Login to a computing device based on facial recognition

1. A computer-implemented method, comprising:

authorizing a first user to access a first set of resources on a computing device based on a first authorization level of the first user;

capturing, by an imaging device associated with the computing device, a digital image of a second user while the first user is authorized to access the first set of resources;

identifying, based on the captured digital image, an account for the second user;

providing at the computing device, based on the identifying and while the first user is authorized to access the first set of resources, a prompt to confirm authorization of the second user to the computing device;

receiving a valid response to the prompt; and

in response to receiving the valid response,

determining a second authorization level of the second user to access a second set of resources on the computing device;

changing a current authorization level set at the computing device based on the determined second authorization level of the second user; and

if an absence of the second user is detected based on subsequent images captured by the imaging device, restoring the current authorization level at the computing device to the first authorization level of the first user.

2. The computer-implemented method of claim 1 , further comprising:

changing the current authorization level to an authorization level corresponding to the intersection of the first authorization level of the first user and second authorization level of the second user, while maintaining an authentication of the first user to the computing device.

3. The computer-implemented method of claim 2 , wherein changing the current authorization level comprises removing graphical information associated with the first user displayed on a display of the computing device, and limiting access by the second user to one or more resources of the first set of resources.

4. The computer-implemented method of claim 1 , further comprising:

prohibiting, when the valid response to the prompt is received, user access to the first set of resources.

5. The computer-implemented method of claim 1 , further comprising:

sending, when an invalid response to the prompt is received, the digital image of the second user to a predetermined account or remote device to which the first user has access.

6. The computer-implemented method of claim 5 , wherein the account is an email account of the first user.

7. The computer-implemented method of claim 1 , wherein the digital image comprises multiple potential users, and wherein the identifying comprises:

selecting the second user from among the multiple potential users based on predetermined criteria associated with use of the computing device by the second user, wherein the predetermined criteria comprises a predetermined period of time, a frequency of use of the computing device, or a current location of the computing device.

8. The computer-implemented method of claim 1 , wherein the computing device is a mobile device and the imaging device is a camera coupled to the mobile device.

9. The computer-implemented method of claim 8 , further comprising:

receiving the valid response as a touch gesture in a touch-sensitive area of the mobile device.

10. The computer-implemented method of claim 1 , wherein the identifying is based on a facial gesture captured by the imaging device.

11. A computing device, comprising:

a camera;

one or more processors; and

a memory having instructions stored thereon that, when executed by the processor, cause the device to:

authorize a first user to access a first set of resources provided by the computing device based on a first authorization level of the first user;

capture, by the camera, a digital image of a second user while the first user is authorized to access the first set of resources;

identify, based on the captured digital image, an account for the second user;

provide, based on the identifying, a prompt to confirm authorization of the second user to the computing device;

receive a valid response to the prompt; and

in response to receiving the valid response,

determine a second authorization level for the second user to access a second set of resources on the computing device;

change a current authorization level set at the computing device based on the determined second authorization level of the second user; and

if an absence of the second user is detected based on subsequent images captured by the imaging device, restore the current authorization level at the computing device to the first authorization level of the first user.

12. The computing device of claim 11 , wherein the instructions, when executed, further cause the device to:

change the current authorization level to an authorization level corresponding to the intersection of the first authorization level of the first user and second authorization level of the second user, while maintaining an authentication of the first user to the computing device.

13. The computing device of claim 12 , wherein changing the current authorization level comprises removing graphical information associated with the first user displayed on a display of the computing device, and limiting access by the second user to one or more resources of the first set of resources.

14. The computing device of claim 11 , wherein the instructions, when executed, further cause the device to:

prohibit, when the valid response to the prompt is received, user access to the first set of resources.

15. The computing device of claim 11 , wherein the instructions, when executed, further cause the device to:

send, when an invalid response to the prompt is received, the digital image of the second user to a predetermined account or remote device to which the first user has access.

16. The computing device of claim 15 , wherein the account is an email account of the first user.

17. The computing device of claim 11 , wherein the digital image comprises multiple potential users, and wherein the identifying comprises:

selecting the second user from among the multiple potential users based on predetermined criteria associated with use of the computing device by the second user, wherein the predetermined criteria comprises a predetermined period of time, a frequency of use of the computing device, or a current location of the computing device.

18. The computing device of claim 11 , wherein the computing device is a mobile device.

19. The computing device of claim 18 , further comprising:

receiving the valid response as a touch gesture in a touch-sensitive area of the mobile device.

20. The computing device of claim 11 , wherein the identifying is based on a facial gesture captured by the imaging device.