发明名称 |
Image pickup apparatus with white balance control based on brightness |
摘要 |
An image pickup apparatus such as a video camera has the capability of automatic white balance control whereby the white balance is quickly adjusted for any object even just after an operator has turned on a power supply. An image pickup element converts an optical image of an object into an electrical image signal. The image signal is applied to a signal processing circuit and separated into a luminance signal and color signals. The separated color signals or the R and B signals are amplified by gain control circuits under the control of the correction signals supplied by a correction signal computing part, and then applied to a color-difference signal forming circuit which in turn produces color-difference signals (R-Y) and (B-Y). An encoder circuit generates a television signal in the standard form from the above color-difference signals and the luminance signal. In this processing, the white balance is adjusted according to a white balance control signal generated on the basis of information about a state of illuminance onto an object picked up last time and stored in a data storing part.
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申请公布号 |
US6621519(B2) |
申请公布日期 |
2003.09.16 |
申请号 |
US19980009101 |
申请日期 |
1998.01.20 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
NAKAYAMA SATOSHI;MATSUDA HIROMI |
分类号 |
H04N9/04;H04N5/235;H04N9/73;(IPC1-7):H04N9/73 |
主分类号 |
H04N9/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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