1. A video camera, comprising: an imager for repeatedly outputting an object scene image captured on an imaging surface; a first detector for detecting a luminance component of the object scene image outputted from said imager; a second detector for detecting a high-frequency component of the object scene image outputted from said imager; a first determiner for determining whether or not a flicker is occurred based on the luminance component detected by said first detector; and a second determiner for determining whether or not a dynamic object exists in the object scene based on the high-frequency component detected by said second detector so as to start said first determiner.