| 摘要 |
A system for obtaining a quality image by the use of at least one biometric capacitive fingerprint sensor having a plurality of capacitive sensor cells arranged underneath a surface of dielectric material ( 11 a) and each including at least one capacitor plate, and a plurality of registers, the system comprises the step of modulating any electromagnetic field generated at each capacitor plate in accordance with worst cleaning conditions of said surface ( 11 a) of dielectric material, thereby obtaining a quality image with a correct contrast between ridge and valley of a detected fingerprint.
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