Image capturing apparatus and control method thereof

An image capturing apparatus comprising:

• an image sensor, having a plurality of pixels arranged two-dimensionally, that photoelectrically converts an object image formed by an optical imaging system including a focus lens and output an electrical image signal;
• and
• a processor that:
• controls at least one of a readout rate and an exposure condition independently for each of a plurality of different regions of the image sensor;
• calculates a plurality of focus evaluation values based on signals for autofocus processing read out from the pixels present in a first region of a plurality of different regions at a plurality of different focus lens positions while moving the focus lens, and finds an in-focus position of the focus lens based on the plurality of focus evaluation values;
• controls to read out image signals for display to be output to a display unit from a second region that is different from the first region among the plurality of different regions;
• and
• detects whether or not flicker occurs and a frequency of flicker,
• wherein in the case where flicker occurs, the processor controls the exposure condition so that a charge accumulation period of the first region is an integral multiple of the frequency of the flicker, and controls a readout rate of a second region that is different from the first region so as to be an integral multiple of the frequency of the flicker.

A control method for an image capturing apparatus including an image sensor, having a plurality of pixels arranged two-dimensionally, that photoelectrically converts an object image formed by an optical imaging system including a focus lens and outputs an electrical image signal, a first band pass filter, and a second band pass filter that passes a higher band than the first band pass filter, the method comprising:

• calculating a plurality of focus evaluation values based on signals for autofocus processing read out from the pixels present in a first region of a plurality of different regions, and finds an in-focus position of the focus lens based on the plurality of focus evaluation values;
• controlling to read out image signals for display to be output to a display unit from a second region that is different from the first region among the plurality of different regions;
• counting a number of image signals, among image signals for focus detection, that have luminance values greater than or equal to a predetermined value;
• setting, in the case where the number of image signals having luminance values greater than or equal to the predetermined value is less than the predetermined number, the first band pass filter is set, or in the case where the number of image signals having luminance values greater than or equal to the Predetermined value is greater than or equal to the predetermined number, the second band pass filter is set;
• and
• calculating the focus evaluation value using an image signal that has passed through the first band pass filter that has been set or the second band pass filter that has been set.

A control method for an image capturing apparatus including an image sensor, having a plurality of pixels arranged two-dimensionally, that photoelectrically converts an object image formed by an optical imaging system including a focus lens and output an electrical image signal, the method comprising:

• controlling at least one of a readout rate and an exposure condition independently for each of a plurality of different regions of the image sensor;
• calculating a plurality of focus evaluation values based on signals for autofocus processing read out from the pixels present in a first region of a plurality of different regions at a plurality of different focus lens positions while moving the focus lens;
• finding an in-focus position of the focus lens based on the plurality of focus evaluation values;
• controlling to read out image signals for display to be output to a display unit from a second region that is different from the first region among the plurality of different regions;
• detecting whether or not flicker occurs and a frequency of flicker;
• and
• controlling, wherein in the case where flicker occurs, the exposure condition so that a charge accumulation period of the first region is an integral multiple of the frequency of the flicker, and a readout rate of a second region that is different from the first region so as to be an integral multiple of the frequency of the flicker.