Depth detection apparatus, imaging apparatus and depth detection method

A depth detection method performed by a depth detection apparatus that detects depth information on a depth to an object on the basis of a first signal corresponding to luminous flux that passed through a first pupil region of an exit pupil of an imaging optical system, and a second signal corresponding to luminous flux that passed through a second pupil region which is different from the first pupil region,

• the depth detection method comprising:
• a first calculation step of calculating a first shift amount, which is a positional shift amount between the first signal and the second signal;
• a signal processing step of generating a corrected signal by performing filter processing on at least one of the first signal and the second signal, the filter processing being performed to relatively displace the first signal and the second signal by a displacement amount corresponding to the first shift amount;
• and
• a second calculation step of calculating a second shift amount between the first signal and the second signal, which are both filtered in the filter processing, or between signals one of which is filtered in the filter processing and the other one of which is unfiltered.

A non-transitory computer-readable medium storing a computer program, when run by a computer, causing the computer to execute:

• a first calculation step of calculating a first shift amount, which is a positional shift amount between a first signal a the second signal, wherein the first signal corresponds to luminous flux that passed through a first pupil region of an exit pupil of an imaging optical astern and the second signal corresponds to luminous flux that passed through a second pupil region which is different from the first pupil region;
• a signal processing step of generating a corrected signal by performing filter processing on at least one of the first signal and the second signal, the filter processing being performed to relatively displace the first signal and the second signal by a displacement amount corresponding to the first shift amount;
• and
• a second calculation step of calculating a second shift amount between the first signal and the second signal, which are both filtered in the filter processing, or between signals one of which is filtered in the filter processing and the other one of which is unfiltered.