Image capturing apparatus with autofocus and method of operating the same

1. An image capturing apparatus comprising:

a display unit comprising a display panel, the display unit configured to display an image including at least one subject;

a detection unit comprising detection circuitry, the detection unit configured to detect an input for setting a part of the displayed image as a region of interest; and

a controller configured to:

automatically detect at least one candidate region within the region of interest; and

set one of the at least one detected candidate region as an auto-focus (AF) region, based on priorities of the at least one detected candidate region,

wherein the controller is further configured to:

upon identifying two or more detected candidate regions comprising same priorities, set one of the detected candidate regions as the AF region, based on the priorities of the detected candidate regions and based on which candidate region is closest to a path of AF regions set in previous frames for the image.

2. The image capturing apparatus of claim 1 , wherein the detection unit is configured to track a gaze of a user looking at the display unit, and

the controller is configured to set the region of interest based on a point on the display unit that is intersected by the tracked gaze of the user.

3. The image capturing apparatus of claim 1 , wherein the detection unit is configured to detect a touch input of touching the display unit, and

the controller is configured to set the region of interest with respect to a touched point on the display unit.

4. The image capturing apparatus of claim 1 , wherein the controller is configured to set at least one of a size and a shape of the region of interest based on an input for setting at least one of the size and the shape of the region of interest.

5. The image capturing apparatus of claim 1 , wherein the priorities of the at least one detected candidate region are determined based on types of objects included in the at least one detected candidate region, and wherein the types of objects include one or more of a face of a person, a face of an animal, an object that is not a person or an animal, a line, and a point.

6. The image capturing apparatus of claim 1 , wherein, when one candidate region is detected from the region of interest, the controller is configured to set the one candidate region as the AF region.

7. The image capturing apparatus of claim 1 , wherein when the plurality of the candidate regions is detected within the region of interest, the controller is configured to set one of the plurality of candidate regions having a highest priority from among the detected plurality of candidate regions as the AF region.

8. The image capturing apparatus of claim 1 , wherein the detection unit is configured to detect an input of a gaze moving while the AF region is set, and

the controller is configured to reset a candidate region located in a direction in which the gaze moves with respect to the set AF region, as a new AF region.

9. The image capturing apparatus of claim 1 , wherein the display unit is configured to display the at least one detected candidate region, and the controller is configured to set one of the at least one detected candidate region as the AF region selected based on an input for selecting the one of the at least one detected candidate region.

10. The image capturing apparatus of claim 1 , wherein the display unit is configured to display the set AF region.

11. A method of operating an image capturing apparatus, the method comprising:

displaying an image including at least one subject;

setting a part of the displayed image as a region of interest by detecting an input for setting a region of interest in the displayed image;

automatically detecting at least one candidate region within the set region of interest; and

setting one of the at least one detected candidate regions as an auto-focus (AF) region, based on priorities of the at least one detected candidate region,

wherein, the setting of the AF region further comprises:

upon identifying two or more detected candidate regions comprising same priorities, setting one of the detected candidate regions as the AF region, based on the priorities of the detected candidate regions and based on which candidate region is closest to a path of AF regions set in previous frames for the image.

12. The method of claim 11 , wherein the setting of the region of interest by detecting the input comprises tracking a gaze via a display unit, and setting the region of interest with respect to a point on the display unit that is intersected by the tracked gaze.

13. The method of claim 11 , wherein the setting of the region of interest by detecting the input comprises detecting a touch input of touching a display unit and setting the region of interest with respect to a touched point on the display unit.

14. The method of claim 11 , further comprising setting at least one of a size and a shape of the region of interest based on an input for setting at least one of the size and the shape of the region of interest.

15. The method of claim 11 , wherein the priorities of the at least one detected candidate region are determined based on types of objects included in the at least one detected candidate region, and wherein the types of objects include one or more of a face of a person, a face of an animal, an object that is not a person or an animal, a line, and a point.

16. The method of claim 11 , wherein the setting of one of the at least one detected candidate region as the AF region comprises, when one candidate region is detected from the region of interest, setting the one candidate region as the AF region.

17. The method of claim 11 , wherein the setting of the one of the at least one detected candidate region as the AF region comprises, when a plurality of the candidate regions is detected within the region of interest, setting the one of the plurality of the candidate regions having a highest priority from among the plurality of the candidate regions as the AF region.

18. The method of claim 11 , further comprising:

detecting an input of a moving gaze while the AF region is set; and

resetting a candidate region located in a direction in which the gaze moves with respect to the set AF region, as a new AF region.

19. The method of claim 11 , further comprising:

displaying the at least one detected candidate region; and

detecting an input for selecting one of the at least one detected candidate region, wherein the setting of one of the at least one detected candidate region as an AF region comprises setting the selected candidate region as the AF region.

20. A non-transitory computer-readable recording medium having recorded thereon a program which, when executed, causes a computer of an image capturing apparatus to control the image capturing apparatus to perform at least:

displaying an image including at least one subject;

setting a part of the displayed image as a region of interest by detecting an input for setting a region of interest in the displayed image;

automatically detecting at least one candidate region within the set region of interest; and

setting one of the at least one detected candidate regions as an auto-focus (AF) region, based on priorities of the at least one detected candidate region,

wherein the setting of the AF region further comprises:

upon identifying two or more detected candidate regions comprising same priorities, setting one of the detected candidate regions as the AF region, based on the priorities of the detected candidate regions and based on which candidate region is closest to a path of AF regions set in previous frames for the image.