Patent ID: 11895421
Assignee: CANON KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. A method of controlling focal point adjustment operation of an imaging optical system, the method comprising:
calculating a focal point evaluation value for each of images captured successively by the imaging optical system;
determining whether an amount of change in the calculated focal point evaluation value with respect to a reference value is greater than or equal to a first threshold;
counting a number of times the amount of change in the focal point evaluation value is determined to be greater than or equal to the first threshold;, counting a number of frames;
storing the number of times wherein the number of times is reset in a case where the number of frames counted by the second count unit is greater than or equal to a second threshold; and
controlling the imaging optical system so that the focal point adjustment operation is executed in a case where the number of times is greater than or equal to a third threshold before the number of frames is greater than or equal to the second threshold.