Device and method for measuring a characteristic of an interaction between a user and an interaction device

A device for measuring a predefined characteristic of an interaction likely to be present between an interaction device and a user, comprising:

• an input interface connected to the interaction device and to an image sensor or sound sensor coming from an interaction zone in which the user is likely to be located and thus receive data representative of the interaction, and a classification module connected to the input interface processing:
• a temporal sequence of the image or sound data of the interaction zone;
• and
• a temporal sequence of at least one state variable of the device;
• in order to establish at output a measurement of the predefined characteristic, the classification module having been configured on the basis of temporal sequences of training data marked with the presence or absence of the characteristic.