发明名称 |
Method of detecting flicker, and video camera using the method |
摘要 |
Lighting flicker in the output of a video imaging device is detected. The video imaging device has a main picture area divided into pixels for producing successive images at a frame rate. A series of signals are produced from at least one additional picture area adjacent the main picture area, with the additional picture area having a size substantially larger than a pixel. Each of the signals is a function of light incident on the additional picture area in a time period substantially shorter than that of the frame rate. A predetermined number of the signals are accumulated to form a series of compound samples, and the compound samples are filtered to detect components indicating the lighting flicker. The filtering is performed using a bandpass filter tuned to the nominal flicker frequency. The compound samples are formed at a sample rate which is a multiple of the nominal flicker frequency, and the filtering is performed by taking the fundamental output component of a radix-N butterfly.
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申请公布号 |
US6900834(B2) |
申请公布日期 |
2005.05.31 |
申请号 |
US20010939517 |
申请日期 |
2001.08.24 |
申请人 |
STMICROELECTRONICS LIMITED |
发明人 |
HENDERSON ROBERT;SMITH STEWART GRESTY;HURWITZ JONATHAN EPHRIAM DAVID;MURRAY ANDREW |
分类号 |
H04N5/235;(IPC1-7):H04N9/73 |
主分类号 |
H04N5/235 |
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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