Method for Operating an Assistance System for a Vehicle and Assistance System

A method for operating an assistance system for a vehicle, including an object sensor device for determining an object characteristic value representative of coordinates of an object in the environment of the vehicle and a viewing sensor device for determining a direction characteristic value representative of a viewing direction of a driver of the vehicle and for determining a position characteristic value representative of a head position of the driver. According to the method, a projection characteristic value representative of a vector that connects the head position to the object is determined; a first region characteristic value representative of an estimated primary field of view of the driver is determined; an attention characteristic value representative of the probability that the object is at least partially in the field of view of the driver is determined; and a warning function of the vehicle is activated.