A road paver for laying road construction material comprises a tamping beam, a bunker for receiving road construction material, a wheeled chassis with a rear axle and a steerable front axle, and a hydraulic arrangement for permanent or optionally selectable drive of hydraulic motors which are coupled to the front wheels. Output values output from the n magnetosensitive elements in parallel are analyzed to calculate a relative position between the magnetosensitive device and the magnetized scale as a position detection resolution of \u03bbn. Network traffic that is not reported from the host computer system is likely the result of stealth network traffic produced by advanced malware that has hidden its communications by circumventing the legitimate network channels provided by the OS. Interpolated image signal components corresponding to interpolation points are thereby obtained from the interpolating operation processes such that a visible image, in which a character pattern and an image edge portion are free from any step-like pattern and are sharp and a flat portion has an appropriate level of sharpness, can be reproduced from the interpolated image signal components.