Mobile terminal and control method thereof

1. A mobile terminal comprising:

a wireless communication unit configured to perform wireless communication;

a main body having first and second cameras facing in different directions;

a display unit configured to display an image captured by the first camera; and

a controller configured to:

activate the second camera when an image compensation mode is set on the mobile terminal,

calculate a location of a light source by using images captured by the first and second cameras,

compensate the image based on the calculated location,

display the compensated image on the display unit,

calculate a direction in which noise due to the light source is prevented to the image based on the calculated location, and

display at least one graphics object indicating the direction on the compensated image, wherein the direction is varied based on the calculated location.

2. The mobile terminal of claim 1 , wherein the controller is further configured to calculate the location of the light source using an amount of light entering the first and second cameras, and compensate the image based on the calculated location.

3. The mobile terminal of claim 2 , wherein the controller is further configured to compensate image noise in the image which appears in different forms depending on the location of the light source.

4. The mobile terminal of claim 3 , wherein, if the light source front-lights the first camera, the controller is further configured to compensate a shadow in the image which is cast by the main body.

5. The mobile terminal of claim 3 , wherein, if the light source back-lights the first camera, the controller is further configured to detect a region including a human face from the image, and compensate the image so that the detected region has a predetermined brightness level.

6. The mobile terminal of claim 2 , wherein the controller is further configured to change a shooting mode of the first camera depending on the calculated location, and compensate the image according to the changed shooting mode.

7. The mobile terminal of claim 6 , wherein the shooting mode includes settings associated with at least one of the following: ISO sensitivity, white balance, flash, shutter speed, and aperture.

8. The mobile terminal of claim 2 , wherein the controller is further configured to analyze a shooting location using a pattern of an image captured by the second camera and compensate the image by using the amount of light entering the first and second cameras according to the analyzed shooting location.

9. The mobile terminal of claim 8 , wherein the controller is further configured to set a scene mode of the first camera to indoors or outdoors according to the analyzed shooting location.

10. The mobile terminal of claim 8 , wherein the controller is further configured to analyze a type of the light source using a pattern of the image captured by the second camera and change a white balance of the first camera according to the analyzed type.

11. The mobile terminal of claim 1 , wherein, if first and second images captured by the first and second cameras are output to the display unit, the compensation mode is executed, and the controller is further configured to compensate at least one of the first and second images by using an amount of light entering the first and second cameras and output at least one compensated image on the display unit.

12. The mobile terminal of claim 11 , wherein the controller is further configured to calculate the average luminance values of the first and second images and compensate at least one of the first and second images so that a difference between the average luminance values satisfy limiting criteria.

13. The mobile terminal of claim 1 , wherein, if the first camera is a front camera on the front of the main body, the controller is further configured to execute the compensation mode simultaneously with the activation of the first camera.

14. A method of controlling a mobile terminal including a main body having first and second cameras facing in different directions, the method comprising:

displaying, via a display unit of the mobile terminal, an image captured by the first camera;

activating, via a controller of the mobile terminal, the second camera when an image compensation mode is executed on the mobile terminal;

calculating, via the controller, a location of a light source by using images captured by the first and second cameras;

compensating, via the controller, the image based on the calculated location;

displaying the compensated image on the display unit;

calculating a direction in which noise due to the light source is prevented to the image based on the calculated location; and

displaying at least one graphics object indicating the direction on the compensated image, wherein the direction is varied based on the calculated location.

15. The method of claim 14 , further comprising:

calculating a location of a light source using the using an amount of light entering the first and second cameras; and

compensating the image based on the calculated location.

16. The method of claim 15 , further comprising:

compensating image noise in the image which appears in different forms depending on the location of the light source.

17. The method of claim 16 , further comprising:

compensating a shadow in the image which is cast by the main body, if the light source front-lights the first camera.

18. The method of claim 16 , further comprising:

detecting a region including a human face from the image, if the light source back-lights the first camera; and

compensating the image so that the detected region has a predetermined brightness level.

19. The method of claim 15 , further comprising:

changing a shooting mode of the first camera depending on the calculated location; and

compensating the image according to the changed shooting mode.