Input procedure comprising the following steps: Providing an
input device (1) comprising an input surface (8) and a
scanner (2) which is oriented to detect a touch of a finger on the input surface (8) forming a touch surface (11a, 11b) and an evaluation unit (3) to assign a control and / or switching function to a movement of the touch surface (11a, 11b) on the input surface (8); Operation of the
input device (1) in an identification mode in which a
surface structure of the contact surface (11a, 11b) of the finger
lying in the input surface (8) during contact is detected by the
scanner (2) and evaluated by the evaluation unit (3) to generate
biometric data; Operation of the
input device (1) in a first detection mode in which a first partial area (9a) of the input surface (8), each covered by the contact surface (11a, 11b), is repeatedly fully or completely detected by means of the
scanner (2) and associated first data are transmitted to the evaluation unit (3); Operation of the input device (1) in a second detection mode, in which a second partial area (9b) of the input surface (8), each covered by the contact surface (11a, 11b), is repeatedly fully or completely detected by means of the scanner (2) and the associated second data is transmitted to the evaluation unit (3); Evaluating the first and second data by the evaluation unit (3) to obtain a first
evaluation result and a second
evaluation result, in order to assign a control and / or switching function to the relative movement of the contact surface (11a, 11b) only if there is a predetermined minimum agreement between the first
evaluation result and the second evaluation result, characterized in that the evaluation unit (3) comprises a primary unit (3a) located closest to the scanner (2), which evaluates at least the first data, and a secondary unit (3b) connected to the first unit (3a) via a data
communication link, which evaluates at least the first data and is superior to the primary unit (3a). that the secondary unit (3b) is designed to reset the primary unit if there is a lack of minimum agreement between its evaluation result and the evaluation result of the primary unit (3a).