| 摘要 |
<p>In an NTSC imaging apparatus, the shutter speed is set to a first value other than N/120 second, and a flicker detecting process is performed on a video signal obtained at the first shutter speed to extract a particular frequency component. If the level of this frequency component is higher than a threshold value, it is determined that photographing is conducted under fluorescent light with a power supply frequency of 50 Hz. If it is not higher than the threshold value, the shutter speed is set to a second value other than N/100 second, and a flicker detecting process is performed on a video signal obtained at the second shutter speed to extract a particular frequency component. If the level of this frequency component is higher than a threshold value, it is determined that photographing is conducted under fluorescent light with a power supply frequency of 60 Hz.</p> |
