The invention relates to a method and a device for determining a valid lane marking with the aid of a camera system of a vehicle, in particular a road vehicle. Each carbon segment has an inner portion of molded graphite material adjacent to the base and one or more outer exposed portions, containing or formed of sintered graphite. The test data may be pseudo-random binary sequence data. The motor control device computes the assist command value by adding the second assist component to the first assist component. Alternatively the compositions may be injected or infused directly into the joint. According to the present invention, image encoding efficiency can be improved.