1. A method for occupant classification in a vehicle, comprising: using a seat mat in a vehicle seat for the occupant classification; generating a seat profile as a function of time, using a sensor matrix in the seat mat; determining features on the basis of the seat profile; performing a weight estimation for each of the features, resulting in respective weight estimates; determining an occupant weight for the occupant classification from the respective weight estimates for the respective features; determining a measure of quality for the occupant classification from the weight estimates and the occupant weight; and continuing to use only occupant classifications whose measure of quality is above a predefined threshold value.