JPS6413032U - - Google Patents
Info
- Publication number
- JPS6413032U JPS6413032U JP1987099061U JP9906187U JPS6413032U JP S6413032 U JPS6413032 U JP S6413032U JP 1987099061 U JP1987099061 U JP 1987099061U JP 9906187 U JP9906187 U JP 9906187U JP S6413032 U JPS6413032 U JP S6413032U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- detection circuit
- screen area
- outputs
- video signal
- 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 9
- 238000010586 diagram Methods 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 2
Landscapes
- Exposure Control For Cameras (AREA)
Description
第１図は本考案の一実施例の逆光自動検出回路
２を備えたビデオカメラ１の電気的構成を示すブ
ロツク図、第２図は撮像画面の一例を示す図、第
３図は本実施例の動作を説明するための図、第４
図１〜同図３は１垂直走査期間内の各部の信号波
形を示す波形図、第５図は１水平走査期間内の各
部の信号波形を示す波形図、第６図は判別回路１
２の入力対出力特性を示すグラフである。
１……ビデオカメラ、２……逆光自動検出回路
、４……絞り機構、６……映像信号処理部、７…
…絞り機構駆動回路、８……画面上部検出回路、
９……画面中央部検出回路、１０……タイミング
回路、１１……差動増幅回路、１２……レベル判
別回路、Ｇ……撮像画面、Ａ……被写体（人物）
、Ｂ……背景（空）。
Fig. 1 is a block diagram showing the electrical configuration of a video camera 1 equipped with an automatic backlight detection circuit 2 according to an embodiment of the present invention, Fig. 2 is a diagram showing an example of an imaging screen, and Fig. 3 is a diagram showing the present embodiment. Figure 4 for explaining the operation of
1 to 3 are waveform diagrams showing the signal waveforms of each part within one vertical scanning period, FIG. 5 is a waveform diagram showing the signal waveforms of each part within one horizontal scanning period, and FIG.
2 is a graph showing input versus output characteristics of No. 2. DESCRIPTION OF SYMBOLS 1... Video camera, 2... Automatic backlight detection circuit, 4... Aperture mechanism, 6... Video signal processing section, 7...
...Aperture mechanism drive circuit, 8...Screen top detection circuit,
9... Screen center detection circuit, 10... Timing circuit, 11... Differential amplifier circuit, 12... Level discrimination circuit, G... Imaging screen, A... Subject (person)
, B...Background (sky).
Claims (1)
の映像信号レベルを検出する第１検出回路と、 前記特定画面領域以外の残余の背景画面領域の
映像信号レベルを検出する第２検出回路と、 上記各検出回路の出力の差を予め定められたレ
ベルと比較弁別する比較回路とを含み、 各検出回路の出力の差が上記予め定められたレ
ベルを超えるときは、比較回路から絞り補正用信
号を出力することを特徴とする逆光自動検出回路
。[Claims for Utility Model Registration] A first detection circuit that detects the video signal level of a predetermined specific screen area of the captured screen, and a video signal level of the remaining background screen area other than the specific screen area. a second detection circuit; and a comparison circuit that compares and discriminates the difference between the outputs of the respective detection circuits with a predetermined level, and when the difference between the outputs of the respective detection circuits exceeds the predetermined level, the An automatic backlight detection circuit characterized by outputting an aperture correction signal from the circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987099061U JPS6413032U (en) | 1987-06-26 | 1987-06-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987099061U JPS6413032U (en) | 1987-06-26 | 1987-06-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6413032U true JPS6413032U (en) | 1989-01-24 |
Family
ID=31325873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987099061U Pending JPS6413032U (en) | 1987-06-26 | 1987-06-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6413032U (en) |
-
1987
- 1987-06-26 JP JP1987099061U patent/JPS6413032U/ja active Pending
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