JPS62147983U - - Google Patents
Info
- Publication number
- JPS62147983U JPS62147983U JP3636086U JP3636086U JPS62147983U JP S62147983 U JPS62147983 U JP S62147983U JP 3636086 U JP3636086 U JP 3636086U JP 3636086 U JP3636086 U JP 3636086U JP S62147983 U JPS62147983 U JP S62147983U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- white balance
- color temperature
- adjustment
- temperature detection
- 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
- 230000007257 malfunction Effects 0.000 claims description 5
- 230000002265 prevention Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
Description
第１図は本考案の一実施例による白バランス調
整回路の誤動作防止回路の構成図、第２図は白バ
ランス調整回路全体のブロツク図、第３図は上記
誤動作検出回路各部の出力波形図、第４図は従来
の白バランス調整回路を備えたカラービデオカメ
ラを示す図、第５図は色温度検出回路の構成図で
ある。
６…色温度検出回路、１０…誤動作検出回路、
１０Ａ…制御回路、１０Ｂ…誤動作防止回路、５
７…スイツチ回路、５８…ホールド回路、５９…
ローパスフイルタ。
FIG. 1 is a block diagram of a malfunction prevention circuit for a white balance adjustment circuit according to an embodiment of the present invention, FIG. 2 is a block diagram of the entire white balance adjustment circuit, and FIG. 3 is an output waveform diagram of each part of the malfunction detection circuit. FIG. 4 is a diagram showing a color video camera equipped with a conventional white balance adjustment circuit, and FIG. 5 is a configuration diagram of a color temperature detection circuit. 6... Color temperature detection circuit, 10... Malfunction detection circuit,
10A...control circuit, 10B...malfunction prevention circuit, 5
7...Switch circuit, 58...Hold circuit, 59...
low pass filter.
Claims (1)
光の色温度に対応する調整信号を出力する色温度
検出回路と、上記色温度検出回路から出力される
調整信号に基づき撮像素子から得られた映像信号
の白バランスを調整する白バランス用利得制御回
路とを備えた白バランス調整回路において、 上記色温度検出回路と上記白バランス用利得制
御回路と間に設けられたスイツチ回路及びこのス
イツチ回路が遮断している間遮断する直前にスイ
ツチ回路から出力された値を保持するホールド回
路を有する誤動作防止回路と、上記色温度検出回
路から出力される調整信号が急峻に変化するとき
上記スイツチ回路を遮断する制御回路とを備えた
ことを特徴とする白バランス調整回路。 (2) 上記制御回路は色温度検出回路から出力さ
れる調整信号を高域濾波する高域濾波回路と、高
域濾波回路の出力が所定の範囲にあるか否かを比
較し、所定の範囲外にあるときスイツチ回路を遮
断する信号を出力する比較器とを備えていること
を特徴とする実用新案登録請求の範囲第１項記載
の白バランス調整回路。 (3) 上記スイツチ回路とホールド回路との間に
ローパスフイルタを設けたことを特徴とする実用
新案登録請求の範囲第１項または第２項記載の白
バランス調整回路。[Claims for Utility Model Registration] (1) A color temperature detection circuit that outputs an adjustment signal corresponding to the color temperature of the light source obtained by a light receiving element other than an image sensor, and a color temperature detection circuit output from the color temperature detection circuit. A white balance adjustment circuit comprising a white balance gain control circuit that adjusts the white balance of a video signal obtained from an image sensor based on an adjustment signal, wherein the white balance gain control circuit includes a white balance gain control circuit that adjusts the white balance of a video signal obtained from an image sensor based on an adjustment signal; A malfunction prevention circuit having a switch circuit and a hold circuit that holds the value output from the switch circuit immediately before the switch circuit is cut off while the switch circuit is cut off, and an adjustment signal output from the color temperature detection circuit. A white balance adjustment circuit comprising: a control circuit that shuts off the switch circuit when there is a sudden change. (2) The above control circuit compares the high-pass filter circuit that high-pass filters the adjustment signal output from the color temperature detection circuit with the output of the high-pass filter circuit to determine whether or not the output is within a predetermined range. 2. The white balance adjustment circuit according to claim 1, further comprising a comparator that outputs a signal to cut off the switch circuit when the white balance adjustment circuit is outside. (3) The white balance adjustment circuit according to claim 1 or 2, characterized in that a low-pass filter is provided between the switch circuit and the hold circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3636086U JPS62147983U (en) | 1986-03-13 | 1986-03-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3636086U JPS62147983U (en) | 1986-03-13 | 1986-03-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62147983U true JPS62147983U (en) | 1987-09-18 |
Family
ID=30846690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3636086U Pending JPS62147983U (en) | 1986-03-13 | 1986-03-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62147983U (en) |
-
1986
- 1986-03-13 JP JP3636086U patent/JPS62147983U/ja active Pending
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