US 11,895,421 B2
Apparatus, method, and storage medium for controlling focus point adjustment operation
Toshiyuki Dobashi, Kanagawa (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jun. 21, 2021, as Appl. No. 17/353,120.
Claims priority of application No. 2020-111994 (JP), filed on Jun. 29, 2020.
Prior Publication US 2021/0409636 A1, Dec. 30, 2021
Int. Cl. H04N 25/772 (2023.01); H04N 23/67 (2023.01); H04N 23/80 (2023.01)
CPC H04N 25/772 (2023.01) [H04N 23/67 (2023.01); H04N 23/80 (2023.01)] 6 Claims
OG exemplary drawing
 
1. A control apparatus to control focal point adjustment operation of an imaging optical system, the control apparatus comprising:
at least one processor;
a memory coupled to the at least one processor, the memory storing instructions that, when executed by the processor, cause the processor to function as:
a calculation unit configured to calculate a focal point evaluation value for each of images captured successively by the imaging optical system;
a determination unit configured to determine whether an amount of change in the focal point evaluation value calculated by the calculation unit with respect to a reference value is greater than or equal to a first threshold;
a first count unit configured to count a number of times the determination unit determines that the amount of change in the focal point evaluation value is greater than or equal to the threshold;
a second count unit configured to count a number of frames;
a storage unit configured to store the number of times counted by the first count unit, wherein the number of times counted by the first count unit 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
a control unit configured to control the imaging optical system so that the focal point adjustment operation is executed in a case where the number of times counted by the first count unit is greater than or equal to a third threshold before the number of frames counted by the second count unit is greater than or equal to the second threshold.