1. A method for processing pixel amplitude of a block image pixel contained in a video sequence, the method comprising: constructing an individual motion trajectory comprising motion-shifted versions of the block image pixel over a multiplicity of neighboring frames; and combining pixel amplitudes of the motion-shifted versions of the block image pixel along the individual motion trajectory using a weighting function, to form a processed pixel amplitude of the image pixel; generating a video data bit stream that describes the video sequence; and adding a plurality of stop markers to the video data bit stream using a marker adder, wherein each stop marker describes length of a motion trajectory of a given image pixel; wherein the method comprises at least two different process modes; wherein, in each process mode, a maximum number of frames is considered for constructing each motion trajectory of a given image pixel; and wherein a flag is generated which indicates the process mode that has been carried out.