Electronic apparatus and controlling method thereof

1. An electronic apparatus comprising:

a first camera including a first angle of view;

a second camera including a second angle of view;

a display;

an input device configured to obtain a ratio that is set based on a user input; and

at least one processor, wherein, when the ratio is within a first specified range, the at least one processor is configured to set the first camera to a first frame rate, set the second camera to a second frame rate, which is slower than the first frame rate, and control the display to display a first image, which is obtained at the first frame rate by using the first camera,

wherein, when the ratio is within a second specified range, the at least one processor is further configured to set the second camera to a third frame rate, set the first camera to a fourth frame rate, which is slower than the third frame rate, and control the display to display a second image, which is obtained at the third frame rate by using the second camera, and

wherein the at least one processor is further configured to:

control the second camera to enter a sleep mode or a standby mode before the ratio is adjusted through the input device, and

when the ratio is adjusted, control the second camera to wake up.

2. The electronic apparatus of claim 1 , wherein the at least one processor is further configured to:

when the ratio is within the first specified range, obtain the second image at the second frame rate by using the second camera, and

when the ratio is within the second specified range, obtain the first image at the fourth frame rate by using the first camera.

3. The electronic apparatus of claim 1 , wherein the first frame rate comprises a same frame rate as the third frame rate.

4. The electronic apparatus of claim 1 , wherein the second frame rate comprises a same frame rate as the fourth frame rate.

5. The electronic apparatus of claim 1 ,

wherein the first frame rate and the second frame rate are in multiple relation, and

wherein the third frame rate and the fourth frame rate are in multiple relation.

6. The electronic apparatus of claim 5 , wherein the at least one processor is further configured to:

set a frame rate of the first camera by multiples of a frame rate of the second camera, to synchronize the first camera and the second camera with each other.

7. The electronic apparatus of claim 1 , wherein the at least one processor is further configured to:

when the first frame rate or the third frame rate is variably set depending on sensed ambient illumination, variably set the second frame rate or the fourth frame rate to a specified rate depending on the sensed ambient illumination such that the first frame rate is synchronized with the second frame rate or the third frame rate is synchronized with the fourth frame rate.

8. The electronic apparatus of claim 7 , wherein, when a capture command is received through the input device in a state where the first frame rate of the first camera is variably set depending on the sensed ambient illumination, multiple relation is not maintained, and the first camera and the second camera operate asynchronously, the at least one processor is further configured to:

interrupt a frame of the second camera, and

newly start the frame of the second camera in synchronization with a frame of the first camera such that the frame of the second camera is synchronized with the frame of the first camera.

9. The electronic apparatus of claim 1 , wherein the at least one processor is further configured to:

when the ratio is within the second specified range, determine whether the second camera completed auto exposure (AE), auto white balance (AWB), and auto focus (AF), and changed a frame rate of the second camera into the first frame rate, before controlling the display to display the second image.

10. The electronic apparatus of claim 9 , wherein the at least one processor is further configured to:

when the ratio is within the second specified range and the ambient illumination is less than marginal illumination, control the display to display the first image, which is obtained at the first frame rate or at a frame rate adjusted depending on ambient illumination by using the first camera.

11. The electronic apparatus of claim 9 , wherein the at least one processor is further configured to:

when the ratio is within the second specified range, the second camera does not complete the AF, and the frame rate of the second camera is not changed to the first frame rate, control the display to display the first image, which is obtained at the first frame rate or at a frame rate adjusted depending on ambient illumination by using the first camera.

12. The electronic apparatus of claim 1 , wherein the at least one processor is further configured to:

when a range of the ratio is changed from the second specified range to the first specified range by a zoom-out operation, set a frame rate of the first camera to the first frame rate,

control the display to display a first image, which is obtained at the fourth frame rate, before the frame rate of the first camera is changed, and

control the display to display the first image, which is obtained at the first frame rate, after the frame rate of the first camera is changed to the first frame rate.

13. The electronic apparatus of claim 1 , wherein the at least one processor is further configured to:

when a capture command is received through the input device, perform a digital-zoom on the first image or the second image depending on the ratio, or

after cropping the first image and the second image depending on the ratio, utilize the cropped first image and the cropped second image to generate a capture image corresponding to the ratio.

14. The electronic apparatus of claim 1 ,

wherein the first camera is a master providing an image to be output to the display and the second camera is a slave, or vice versa, and

wherein the at least one processor is further configured to perform auto exposure (AE) and auto white balance (AWB) of the slave based on AE information and AWB information of the master.

15. The electronic apparatus of claim 1 , wherein the at least one processor is further configured to:

when the ratio is adjusted to be decreased through the input device after being increased and when the ratio is one, control the second camera to enter a sleep mode or a standby mode.

16. The electronic apparatus of claim 1 ,

wherein the second angle of view is less than the first angle of view, and

wherein the at least one processor is further configured to:

when a capture command is received through the input device while controlling the display to display the second image, which is obtained from the second camera, generate a depth map in an image scene of the second camera by using the first and second cameras.

17. A method of controlling, by at least one processor, an electronic apparatus including a first camera having a first angle of view and a second camera having a second angle of view, the method comprising:

receiving a ratio, which is set by user intention, through an input device;

when the ratio is within a first specified range, setting the first camera to a first frame rate, setting the second camera to a second frame rate, which is slower than the first frame rate, controlling the second camera in a sleep mode or a standby mode, and displaying a first image, which is obtained at the first frame rate by using the first camera, through a display; and

when the ratio is within a second specified range, controlling the second camera to wake up in response to an adjustment of the ratio, setting the second camera to a third frame rate, setting the first camera to a fourth frame rate, which is slower than the third frame rate, and displaying a second image, which is obtained at the third frame rate by using the second camera, through the display.

18. The method of claim 17 , further comprising:

when the ratio is within the first specified range, obtaining the second image at the second frame rate by using the second camera; and

when the ratio is within the second specified range, obtaining the first image at the fourth frame rate by using the first camera.

19. The method of claim 17 , wherein the displaying of the second image through the display includes:

determining whether the second camera completed auto-focus (AF) and changed a frame rate of the second camera into the third frame rate;

when it is determined that the second camera completed AF and changed the frame rate of the second camera into the third frame rate, displaying the second image, which is obtained at the third frame rate by using the second camera, through the display; and

when it is determined that the second camera has not completed AF or changed the frame rate of the second camera into the third frame rate, displaying the first image, which is obtained at the fourth frame rate by using the first camera, through the display.