Patent ID: 8773390

Claim:
A device, comprising: a sense circuit coupled to a capacitance sense array having a plurality of capacitance sense elements of a sense surface, the sense circuit configured to detect a human hand on or proximate to the sense surface; and a processing section coupled to the sense circuit, the processing section configured to: receive sense values of the plurality of capacitance sense elements from the sense circuit; create a two-dimensional representation of the human hand from the sense values, wherein the two-dimensional representation includes measurement values derived from the sense values; extract biometric features of the human hand from the two-dimensional representation of the human hand, wherein to extract the biometric features the processing section is configured at least to: determine the extracted biometric features, wherein the extracted biometric features include a dimension associated with a particular portion of the human hand, wherein the dimension is determined based on a measurement region designated by two or more of the measurement values that are included in the two-dimensional representation of the human hand and that identify the particular portion of the human hand, the two or more of the measurement values that designate the measurement region being over a predetermined threshold that is a non-zero value, and wherein the particular portion of the human hand includes one of a finger, a palm, and a gap between locations where portions of the human hand contact the sense surface; and compare the extracted biometric features to stored biometric features to determine a match.