Information processing apparatus, image capturing apparatus, method, and storage medium

1. An information processing apparatus comprising:

at least one processor; and

a memory coupled to the at least one processor, the memory storing instructions that, when executed by the processor, cause the processor to:

obtain an image;

detect a subject from the obtained image;

calculate a luminance of the subject in the obtained image;

control an exposure based on the luminance of the subject;

detect a portion of the subject from the exposure-controlled image;

calculate a luminance of the subject in the exposure-controlled image;

calculate a luminance of the portion of the subject in the exposure-controlled image;

store, in a case where the portion of the subject is detected, a luminance difference between the calculated luminance of the subject in the exposure-controlled image and the calculated luminance of the portion of the subject in the exposure-controlled image;

determine whether the luminance difference is stored when the subject is detected;

determine, in a case where the luminance difference is stored, whether a change in luminance of the obtained image is less than or equal to a predetermined value;

correct the luminance of the subject, in a case where a change in luminance of the obtained image is less than or equal to the predetermined value, based on the luminance difference; and

control exposure based on the corrected luminance of the subject by the luminance difference.

2. The information processing apparatus according to claim 1 , wherein the instructions further cause the at least one processor to:

determine a scene,

wherein in a case where the scene is a backlight scene, the exposure is controlled based on the corrected luminance based on the luminance difference.

3. The information processing apparatus according to claim 1 , wherein the instructions further cause the at least one processor to:

changes a speed of the exposure control based on the luminance difference.

4. The information processing apparatus according to claim 3 , wherein the greater the speed of the exposure is the greater the luminance difference is.

5. The information processing apparatus according to claim 1 , wherein in a case where a plurality of subjects is detected, a priority is changed based on a detection order or size of each of the detected subjects.

6. The information processing apparatus according to claim 1 , wherein the instructions further cause the at least one processor to:

detects a human body as the subject; and

detect a face as the portion of the subject.

7. The information processing apparatus according to claim 6 , wherein the instructions further cause the at least one processor to:

identify a race, a skin color, or a feature of each part from the face detected by the second detecting unit; and

changes a range of the luminance to be corrected based on statistical data obtained from pieces of information about identified a plurality of faces.

8. An image capturing apparatus comprising the information processing apparatus according to claim 1 .

9. A method comprising:

obtaining an image;

detecting a subject from the obtained image;

calculating a luminance of the subject in the obtained image;

controlling an exposure based on the luminance of the subject;

detecting a portion of the subject from the exposure-controlled image;

calculating a luminance of the subject in the exposure-controlled image;

calculating a luminance of the portion of the subject in the exposure-controlled image;

storing, in a case where the portion of the subject is detected, a luminance difference between the calculated luminance of the subject in the exposure-controlled image and the calculated luminance of the portion of the subject in the exposure-controlled image;

determine whether the luminance difference is stored when the subject is detected;

determine, in a case where the luminance difference is stored, whether a change in luminance of the obtained image is less than or equal to a predetermined value;

correcting the luminance of the subject, in a case where the change in luminance of the obtained image is less than or equal to the predetermined value, based on the luminance difference; and

controlling exposure based on the corrected luminance of the subject by the luminance difference.

10. A non-transitory computer-readable medium storing a program for causing a computer to perform a method comprising:

obtaining an image;

detecting a subject from the obtained image;

calculating a luminance of the subject in the obtained image;

controlling an exposure based on the luminance of the subject;

detecting a portion of the subject from the exposure-controlled image;

calculating a luminance of the subject in the exposure-controlled image;

calculating a luminance of the portion of the subject in the exposure-controlled image;

storing, in a case where the portion of the subject is detected, a luminance difference between the calculated luminance of the subject in the exposure-controlled image and the calculated luminance of the portion of the subject in the exposure-controlled image;

determine whether the luminance difference is stored when the subject is detected;

determine, in a case where the luminance difference is stored, whether a change in luminance of the obtained image is less than or equal to a predetermined value;

correcting the luminance of the subject, in a case where the change in luminance of the obtained image is less than or equal to the predetermined value, based on the luminance difference; and

controlling exposure based on the corrected luminance of the subject by the luminance difference.