| 摘要 |
Aspects of image capture challenge access are described. In one embodiment, an access service of a computing device directs an imaging system to capture an image including facial fiducial features and determine whether the features correspond to an expected set of features. The access service may also issue a request for a response including, for example, a request to tilt or move the computing device, move an individual's face, or contort an individual's facial features. After the request for the response, the access service may capture a response image. The response image may include an adjustment to facial fiducial features. The access service may further determine whether the adjustment to the facial fiducial features corresponds to the request. Depending upon whether the adjustment corresponds to the request, the access service may permit or deny access to features of the computing device. |
| 主权项 |
1. A non-transitory computer-readable medium embodying program code executable in at least one computing device, the program code being configured to cause the at least one computing device to at least:
issue a request for a user of the at least one computing device to change a physical orientation of the at least one computing device; detect a change of the physical orientation of the at least one computing device based at least in part on a physical orientation of the at least one computing device at a first instance and a physical orientation of the at least one computing device at a second instance; capture, during the first instance, with an image sensor, a first reference image including a first plurality of facial fiducial features and a first field of view, the first reference image being captured based at least in part on a focal point of the image sensor and an aperture setting associated with the image sensor, and the first reference image comprising a first focus value associated with each of a plurality of positions within the first field of view; capture, during the second instance, with the image sensor, a second reference image including a second plurality of facial fiducial features and a second field of view, the second reference image being captured based at least in part on the focal point of the image sensor and an adjustment to the aperture setting associated with the image sensor, the second reference image comprising a second focus value associated with each of a plurality of positions within the second field of view; determine that the user of the at least one computing device is authorized to access at least one function of the at least one computing device based at least in part on:
a comparison between the first plurality of facial fiducial features, the second facial fiducial features, and an expected set of features, the expected set of features being based on at least one of a plurality of facial fiducial features of the user of the at least one computing device, the physical orientation of the at least one computing device at the first instance, the physical orientation of the at least one computing device at the second instance, the first field of view, or the second field of view; and,a determination that a difference between the first focus value associated with each of the plurality of positions within the first field of view and the second focus value associated with each of the plurality of positions within the second field of view is greater than a threshold deviation; and, enable access to the at least one function of the at least one computing device. |
