JPS6413861U - - Google Patents
Info
- Publication number
- JPS6413861U JPS6413861U JP10238687U JP10238687U JPS6413861U JP S6413861 U JPS6413861 U JP S6413861U JP 10238687 U JP10238687 U JP 10238687U JP 10238687 U JP10238687 U JP 10238687U JP S6413861 U JPS6413861 U JP S6413861U
- Authority
- JP
- Japan
- Prior art keywords
- level
- video signal
- controlling
- switching
- detecting
- 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
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Exposure Control For Cameras (AREA)
Description
第１図は本考案の一実施例である絞り自動調整
回路２１を含むビデオカメラ２２の一部の電気的
構成を示すブロツク図、第２図は本実施例および
従来技術のビデオカメラ２２およびビデオカメラ
２によつて逆光状態にある被写体Ａを撮像した場
合に撮像素子２６および撮像素子６が捕らえる像
を簡略化して示す図、第３図は第２図示の走査線
ｌ１に対応する撮像素子２６の出力信号の一例を
示す波形図、第４図は従来技術の絞り自動調整回
路１を含むビデオカメラ２の電気的構成を示すブ
ロツク図、第５図〜第９図は第２図示の走査線ｌ
１に対応する撮像素子６の出力信号の一例をそれ
ぞれ示す波形図である。
２１……絞り自動調整回路、２５……絞り、２
９……逆光補正スイツチ、３０……検波回路、３
１……ホワイトクリツプ回路、３２……比較器、
３４……絞り駆動回路。
FIG. 1 is a block diagram showing a part of the electrical configuration of a video camera 22 including an automatic aperture adjustment circuit 21, which is an embodiment of the present invention, and FIG. A diagram schematically showing the image sensor 26 and the image captured by the image sensor 6 when the camera 2 captures an image of the subject A in a backlit state. FIG. 3 shows the image sensor 26 corresponding to the scanning line l1 shown in the second figure. FIG. 4 is a block diagram showing the electrical configuration of the video camera 2 including the conventional automatic aperture adjustment circuit 1, and FIGS. 5 to 9 show the scanning lines shown in FIG. l
FIG. 1 is a waveform chart showing an example of an output signal of the image sensor 6 corresponding to FIG. 21...Aperture automatic adjustment circuit, 25...Aperture, 2
9... Backlight correction switch, 30... Detection circuit, 3
1... White clip circuit, 32... Comparator,
34...Aperture drive circuit.
Claims (1)
を検出し、映像信号のレベルに対応したレベルの
信号を出力する検出手段と、 前記検出手段の出力に基づいて絞りの開度を制
御する制御手段と、 前記検出手段の前段に設けられ、前記映像信号
の高レベル成分を除去する高レベル成分除去手段
と、 前記高レベル成分除去手段を能動状態と非能動
状態との間で切換える切換え手段とを含むことを
特徴とする絞り自動調整回路。[Claims for Utility Model Registration] Detecting means for detecting the level of a video signal based on incident light passing through the diaphragm and outputting a signal at a level corresponding to the level of the video signal; a control means for controlling the opening degree; a high-level component removal means for removing a high-level component of the video signal, which is provided before the detection means; and a control means for controlling the high-level component removal means between an active state and an inactive state. An automatic aperture adjustment circuit comprising: switching means for switching between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10238687U JPS6413861U (en) | 1987-07-02 | 1987-07-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10238687U JPS6413861U (en) | 1987-07-02 | 1987-07-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6413861U true JPS6413861U (en) | 1989-01-24 |
Family
ID=31332250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10238687U Pending JPS6413861U (en) | 1987-07-02 | 1987-07-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6413861U (en) |
-
1987
- 1987-07-02 JP JP10238687U patent/JPS6413861U/ja active Pending
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