CPC B41J 11/46 (2013.01) [B41J 11/42 (2013.01); B41J 11/44 (2013.01); G01P 3/38 (2013.01); G06V 10/225 (2022.01)] | 8 Claims |
1. An optical sensor device, comprising:
an application module for applying an irregular pattern of marks to a surface of a medium; and
an optical detector module for acquiring images of the applied marks and for determining an advancement speed of the medium based on the acquired images,
wherein the application module comprises a reservoir and an application device that is in contact with marking fluid provided in the reservoir and with the medium.
|