Control apparatus, control method, storage medium, and imaging control system

A control apparatus comprising:

• a detection unit configured to detect an object area in an image captured by an image capturing apparatus;
• a dividing unit configured to divide the image into a plurality of divided areas;
• a first calculation unit configured to calculate a luminance difference as a difference between a luminance value of the object area and a luminance value of each of the divided areas;
• a second calculation unit configured to calculate a first amount of change as a difference between luminance values of the object area before and after the image capturing apparatus executes exposure control by setting the object area as a photometric area and a second amount of change as a difference between luminance values of the divided area before and after the image capturing apparatus executes exposure control by setting the object area as a photometric area;
• and
• a determination unit configured to determine a photometric area which is used when the image capturing apparatus executes exposure control based on the first amount of change, the second amount of change, and the luminance difference.