IMAGING DEVICE AND FOCUSING CONTROL METHOD

摘要

A phase difference AF processing unit (19) connects detection signals of phase difference detection pixels (52A) in an AF area (53), connects detection signals of phase difference detection pixels (52B) in the AF area (53), and performs a correlation operation with respect to detection signal groups after connection to generate a defocus amount when it is determined that a subject image formed in the AF area (53) includes a high frequency component. The phase difference AF processing unit (19) performs a correlation operation with respect to detection signal groups of phase difference detection pixels (52A, 52B) in each pair line in the AF area (53) to generate the defocus amount when it is determined that the subject image formed in the AF area (53) does not include a high frequency component.

主权项

1. An imaging device comprising:
an imaging element that includes an imaging surface where a plurality of signal detection units is arranged in two dimensions in a row direction and a column direction that is orthogonal to the row direction, the plurality of signal detection units including a first signal detection unit that detects a signal corresponding to a beam that passes through one divided region among divided regions of a pupil region of an imaging optical system divided in the row direction, a second signal detection unit that detects a signal corresponding to a beam that passes through the other divided region, and a third signal detection unit that detects a signal corresponding to beams that pass through the two divided regions, wherein an area which is a focusing target on the imaging surface includes a block where a plurality of pair lines including a plurality of first signal detection unit groups including the plurality of first signal detection units arranged at a first pitch in the row direction and a plurality of second signal detection unit groups including the plurality of second signal detection units arranged at the first pitch in the row direction is arranged in the column direction, wherein positions of the respective first signal detection units that form the plurality of first signal detection unit groups in the row direction are different from each other, and positions of the respective second signal detection units that form the plurality of second signal detection unit groups in the row direction are different from each other, wherein an arrangement pitch of the first signal detection units in a state where the respective first signal detection units that form the plurality of first signal detection unit groups are arranged in the order of positions in the row direction is a second pitch which is smaller than the first pitch, wherein an arrangement pitch of the second signal detection units in a state where the respective second signal detection units that form the plurality of second signal detection unit groups are arranged in the order of positions in the row direction is the second pitch, and wherein the imaging device further comprises a frequency determination unit that determines whether a subject image formed in the area includes a frequency component that is equal to or larger than a first threshold value; a defocus amount generation unit that performs a first generation process of generating a defocus amount by calculating the defocus amount based on a result of a correlation operation with respect to detection signals of the first signal detection unit group and detection signals of the second signal detection unit group for each pair line in the area and by averaging the defocus amounts calculated for each pair line in a case where it is determined by the frequency determination unit that the subject image does not include the frequency component that is equal to or larger than the first threshold value, and performs a second generation process of generating a defocus amount by calculating the defocus amount based on a result of a correlation operation with respect to a detection signal group where detection signals of the first signal detection units that form the plurality of first signal detection unit groups are arranged in the order of positions in the row direction for each block in the area and a detection signal group where detection signals of the second signal detection units that form the plurality of second signal detection unit groups are arranged in the order of positions in the row direction in the block and by averaging the defocus amounts calculated for each block in a case where it is determined by the frequency determination unit that the subject image includes the frequency component that is equal to or larger than the first threshold value; and a focusing control unit that performs a focusing control for the imaging optical system based on the defocus amount generated in the first generation process or the second generation process.