| 摘要 |
Current methods of focusing fingerprint sensors are typically slow and have difficulties in quickly and accurately focusing upon a fingerprint image. The present invention relates to a method of focusing a fingerprint image. The method obtains a partial fingerprint image, adjusts a control parameter value to obtain a focused partial fingerprint image, sets the adjusted focused control parameter value as a focused control parameter value and then obtains a focused full fingerprint image. The present invention also relates to a fingerprint sensing device which is capable of partially scanning a fingerprint image. The fingerprint sensing device comprises a sensing array having a plurality of sensing elements, the sensing array for detecting the ridges and troughs of a fingerprint located on a contact surface of the sensing array. The fingerprint sensing device also comprises a controller being capable of selecting at least one of the sensing elements to form a partial fingerprint image, and a sensing circuit for determining if the selected sensing element or elements are on or off.
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