Patent ID: 7821547

Claim:
An image sensing apparatus comprising: a first setting unit that sets a charge accumulation period in an image sensor to an integral multiple of ½ a flicker period; a second setting unit that, if a horizontal scan period, which is a period after commencement of reading out a preset line of the image sensor until commencement of reading out a line to be read out next, is changed to be shorter, sets a charge accumulation period of the image sensor after a change in the horizontal scan period to a period that is an integral multiple of ½ the flicker period and is shorter than the charge accumulation period that has been set by the first setting unit; and a controller that controls the image sensor to achieve the charge accumulation periods set by the first and second setting units, wherein, if the horizontal scan period is changed to be shorter under an environment which may cause the flicker, the controller delays a reset commencement timing so that a period in which an image signal of a frame before the change in the horizontal scan period is read out from the image sensor and a period in which the image sensor is reset for a frame after the change in the horizontal scan period do not overlap, and changes a frame rate of the frame after the change in the horizontal scan period.