge storage time in the light receiving portion of the solid-state image sensor 2 for each field based on this signal, and determines the electronic shutter speed. The adjuster 8 is adjusted according to the vertical blanking width of the image monitor device which is the subject.

【0013】図2は、本実施例装置の動作を示すタイミ
ングチャート図である。
FIG. 2 is a timing chart showing the operation of the apparatus of this embodiment.

【0014】符号21a〜21fは外部モニタ装置の垂
直走査期間、符号22a〜22fはその垂直ブランキン
グ期間であり、符号23a〜23dは本実施例装置のフ
ィールド期間である。
Reference numerals 21a to 21f are vertical scanning periods of the external monitor apparatus, reference numerals 22a to 22f are vertical blanking periods thereof, and reference numerals 23a to 23d are field periods of the apparatus of this embodiment.

【0015】外部信号に基づく固体撮像素子2の電荷蓄
積時間の制御が行なわれない(即ち、入力端子10にタ
イミング信号が与えられない)とすると、フィールド期
間に蓄積された電荷がフィールド期間終了と同時に垂直
転送レジスタに転送され、その後水平レジスタを経て映
像出力となる。例えば、図2に示すように、期間23a
及び23dでは外部モニタの映像内に1つの垂直ブラン
キング期間が含まれるが、期間23b及び23cには2
つの垂直ブランキング期間が含まれる。その結果、期間
23a,23dと期間23b,23cとでは、カメラ装
置に撮影されるモニタ画面の走査線数が異なってしま
う。
If the charge storage time of the solid-state image pickup device 2 is not controlled based on an external signal (that is, the timing signal is not applied to the input terminal 10), the charge stored in the field period ends. At the same time, it is transferred to the vertical transfer register, and then the video is output via the horizontal register. For example, as shown in FIG. 2, the period 23a
And 23d, one vertical blanking period is included in the image on the external monitor, but two vertical blanking periods are included in the periods 23b and 23c.
One vertical blanking period is included. As a result, the number of scanning lines on the monitor screen captured by the camera device differs between the periods 23a and 23d and the periods 23b and 23c.

【0016】つまり、この例では、外部の画像モニタ装
置のフィールド周波数が本実施例のカメラ装置のフィー
ルド周波数よりも高いため、1つのフィールドの一部分
において画像モニタ装置の走査線が2回分露光されるこ
とになる。そして、この幅がカメラ装置のフィールド毎
に異なってしまう。このため、走査線が2回分露光され
た部分は画面が明るくなり、この明るくなる領域は両者
のフィールド周波数の差によって変化する。これによ
り、カメラ装置の映像出力には帯状の明るい部分が流れ
ることになる。
That is, in this example, since the field frequency of the external image monitor device is higher than the field frequency of the camera device of this embodiment, the scanning line of the image monitor device is exposed twice in a part of one field. It will be. Then, this width is different for each field of the camera device. For this reason, the screen becomes bright in the part where the scanning line is exposed twice, and the bright region changes depending on the difference between the field frequencies of the two. As a result, a band-shaped bright portion flows in the video output of the camera device.

【0017】ここで、入力端子10に画像モニタ装置か
らタイミング信号を与え、このタイミング信号に基づい
て電子シャッターを動作させる。これにより、CCD駆
動回路6は固体撮像素子2における露光時間を符号24
a〜24dで示すように、画像モニタ装置の走査期間2
1a〜21fと同一に設定する。即ち、CCD駆動回路
6は、フィールド毎に不要電荷掃き出し期間26a〜2
6dを設定する。この場合に、期間24aには画像モニ
タ装置のブランキング期間は含まれないが、期間24b
〜24dにはブランキング期間が1回づつ含まれるの
で、このままでは期間24b〜24dでは画像モニタ装
置の1画面分の走査線を撮像しないことになる。そこ
で、本実施例においては、CCD駆動回路6が期間24
b〜24dのフィールドの露光時間を夫々画像モニタ装
置の垂直ブランキング期間に応じた幅25b〜25dだ
け拡大する。これにより、各フィールドにおいて、全て
画像モニタ装置の1フィールド分(走査1回分)だけを
撮像したことになる。
Here, a timing signal is applied from the image monitor device to the input terminal 10, and the electronic shutter is operated based on this timing signal. As a result, the CCD drive circuit 6 sets the exposure time of the solid-state image sensor 2 to the reference numeral 24.
a to 24d, the scanning period 2 of the image monitor device
Set the same as 1a to 21f. That is, the CCD drive circuit 6 has the unnecessary charge sweeping periods 26a to 2 for each field.
Set 6d. In this case, the period 24a does not include the blanking period of the image monitor device, but the period 24b
Since the blanking period is included in each of 24d to 24d once, the scanning line for one screen of the image monitor device is not imaged in the periods 24b to 24d. Therefore, in the present embodiment, the CCD drive circuit 6 operates in the period 24
The exposure times of the fields b to 24d are expanded by widths 25b to 25d corresponding to the vertical blanking period of the image monitor device, respectively. As a result, in each field, only one field (one scan) of the image monitor device is imaged.

【0018】本実施例装置においては、このようにCC
D駆動回路6が入力端子10に与えられるタイミング信
号に基づいて固体撮像素子2の受光部における電荷蓄積
時間を制御するため、フィールドが異なるテレビジョン
画面を撮影しても、撮影した映像の明るさは均一にな
り、目障りな帯状ノイズが発生しない。
In the apparatus of this embodiment, the CC
Since the D drive circuit 6 controls the charge storage time in the light receiving portion of the solid-state image pickup device 2 based on the timing signal given to the input terminal 10, even if a television screen in a different field is shot, the brightness of the shot image is Is uniform, and no disturbing band noise is generated.

【0019】[0019]

【発明の効果】以上説明したように本発明においては、
外部から与えられるタイミング信号に基づいて固体撮像
素子の受光部における電荷蓄積時間を制御する駆動制御
手段が設けられているから、テレビジョンカメラ装置の
フィールド周波数と異なるフィールド周波数の画像モニ
タ装置の画面を撮影しても、撮影した映像に明るさのむ
らが発生しないという効果を奏する。
As described above, according to the present invention,
Since the drive control means for controlling the charge storage time in the light receiving portion of the solid-state image sensor based on the timing signal given from the outside is provided, the screen of the image monitor device of the field frequency different from the field frequency of the television camera device is displayed. Even if a picture is taken, there is an effect that unevenness in brightness does not occur in the taken picture.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例に係るテレビジョンカメラ装置
を示すブロック図である。
FIG. 1 is a block diagram showing a television camera device according to an embodiment of the present invention.

【図2】同じくその動作を示すタイミングチャート図で
ある。
FIG. 2 is a timing chart diagram showing the same operation.

【符号の説明】[Explanation of symbols]

1;レンズ 2;固体撮像素子 3;信号処理回路 4;プロセスアンプ 5;映像出力端子 6;CCD駆動回路 7;シャッター速度制御回路 8;調整器 9;同期分離回路 10;入力端子 1; Lens 2; Solid-state imaging device 3; Signal processing circuit 4; Process amplifier 5; Video output terminal 6; CCD drive circuit 7; Shutter speed control circuit 8; Adjuster 9; Sync separation circuit 10; Input terminal

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 受光部における電荷蓄積時間の制御が可
能な固体撮像素子と、外部から与えられるタイミング信
号と内部設定されたフィールド周波数とを比較しその差
に応じて1フィールド毎に前記固体撮像素子の受光部に
おける電荷蓄積時間を制御する駆動制御手段とを有する
ことを特徴とするテレビジョンカメラ装置。
1. A solid-state image sensor capable of controlling a charge storage time in a light-receiving section, and a timing signal given from the outside and an internally set field frequency are compared, and the solid-state image pickup is performed for each field according to the difference. A television camera device comprising: a drive control unit that controls a charge storage time in a light receiving portion of the element.
JP3228839A 1991-08-14 1991-08-14 Television camera equipment Expired - Fee Related JP2715731B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3228839A JP2715731B2 (en) 1991-08-14 1991-08-14 Television camera equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3228839A JP2715731B2 (en) 1991-08-14 1991-08-14 Television camera equipment

Publications (2)

Publication Number Publication Date
JPH0548977A true JPH0548977A (en) 1993-02-26
JP2715731B2 JP2715731B2 (en) 1998-02-18

Family

ID=16882671

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3228839A Expired - Fee Related JP2715731B2 (en) 1991-08-14 1991-08-14 Television camera equipment

Country Status (1)

Country Link
JP (1) JP2715731B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08195912A (en) * 1995-01-13 1996-07-30 Nec Corp Solid-state image pickup device
JP2002305671A (en) * 2001-04-03 2002-10-18 Yamagata Univ Research Institute Method for decreasing streak in display screen and image display device therefor
JP2012114825A (en) * 2010-11-26 2012-06-14 Samsung Electronics Co Ltd Imaging device, imaging system and imaging method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08195912A (en) * 1995-01-13 1996-07-30 Nec Corp Solid-state image pickup device
JP2002305671A (en) * 2001-04-03 2002-10-18 Yamagata Univ Research Institute Method for decreasing streak in display screen and image display device therefor
JP4596299B2 (en) * 2001-04-03 2010-12-08 敏夫 古閑 Method for reducing streak in display screen and image display apparatus thereof
JP2012114825A (en) * 2010-11-26 2012-06-14 Samsung Electronics Co Ltd Imaging device, imaging system and imaging method

Also Published As

Publication number Publication date
JP2715731B2 (en) 1998-02-18

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