| 摘要 |
This invention relates to a method for determining the velocity of a structured surface, especially a finger surface, moving relative to at least two in the direction of movement positioned sensors, having a predetermined distance between them, the sensors measuring the variation of a predetermined characteristic of said surface, comprising repeated measurements of the finger surface characteristic and detection of a the presence of a predetermined value along to the time axis for each sensor, and based on the time lapse between the occurance of the predetermined value at each sensor, as well as the known distance between the sensors, calculation of the surface velocity relative to the sensors. |
