JPS62147984U - - Google Patents
Info
- Publication number
- JPS62147984U JPS62147984U JP3636186U JP3636186U JPS62147984U JP S62147984 U JPS62147984 U JP S62147984U JP 3636186 U JP3636186 U JP 3636186U JP 3636186 U JP3636186 U JP 3636186U JP S62147984 U JPS62147984 U JP S62147984U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- color temperature
- white balance
- output
- 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.)
- Granted
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
Landscapes
- Processing Of Color Television Signals (AREA)
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
１…プラスオフセツト回路、５２…ローパスフイ
ルタ、５３…マイナスオフセツト回路、５４…第
１比較器、５５…第２比較器、５７…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
DESCRIPTION OF SYMBOLS 1...Plus offset circuit, 52...Low pass filter, 53...Minus offset circuit, 54...First comparator, 55...Second comparator, 57...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
御回路との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
、 上記制御回路は色温度検出回路から出力される
調整信号を低域濾波する低域濾波回路と、上記調
整信号にプラスオフセツト信号を付加するプラス
オフセツト回路と、上記調整信号にマイナスオフ
セツト信号を付加するマイナスオフセツト回路と
、上記低域濾波回路の出力、上記プラスオフセツ
ト回路の出力、上記マイナスオフセツト回路の出
力の大小を比較してスイツチ回路を遮断する信号
を出力する比較回路とを備えていることを特徴と
する白バランス調整回路。 (2) 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挿入した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。[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. In 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, between the color temperature detection circuit and the white balance gain control circuit. a malfunction prevention circuit having a switch circuit provided in the 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. and a control circuit that shuts off the switch circuit when the color temperature suddenly changes; A positive offset circuit that adds a signal, a negative offset circuit that adds a negative offset signal to the adjustment signal, the output of the low-pass filter circuit, the output of the positive offset circuit, and the output of the negative offset circuit. and a comparison circuit that outputs a signal to shut off a switch circuit by comparing the magnitude of the white balance adjustment circuit. (2) The white balance adjustment circuit according to claim 1, characterized in that a low-pass filter is inserted between the switch circuit and the hold circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3636186U JPH0448067Y2 (en) | 1986-03-13 | 1986-03-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3636186U JPH0448067Y2 (en) | 1986-03-13 | 1986-03-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62147984U true JPS62147984U (en) | 1987-09-18 |
| JPH0448067Y2 JPH0448067Y2 (en) | 1992-11-12 |
Family
ID=30846692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3636186U Expired JPH0448067Y2 (en) | 1986-03-13 | 1986-03-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0448067Y2 (en) |
-
1986
- 1986-03-13 JP JP3636186U patent/JPH0448067Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0448067Y2 (en) | 1992-11-12 |
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