| 摘要 |
A fingerprint detection apparatus has a fingerprint sensor (10), which produces a sequence of at least partially overlapping fingerprint frames (13), when a finger (11) is moved in relation to the fingerprint sensor. The apparatus also has a processing device, which is coupled to the fingerprint sensor and produces a complete fingerprint image (14) by computing a relative displacement between respective fingerprint frames and combining the fingerprint frames accordingly. The processing device determines the relative displacement between a first fingerprint frame and a second fingerprint frame by selecting a plurality of subareas in the first fingerprint frame. For each subarea, a respective correlation with the second fingerprint frame is determined. Then a linear combination of the respective correlations is computed, and finally, from the computed linear combination, the relative displacement is determined. |
