JPS6427381A - White balance setting circuit for video camera - Google Patents
White balance setting circuit for video cameraInfo
- Publication number
- JPS6427381A JPS6427381A JP62182207A JP18220787A JPS6427381A JP S6427381 A JPS6427381 A JP S6427381A JP 62182207 A JP62182207 A JP 62182207A JP 18220787 A JP18220787 A JP 18220787A JP S6427381 A JPS6427381 A JP S6427381A
- Authority
- JP
- Japan
- Prior art keywords
- white balance
- level
- comparators
- signals
- zero
- 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
Landscapes
- Color Television Image Signal Generators (AREA)
Abstract
PURPOSE:To set automatically always accurate white balance inexpensively by providing a lens drive control means, a mean value forming means of a color difference signal of an object, a control means talking white balance while adjusting the level of a color difference signal so as to make its mean value zero and a setting start means of the white balance. CONSTITUTION:A control signal 300 is supplied from a counter zoom control circuit 20 to a zoom motor drive circuit 18 to drive a zoom lens to the wide edge. R-Y, B-Y signals are integrated by low pass filters 14, 15, become mean DC voltages respectively and inputted to comparators 7, 8. Up-down counters 9, 10 increment their counts when the output of comparators 7, 8 goes to a high level. Gain control amplifiers 1, 2 decrease the gain to approach the level of the R-Y, B-Y signals to zero. When the output of the comparators 7, 8 goes to a low level, the level of both the signals is made close to zero in reverse operation to above. Thus, while a setting control signal 100 is outputted in this way, the white balance is taken automatically.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62182207A JPS6427381A (en) | 1987-07-23 | 1987-07-23 | White balance setting circuit for video camera |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62182207A JPS6427381A (en) | 1987-07-23 | 1987-07-23 | White balance setting circuit for video camera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6427381A true JPS6427381A (en) | 1989-01-30 |
Family
ID=16114226
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62182207A Pending JPS6427381A (en) | 1987-07-23 | 1987-07-23 | White balance setting circuit for video camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6427381A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0358692A (en) * | 1989-07-27 | 1991-03-13 | Matsushita Electric Ind Co Ltd | White balance controller |
-
1987
- 1987-07-23 JP JP62182207A patent/JPS6427381A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0358692A (en) * | 1989-07-27 | 1991-03-13 | Matsushita Electric Ind Co Ltd | White balance controller |
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