fig2 b is a more detailed representation of the three dimensional sub filter 4 of fig1 the sub filter 4 is formed by a series arrangement of a horizontal low pass filter 41 and a combined vertical temporal filter 42 in the horizontal low pass filter 41 the color difference signal v is band limited in the horizontal direction to 1 3 mhz the horizontally band limited color difference signal is band limited in the f y f t plane in the vertical temporal filter 42 this band limitation can be achieved by means of filters whose basic mode of operation corresponds to the mode of operation of the filters shown in fig2 c and 2d it is a characterizing feature of the invention that the pass bands of the vertical temporal filter 32 for the horizontally band limited color difference signal u is chosen to be smaller than the pass bands of the vertical temporal filter 42 for the horizontally band limited color difference signal v the reason for this measure is that the human eye is substantially less sensitive to motion blur as regards the color difference signal u than for motion blur as regards the color difference signal v in other words this means that the color.