Fingerprint scanning with optical navigation

摘要

An optical navigation subsystem may be used when obtaining a candidate fingerprint for a mobile communication device (e.g., for authentication purposes). To accommodate such use of the optical navigation subsystem, the optical navigation subsystem may be adapted to automatically adjust a processed image sensor window from a first set of window dimensions (e.g., suitable for optical navigation) to a second set of window dimensions (e.g., suitable for fingerprint capture). Alternatively, a single, static set of window dimension may be employed in conjunction with stitching algorithms, or other methods suitable for forming candidate fingerprint images by combining a plurality of images obtained using the static set of window dimension.

主权项

1. A method of handling images in a wireless device having an image processor coupled to an image sensor, the method comprising:
transmitting windowing instructions to the image sensor, the windowing instructions specifying at least one of: (a) a size for a window on the image sensor, inside which window images are to be captured, and (b) a placement of a window on the image sensor, inside which window images are to be captured; receiving, from the image sensor, a digital image of a finger captured at the image sensor inside the window defined by the windowing instructions; and processing the digital image in a context of a plurality of previously received digital images to determine a finger motion indication.