1. A video camera, comprising: an imager which outputs, in a designated cycle, an electronic image representing a scene captured on an imaging surface; an integrator which integrates, in the designated cycle, a high-frequency component of the electronic image outputted from said imager; a first detector which detects a luminance component of the electronic image outputted from said imager; a second detector which detects a maximum integral value and a minimum integral value from among a plurality of integral values calculated by said integrator during a time period equivalent to N (N: integer more than one) multiples of the designated cycle; a first determiner which determines whether or not a flicker is occurred based on the luminance component detected by said first detector; and a second determiner which determines whether or not a predetermined condition is satisfied with respect to the maximum integral value and the minimum integral value detected by said second detector so as to start said first determiner, wherein the predetermined condition is equivalent to a condition under which the maximum integral value exceeds a first threshold value and a divided value obtained by dividing the maximum integral value by the minimum integral value exceeds a second threshold value.