Image pickup apparatus and image pickup system with point image intensity distribution calculation

An information processing system, comprising:

• a first memory which stores lens aberration data;
• a second memory which stores a sensor light-receiving intensity characteristic representing light-receiving intensities, which are determined on a light receiving surface of an image pickup element, of light fluxes passing through respective regions of an entrance pupil of the image pickup element arranged over the image pickup element, and the light fluxes passing through respective regions of the entrance pupil of the image pickup element are respectively received by divided pixels of the image pickup element;
• and
• a processor,
• wherein the second memory includes instructions that, when executed by the processor, cause the processor to:
• calculate a point image intensity distribution, which represents a light intensity distribution when light from a point light source is received on the light receiving surface of the image pickup element, based on the lens aberration data and the sensor light-receiving intensity characteristic, and
• calculate a correction value for correcting a detected in-focus position based on the point image intensity distribution of each of a plurality of positions on an optical axis.

An image pickup apparatus, comprising:

• an image pickup element that has a plurality of pixels each of which includes divided pixels, wherein the divided pixels respectively receive light fluxes passing through different regions of an exit pupil of an imaging optical system;
• a processor;
• and
• a memory including instructions that, when executed by the processor, cause the processor to:
• read out, from the memory, a correction value for correcting a detected in-focus position calculated based on the point image intensity distribution of each of a plurality of positions on an optical axis, wherein the point image intensity distribution represents a light intensity distribution when light from a point light source is received on a light receiving surface of the image pickup element, based on lens aberration data and a sensor light-receiving intensity characteristic,
• detect an in-focus position, and
• correct the in-focus position with use of the correction value, and
• wherein the sensor light-receiving intensity characteristic represents light-receiving intensities, which are determined on a light receiving surface of the image pickup element, of light fluxes passing through respective regions of an entrance pupil of the image pickup element arranged over the image pickup element.

An information processing method, comprising:

• storing lens aberration data in a first memory;
• storing a sensor light-receiving intensity characteristic in a second memory, the sensor light-receiving intensity characteristic representing light-receiving intensities, which are determined on a light receiving surface of an image pickup element, of light fluxes passing through respective regions of an entrance pupil of the image pickup element arranged over the image pickup element, and the light fluxes passing through respective regions of the entrance pupil of the image pickup element are respectively received by divided pixels of the image pickup element;
• calculating a point image intensity distribution, which represents a light intensity distribution when light from a point light source is received on the light receiving surface of the image pickup element, based on the lens aberration data and the sensor light-receiving intensity characteristic;
• and
• calculating a correction value for correcting a detected in-focus position based on the point image intensity distribution of each of a plurality of positions on an optical axis.

An image pickup method, wherein an image pickup element has a plurality of pixels each of which includes divided pixels, wherein the divided pixels respectively receive light fluxes passing through different regions of an exit pupil of an imaging optical system, the method comprising:

• reading out, from a memory, a correction value for correcting a detected in-focus position calculated based on the point image intensity distribution of each of a plurality of positions on an optical axis, the point image intensity distribution representing a light intensity distribution when light from a point light source is received on a light receiving surface of the image pickup element, based on lens aberration data and a sensor light-receiving intensity characteristic;
• detecting an in-focus position;
• and
• correcting the in-focus position with use of the correction value,
• wherein the sensor light-receiving intensity characteristic represents light-receiving intensities, which are determined on a light receiving surface of the image pickup element, of light fluxes passing through respective regions of an entrance pupil of the image pickup element arranged over the image pickup element.