Fingerprint authentication

1. An electronic device, comprising:

an imaging device;

a button; and

circuitry configured to

acquire a first fingerprint image captured by the imaging device in which the button is not engaged;

extract first fingerprint features from the first fingerprint image;

store the first fingerprint features as a registered fingerprint image;

acquire a second fingerprint image captured by the imaging device in which the button is engaged;

extract second fingerprint features from the second fingerprint image;

compare the first fingerprint features of the registered fingerprint image and the second fingerprint features extracted from the second fingerprint image; and

calculate and store an amount of distortion of the second fingerprint image based on a result of the comparing.

2. The electronic device of claim 1 , wherein the circuitry is further configured to

determine a third fingerprint image for a state in which the button is not engaged from the calculated amount of distortion of the second fingerprint image; and

compare the third fingerprint image with the registered fingerprint image.

3. The electronic device of claim 2 , wherein the circuitry is further configured to

determine a calculated fingerprint image for a state in which the button is engaged from the registered fingerprint image based upon the amount of distortion between the registered fingerprint image and the second fingerprint image; and

compare a received fingerprint image with the calculated fingerprint image in which the button is engaged.

4. The electronic device of claim 1 , wherein the button comprises a power switch.

5. The electronic device of claim 1 , wherein the button is located below a fingerprint reader of the imaging device.

6. The electronic device of claim 1 , wherein the button is located beside a fingerprint reader of the imaging device.

7. The electronic device of claim 1 , wherein the circuitry is further configured to

determine whether a contacted area of the imaging device for the first fingerprint image exceeds a predetermined area; and

acquire another fingerprint image in which the button is not engaged when the contacted area does not exceed the predetermined area.

8. The electronic device of claim 7 , wherein the predetermined area comprises a plurality of fingerprint images.

9. The electronic device of claim 8 , wherein a sum of non-overlapping areas of the plurality of fingerprint images exceeds the predetermined area.

10. The electronic device of claim 1 , wherein the circuitry is further configured to

determine whether a contacted area of the imaging device for the second fingerprint image exceeds a predetermined area; and

acquire another fingerprint image in which the button is engaged when the contacted area does not exceed the predetermined area.

11. The electronic device of claim 1 , wherein the circuitry is further configured to

determine a direction of force applied to the imaging device from the second fingerprint image in which the button is engaged.

12. The electronic device of claim 11 , wherein the circuitry is further configured to

determine whether a thumb or an index finger is pressing against a detector plane of the imaging device.

13. The electronic device of claim 1 , wherein the circuitry is further configured to

unlock features of the electronic device when a match is determined from the comparing.

14. The electronic device of claim 1 , wherein the circuitry is further configured to

communicate results of the comparing to an external device.

15. A method of authenticating a fingerprint of an electronic device, the method comprising:

capturing a first fingerprint image via an imaging device, wherein a power button is positioned underneath or next to a detector plane of the imaging device;

extracting fingerprint features from the first fingerprint image in which the power button is not engaged;

saving the extracted fingerprint features of the first fingerprint image in which the power button is not engaged as a registered fingerprint image;

extracting fingerprint features from a second fingerprint image on the detector plane in which the power button is engaged;

determining an amount of distortion between the registered fingerprint image and the second fingerprint image;

saving the determined amount of distortion between the registered fingerprint image and the second fingerprint image;

acquiring a third fingerprint image in which the power button is engaged;

removing the amount of distortion from the third fingerprint image; and

comparing the third fingerprint image after the removing with the registered fingerprint image to determine a match.

16. A non-transitory computer-readable storage medium having computer-readable instructions embodied thereon, that when executed by a computing device, executes a method comprising:

capturing a first fingerprint image via an imaging device, wherein a power button is positioned underneath or next to a detector plane of the imaging device;

extracting fingerprint features from the first fingerprint image in which the power button is not engaged;

saving the extracted fingerprint features of the first fingerprint image in which the power button is not engaged as a registered fingerprint image;

extracting fingerprint features from a second fingerprint image on the detector plane in which the power button is engaged;

determining an amount of distortion between the registered fingerprint image and the second fingerprint image;

saving the determined amount of distortion between the registered fingerprint image and the second fingerprint image;

acquiring a third fingerprint image in which the power button is engaged;

removing the amount of distortion from the third fingerprint image; and

comparing the third fingerprint image after the removing with the registered fingerprint image to determine a match.