Electronic device and method for autofocusing

1. An electronic device comprising:

a display;

a camera module comprising a camera;

a memory; and

a processor connected electrically to the display, the camera module, and the memory,

wherein the memory stores instructions which, when executed by the processor, cause the electronic device to perform at least one operation comprising:

identifying a set shutter input method;

moving a lens of the camera module to a first location if the set shutter input method is one of a plurality of different predetermined shutter input methods;

moving the lens of the camera module to a second location if the set shutter input method is not one of the plurality of predetermined shutter input methods;

perform autofocusing after moving the lens;

receiving a shutter input in accordance with the set shutter input method; and

capturing an image using the camera module in response to the received shutter input,

wherein the first location has a longer focal length than a focal length of the second location, and

wherein the plurality of predetermined shutter input methods comprises a shutter input method using an external electronic device, a shutter input method using a timer, a shutter input method using voice recognition, a shutter input method using face recognition, and a shutter input method using gesture recognition.

2. The electronic device of claim 1 , wherein the instructions, when executed by the processor, cause the electronic device to perform a face recognition function after moving the lens, and to move the lens from the first location to the second location or from the second location to the first location based on failure of the face recognition.

3. The electronic device of claim 1 , wherein the camera module comprises a front image sensor and a rear image sensor, and the instructions, when executed by the processor, cause the electronic device to adjust a focus based on the set shutter input method based on an operating image sensor being the front image sensor and perform autofocusing based on the operating image sensor being the rear image sensor.

4. The electronic device of claim 1 , wherein the instructions, when executed by the processor, cause the electronic device to determine a moved-to lens location as an initial lens location and to perform the autofocusing by readjusting the lens location based on the determined initial lens location.

5. The electronic device of claim 4 , wherein the instructions, when executed by the processor, cause the electronic device to readjust a focus by adjusting the lens location in a direction from a long distance to a short distance if the lens is moved to the first location, and to readjust the focus by adjusting the lens location in a direction from a short distance to a long distance if the lens is moved to the second location.

6. The electronic device of claim 1 , wherein the autofocusing comprises a contrast autofocusing.

7. A method for autofocusing in an electronic device, the method comprising:

identifying a set shutter input method;

moving a lens of a camera module to a first location if the set shutter input method is one of a plurality of different predetermined shutter input methods;

moving the lens of the camera module to a second location if the set shutter input method is not one of the plurality of predetermined shutter input methods;

perform autofocusing after moving the lens;

receiving a shutter input in accordance with the set shutter input method; and

capturing an image in response to the received shutter input,

wherein the first location has a longer focal length than a focal length of the second location, and

wherein the plurality of predetermined shutter input methods comprises a shutter input method using an external electronic device, a shutter input method using a timer, a shutter input method using voice recognition, a shutter input method using face recognition, and a shutter input method using gesture recognition.

8. The method of claim 7 , further comprising:

performing a face recognition function after moving the lens; and

moving a lens location from the first location to the second location or from the second location to the first location based on failure of the face recognition.

9. The method of claim 7 , further comprising:

identifying a currently operating image sensor among a front image sensor and a rear image sensor; and

adjusting a focus based on the set shutter input method based on the front image sensor being identified as the operating image sensor and performing an autofocusing function based on the rear image sensor being identified as the operating image sensor.

10. The method of claim 7 , wherein performing autofocusing comprises:

determining a moved-to lens location as an initial lens location; and

readjusting the lens location based on the determined initial location.

11. The method of claim 10 , wherein readjusting the location of the lens comprises:

readjusting the lens location in a direction from a long distance to a short distance if the lens is moved to the first location; and

readjusting the lens location in a direction from a short distance to a long distance if the lens is moved to the second location.

12. The method of claim 7 , wherein the autofocusing comprises a contrast autofocusing.

13. A non-transitory computer-readable recording medium having recorded thereon at least one program including commands which, when executed, cause an electronic device to perform operations including an autofocusing method,

wherein the autofocusing method comprises:

identifying a set shutter input method;

moving a lens of a camera module to a first location if the set shutter input method is one of a plurality of different predetermined shutter input methods;

moving the lens of the camera module to a second location if the set shutter input method is not one of the plurality of predetermined shutter input methods;

perform autofocusing after moving the lens;

receiving a shutter input in accordance with the set shutter input method; and

capturing an image in response to the received shutter input,

wherein the first location has a longer focal length than a focal length of the second location, and

wherein the plurality of predetermined shutter input methods comprises a shutter input method using an external electronic device, a shutter input method using a timer, a shutter input method using voice recognition, a shutter input method using face recognition, and a shutter input method using gesture recognition.