Imaging apparatus, operation method of imaging apparatus, and program

An operation method of an imaging apparatus, the operation method comprising:

• storing image data obtained by imaging in a memory;
• performing processing of reducing the image data;
• performing first detection processing of detecting a specific subject image showing a specific subject from a reduced image indicated by reduced image data obtained by reducing the image data;
• performing, in a case where the specific subject image is not detected by the first detection processing, second detection processing on pre-reduction image data that is the image data before reduction stored in the memory;
• and
• performing the second detection processing on partial region image data indicating a partial region that is a partial region in an image indicated by the pre-reduction image data and corresponds to a position of the specific subject image detected by the first detection processing in a frame previous to a frame in which the second detection processing is performed.

A non-transitory computer-readable storage medium storing a program for causing a computer to execute a process comprising:

• storing image data obtained by imaging in a memory;
• performing processing of reducing the image data;
• performing first detection processing of detecting a specific subject image showing a specific subject from a reduced image indicated by reduced image data obtained by reducing the image data;
• performing, in a case where the specific subject image is not detected by the first detection processing, second detection processing on pre-reduction image data that is the image data before reduction stored in the memory;
• and
• performing the second detection processing on partial region image data indicating a partial region that is a partial region in an image indicated by the pre-reduction image data and corresponds to a position of the specific subject image detected by the first detection processing in a frame previous to a frame in which the second detection processing is performed.