JPH01241277A - Image pickup device - Google Patents
Image pickup deviceInfo
- Publication number
- JPH01241277A JPH01241277A JP63067178A JP6717888A JPH01241277A JP H01241277 A JPH01241277 A JP H01241277A JP 63067178 A JP63067178 A JP 63067178A JP 6717888 A JP6717888 A JP 6717888A JP H01241277 A JPH01241277 A JP H01241277A
- Authority
- JP
- Japan
- Prior art keywords
- output
- exposure
- gate
- terminal
- analog switch
- 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
Links
- 238000003384 imaging method Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 abstract description 6
- 238000005375 photometry Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 102100036049 T-complex protein 1 subunit gamma Human genes 0.000 description 1
- 101150062912 cct3 gene Proteins 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、撮像素子により本露光前に前露光を行って
露出条件を決定する撮像装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an imaging apparatus that determines exposure conditions by performing pre-exposure using an imaging element before main exposure.
［従来の技術］
従来からＣＣＤ等の撮像素子を用いて磁、気ディスク等
の記録媒体に１フイール１〜あるいはｌフレーム毎の静
１Ｆ画像信号を記録する１１を子スチルカメラは知られ
ている。[Prior Art] Sub-still cameras have been known for recording static 1F image signals for every 1 file or 1 frame on a recording medium such as a magnetic or magnetic disk using an imaging device such as a CCD. .
ところて、ト述の様な撮像素子を用いた電子スチルカメ
ラては、露出情報を得るための測光素子と、被写体像を
撮像するための撮像素子との間の感度特性の相違、ある
いは撮像素子自体のダイナミック特性の狭さ等の原因に
より撮像素子に対して適切な露光にを与えることか困難
であった。そのため、この点を解決する方法として、例
えば特開昭５９−１０４８６７号あるいは特開昭６０−
３２４８４時等に述べられている如く、測光素子にて得
られた露光条件にて一度撮像素子で撮影し、該撮像素子
からの画像信号に基づいて１本露光用の条件を算出する
方法か提案されている。However, in electronic still cameras that use image sensors such as those mentioned above, there are differences in sensitivity characteristics between the photometric element for obtaining exposure information and the image sensor for capturing the subject image, or differences in the sensitivity characteristics of the image sensor. It has been difficult to provide appropriate exposure to the image sensor due to factors such as its narrow dynamic characteristics. Therefore, as a method to solve this problem, for example, JP-A-59-104867 or JP-A-60-
32,484, etc., a method is proposed in which a photograph is taken once with an image sensor under the exposure conditions obtained by a photometric element, and conditions for one exposure are calculated based on the image signal from the image sensor. has been done.
［発明か解決しようとする課題］
１−記のような従来の撮像素子からの画像情報は、はぼ
画面の中央部付近からサンプリンクして評価する中央重
点測光方式であったから、中央部以外の領域にある所望
の被写体を適正露光をしたい［１中シンクロ等の撮；ン
をすることかできないという問題かあった。[Invention or problem to be solved] Image information from a conventional image sensor as described in 1- above was based on a center-weighted photometry method in which the image information was sampled from near the center of the screen and evaluated. If you want to properly expose a desired subject in the area of
この発明はかかる従来の問題点を解決するためになされ
たものて、中央部以外の被写体に対しても、適正な露光
！、シの得られる撮像装置を得ることをＩＩ的とする。This invention was made to solve these conventional problems, and allows for proper exposure even for subjects other than the central part! The second objective is to obtain an imaging device that can obtain the following.
［課題を解決するためのＬ段］
［−記の目的を達成するためにこの発明は、撮像素ｆか
ら前露光により１１）られた画像信号の範囲を画像の中
央部付近と、この中央部付近以外に切換えることかてき
る一ｆ段を設けたものである。[L stage for solving the problem] [In order to achieve the object stated in -, the present invention provides a method to reduce the range of the image signal obtained by pre-exposure from the image sensor f to the vicinity of the center of the image and the range of the image signal to the center of the image. It is equipped with one f stage that can be switched to other than the vicinity.
［作用］
［、記の構成によれば、中央の被り１体に対しては、閃
光発光￥制御により適ＩＥな露光７″をｌｊ〜えること
かてさ、また、ｌ”］中シンクロ等画面中央部にない周
辺部の被写体にも適正な露光Ｆ５をｒｐえたい場合、中
央部以外に測光範囲を変化させることにより、周辺部の
被写体に対し、適正な露光ｒｌＸ：をｌえることかてき
、均一て良好な画像か得られる。[Function] [According to the configuration described above, it is possible to obtain an appropriate IE exposure of 7" for one overlapping object in the center by flash light emission control, and also for the middle sync, etc. If you want to obtain an appropriate exposure F5 for subjects in the periphery that are not in the center of the screen, you can set the appropriate exposure rlX: for subjects in the periphery by changing the metering range to areas other than the center. , uniform and good images can be obtained.
［実施例］ 第１図は本発明の実施例を示す回路図である。[Example] FIG. 1 is a circuit diagram showing an embodiment of the present invention.
［４中１０１は撮影光学系、１０２は絞りである。[101 in 4 is a photographing optical system, and 102 is an aperture.
１０３はｃｃｔｇ：の撮像７ド子てその出力は信号処理
回路１０４に人力されている。信号−処理回路１０４の
出力は記録装置に導かれると共に、アリ−ログスイッチ
１０５と抵抗１０６の直列回路を介して、他端かグラン
ドに接続されたキャパシタ１０７の一端に接続される。Reference numeral 103 denotes a CCTG: seven-stage imaging sensor, the output of which is input manually to a signal processing circuit 104. The output of the signal processing circuit 104 is led to the recording device, and is connected via a series circuit of an alley log switch 105 and a resistor 106 to one end of a capacitor 107, the other end of which is connected to ground.
また、出力と反転入力か直結され、電圧）オロア構成と
なった演算増幅Ｘ Ｉ Ｏ８の非反転入力端子に前記キ
ャパシタ１０７の一端か接続される。演算増幅器１０８
の出力は、演算増幅器１１７、ノ、（準電圧発生回路１
１８、抵抗１１５，１．１６よりなる反転増幅器１６０
に入力され、反転増’！’ｒＪ２１４１６０の出力には
絞り駆動コイル１１９か接続される。絞り駆動コイル１
１９はその端子１１９ａか；口ｔｔ圧て駆動された場合
絞りを開き、負’ｉ（ｊ圧で駆動された場合絞りを閉じ
る。１２０はモート切換用のアナログスイッチて、アナ
ログスイッチ１２０の端子１２０ａは正電源側に、端子
１２０ｂはグランドレベルに、端子１２０ｃはオア回路
１２７に接続される。Further, the output and the inverting input are directly connected, and one end of the capacitor 107 is connected to the non-inverting input terminal of the operational amplifier XIO8 having a voltage-oror configuration. Operational amplifier 108
The output of the operational amplifier 117, (quasi-voltage generation circuit 1
18, inverting amplifier 160 consisting of resistors 115, 1.16
Input and inversion increase'! The aperture drive coil 119 is connected to the output of 'rJ214160. Aperture drive coil 1
19 is the terminal 119a of the terminal 119a of the analog switch 120, which opens the diaphragm when driven with a negative pressure, and closes the diaphragm when driven with a negative i (j pressure). is connected to the positive power supply side, the terminal 120b is connected to the ground level, and the terminal 120c is connected to the OR circuit 127.
１２３はクロック回路てあり、その端子１２３ａからは
木乎同期信号ＨＤか出力され、それがモノステーブルマ
ルチバイブレータ１２４を通してアンドゲート１２６の
２人力のうちの一方に入力されると共に、反転回路１３
１を通ってオアゲート１３３の２人力のうち一方に入力
される。クロワク回路１２３の端子１２３ｂからは垂直
同期信号Ｖ。が出力され、それがモノステーブルマルチ
バイブレータ１２５を通して、アンドゲート１２６のも
う一方の入力に接続されると共に、反転回路１３２を通
ってオアゲート１３３のもう一方の入力に接続される。Reference numeral 123 denotes a clock circuit, from which a terminal 123a outputs a Mokko synchronization signal HD, which is input to one of the two inputs of an AND gate 126 through a monostable multivibrator 124, and is also input to an inverting circuit 13.
1 and is input to one of the two manpower of the OR gate 133. A vertical synchronizing signal V is output from a terminal 123b of the clock circuit 123. is output, which is connected to the other input of the AND gate 126 through the monostable multivibrator 125, and is connected to the other input of the OR gate 133 through the inverting circuit 132.
アンドゲート１２６゜オアゲート１３３の出力は、アナ
ログスイッチ１５０の端子１５０ｂ、１５０ｃにそれぞ
れ接続される。また、１０３〜１０８及び１１７等によ
り測光−Ｌ段が構成され、１２３〜１２７ｋｇにより測
光分布制御手段が構成されている。The outputs of the AND gate 126° OR gate 133 are connected to terminals 150b and 150c of the analog switch 150, respectively. Moreover, the photometric L stage is comprised by 103-108, 117, etc., and the photometric distribution control means is comprised by 123-127 kg.
また、ＦＬは閃光発光装置であり、アナログスイッチ１
２０が１２０ａ’側の時、Ｆｌｌレシンクロモードなり
、１２０ｂ側の時、通常の閃光撮影モートになる
本発明の一実施例はＬ述の如き構成よりなるものてあり
、以下に第２図、第３図も参照しながらその作用につい
て説明する。Also, FL is a flash light emitting device, and analog switch 1
When 20 is on the 120a' side, it is in the full resync mode, and when it is on the 120b side, it is in the normal flash photography mode.One embodiment of the present invention has the configuration as described in L, and is shown below in Figure 2. The operation will be explained with reference to FIG. 3 as well.
まず、通常の閃光撮影モードまたは閃光装置を使わない
干−ドにおける中央重点測光の場合から説明する。First, center-weighted photometry in normal flash photography mode or in dry mode without using a flash device will be explained.
この場合アナログスイ・ンチ１２０の端子１２０Ｃは、
１２０ｂ側に切換えられ、アナログスイッチ１５０の端
子１５０ａは１５０ｂ側に切換られるため、オアゲート
１２７はその一方の入力かローレベルとなるから、この
出力はもう一方の入力であるアントゲート１２６の出力
によって決まる。In this case, the terminal 120C of the analog switch 120 is
Since the terminal 150a of the analog switch 150 is switched to the 120b side, one input of the OR gate 127 becomes low level, so this output is determined by the output of the other input, the ant gate 126. .
ここて、第２図、第３図のタイミングチャー１−も参照
しながら考えると、クロック回路１２３の出力１２３ａ
は第２図（ａ）の如き波形をしており、モノステーフル
マルチバイブレータ１２４はこれをもとに第２図（ｂ）
の如く、水を走査線の−・部でハイレベルとなるパルス
を発生する。−方クロック回路１２３の出力１２３ｂは
第３図（ａ）の如き波形をしており、モノステーブルマ
ルチバイブレータ１２５はこれをもとに：５３図（ｂ）
の如く、重置走査期間の一部でハイレベルになるパルス
を発生する。アンドゲート１２６は、これら２つのモノ
ステーブルマルチバイブレータ１２４．１２５の出力の
アンドであるから、水平、＠直筒部のともに一部、即ち
全画面中第４図の斜線で示した部分Ａでハイレベルにな
るからアナログスイッチ１０５の制御端子１０５ｃも全
画面中の同し箇所てハイレベルになる。このため、この
部分に相当する輝度信号のみか抵抗１０６、キャパシタ
１０７よりなるローパスフィルタ以後に伝達される。Here, if we also refer to the timing chart 1- in FIGS. 2 and 3, the output 123a of the clock circuit 123
has a waveform as shown in Fig. 2(a), and the monostabilized multivibrator 124 has a waveform as shown in Fig. 2(b) based on this.
As shown in FIG. The output 123b of the - direction clock circuit 123 has a waveform as shown in Fig. 3(a), and the monostable multivibrator 125 is based on this as shown in Fig. 53(b).
A pulse that becomes high level during a part of the overlapping scan period is generated as shown in FIG. Since the AND gate 126 is an AND of the outputs of these two monostable multivibrators 124 and 125, the level is high in both the horizontal and straight cylinder parts, that is, the hatched part A in FIG. 4 of the entire screen. Therefore, the control terminal 105c of the analog switch 105 also becomes high level at the same location on the entire screen. Therefore, only the luminance signal corresponding to this portion is transmitted after the low-pass filter consisting of the resistor 106 and the capacitor 107.
次に、このスイッチ関係以外の動作について説明する。Next, operations other than those related to this switch will be explained.
絞り１０２を通して光学系ｌｏｔにより撮像素子１０３
上に被写体の像を結ばせ、その光電変換出力を信号処理
回路１０４に通すことにより輝度成分を抽出する。さら
にそれをアナログスイッチ１０５を通して、抵抗１０６
．キャパシタ１０７よりなるローパスフィルタに人力す
る。これにより、第４ ［％ Ａの領域の輝度信号のｆ
均値か電圧フォロア構成の演算増幅器１０Ｂに人力され
、回しく（ｉの１ｕ圧か演算増幅器１０Ｂの出力に出力
される。そして、このが（算増幅器１０８の出力は、反
転増幅器１６０に入力する。中央部Ａに入力する輝度の
モ均値か望みの値より高い場合、反転増幅器１６０の出
力は負になり、絞り駆動コイル１１９の端子１１９ａを
負電圧駆動して、絞り１０２を閉じさせて撮像素子１０
３への入射光強度を低下させる。The image sensor 103 is passed through the aperture 102 by the optical system lot.
An image of the subject is focused on the image, and the photoelectric conversion output is passed through the signal processing circuit 104 to extract the luminance component. Furthermore, it is passed through an analog switch 105 and a resistor 106
．． A low pass filter consisting of a capacitor 107 is manually applied. As a result, f of the luminance signal in the area of 4th [%A]
The average value is input to the operational amplifier 10B with a voltage follower configuration, and the 1u voltage of (i) is output to the output of the operational amplifier 10B. If the average value of the luminance input to the central portion A is higher than the desired value, the output of the inverting amplifier 160 becomes negative, and the terminal 119a of the aperture drive coil 119 is driven with a negative voltage to close the aperture 102. Image sensor 10
Reduce the intensity of the incident light to 3.
逆に部分Ａに入力する輝度のモ均値が望みの値よりも低
い場合１反転増幅器１６０の出力はＩＦになり、絞り駆
動コイル１１９の端子１１９ａを正電圧駆動して絞り１
０２を開いて撮像素７−１Ｏ３への入射光強度をより高
くさせる。このようにして、最終的には部分Ａにおける
入射光量か常に一定となるような制御がなされる。Conversely, if the average value of the luminance input to part A is lower than the desired value, the output of the 1-inverting amplifier 160 becomes IF, and the terminal 119a of the aperture drive coil 119 is driven with a positive voltage to drive the aperture 1.
02 to increase the intensity of light incident on the image sensor 7-1O3. In this way, control is performed so that the amount of incident light at portion A is always constant.
尚、ここの例ては斜線部以外、即ち部分Ｂは重みづけな
してないか、例えばアナログスイッチ１０５と並列に抵
抗を挿入する事により斜ｍ部以外の輝度信号を反映させ
る・バができる。Incidentally, in this example, the areas other than the shaded area, that is, the area B, are not weighted or, for example, by inserting a resistor in parallel with the analog switch 105, it is possible to reflect the luminance signal other than the area M.
次に、日中シンクロモードにおいて、中央部以外の測光
に切換えた場合について説明する。Next, a case will be described in which the daytime sync mode is switched to photometry for areas other than the central area.
この場合、モート切換用のアナログスイッチ１５０の端
子１５０ａは１５０ｃ側に切換えられるため、オアゲー
ト１２７の出力はオアゲート１３３の出力によって決ま
るようになる。In this case, since the terminal 150a of the analog switch 150 for mote switching is switched to the 150c side, the output of the OR gate 127 is determined by the output of the OR gate 133.
またモノステーブルマルチバイブレータ１２４１２５の
出力は反転回路１３１，１３２を通すから、その出力は
第２図（ｂ）、第３図（ｂ）におけるハイレベルとロー
レベルか入換った波形とな、す、その波形がオアゲート
１３３に入るため。Furthermore, since the output of the monostable multivibrator 124125 passes through the inverting circuits 131 and 132, the output has a waveform in which the high level and low level in FIGS. 2(b) and 3(b) are switched. , because the waveform enters the OR gate 133.
その出力は部分Ａ以外の範囲の部分Ｂのみハイレベルに
なり、アナログスイッチ１０５の制御端子１０５ｃも全
画面中の同じ箇所てハイレベルになり、部分Ｂの輝度信
号が抵抗１０６．キャパシタ１０７よりなるローパスフ
ィルタ以後に伝達され、最終的に部分Ｂにおける入射光
量が常に一定となるような制御か部分Ａにおける場合と
回しようになされる。The output becomes high level only in part B in the range other than part A, and the control terminal 105c of analog switch 105 also becomes high level in the same part of the entire screen, and the luminance signal of part B becomes high level at the same part of the entire screen. The light is transmitted to a low-pass filter formed by a capacitor 107, and the control is performed such that the amount of light incident on portion B is always constant in the same manner as in portion A.
［発明の効果］
以に説明したように、この発明は撮像素子により本露光
に先たつ前露光を行い、Ｊｆ価測光し、撮影する撮像装
置において、中央部の主被写体には閃光発光量制御によ
って、適正な露光ｔし寺え、さらに、］１中シンクロ等
のモードに切換えた時、測光範囲を中央部から中央部以
外に移すことによって中央部にない従被写体に対しても
、適正な露光ｆｌｆをγえ、主被写体、従被写体とも均
一な良好の画像がイ１）られる。[Effects of the Invention] As explained above, the present invention provides an imaging device that performs pre-exposure prior to main exposure using an image sensor, performs Jf value photometry, and photographs the image, in which flash light emission amount control is applied to the main subject at the center. In addition, when switching to a mode such as synchronization during [1], by moving the metering range from the center to a position other than the center, you can obtain the correct exposure even for a sub-subject that is not in the center. By adjusting the exposure flf, a uniform and good image of both the main subject and the sub-subject can be obtained (1).
第１図は本発明の一実施例の回路図、第２図。
第３図は第１図の２２部の波形１′ｆＡ、第４図は中央
重点測光ての側尤分１１ｉ範囲を示す図である。
図中。
１０４：信す処理回路
１０５、＋５０：アナログスイッチ
１０８．１１７：演算増幅器
１１８二基準電圧発生回路
１２３：クロック回路
！２４，１２５：モノステーブルマルチハイブレータ１
２６：アントゲート
１：１１，１３２：反転回路
＋２７．ｌ：ｌ：ｌニオアゲート
代理人 弁理士 １）北 嵩 晴FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of an embodiment of the present invention. FIG. 3 shows the waveform 1'fA of part 22 in FIG. 1, and FIG. 4 shows the side likelihood 11i range of center-weighted photometry. In the figure. 104: Reliable processing circuit 105, +50: Analog switch 108. 117: Operational amplifier 118 Two reference voltage generation circuit 123: Clock circuit! 24,125: Monostable multi-hybrator 1
26: Ant Gate 1: 11, 132: Inversion circuit +27. l:l:l Niorgate agent patent attorney 1) Haru Kitatake
Claims (1)
より得られた画像信号に基づいて、本露光用の露出条件
を決定する撮像装置において、前記撮像素子から前露光
により得られた画像信号の範囲を画像の中央部付近と、
この中央部付近以外に切換えることができる手段を設け
たことを特徴とする撮像装置。In an imaging device that performs pre-exposure before main exposure using an image sensor and determines exposure conditions for main exposure based on the image signal obtained from the pre-exposure, an image signal obtained from the image sensor through pre-exposure. around the center of the image,
An imaging device characterized in that it is provided with a means for switching to a position other than the vicinity of the central part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63067178A JP2714951B2 (en) | 1988-03-23 | 1988-03-23 | Imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63067178A JP2714951B2 (en) | 1988-03-23 | 1988-03-23 | Imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01241277A true JPH01241277A (en) | 1989-09-26 |
| JP2714951B2 JP2714951B2 (en) | 1998-02-16 |
Family
ID=13337373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63067178A Expired - Fee Related JP2714951B2 (en) | 1988-03-23 | 1988-03-23 | Imaging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2714951B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58153465A (en) * | 1982-03-09 | 1983-09-12 | Copal Co Ltd | Still camera using solid-state image pickup element |
| JPS59104867A (en) * | 1982-12-07 | 1984-06-16 | Canon Inc | Device for controlling amount of exposure |
| JPS6032484A (en) * | 1983-08-03 | 1985-02-19 | Canon Inc | Image pickup device |
| JPS6160082A (en) * | 1984-08-31 | 1986-03-27 | Sony Corp | Image pickup device |
-
1988
- 1988-03-23 JP JP63067178A patent/JP2714951B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58153465A (en) * | 1982-03-09 | 1983-09-12 | Copal Co Ltd | Still camera using solid-state image pickup element |
| JPS59104867A (en) * | 1982-12-07 | 1984-06-16 | Canon Inc | Device for controlling amount of exposure |
| JPS6032484A (en) * | 1983-08-03 | 1985-02-19 | Canon Inc | Image pickup device |
| JPS6160082A (en) * | 1984-08-31 | 1986-03-27 | Sony Corp | Image pickup device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2714951B2 (en) | 1998-02-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |