NOISE ELIMINATING APPARATUS OF A VIDEO SIGNAL UTILIZING A RECURSIVE FILTER HAVING SPATIAL LOW PASS AND HIGH PASS FILTERS

In a noise eliminating apparatus including a recursive filter having a delay circuit to delay a video signal by only a predetermined period of time, each of recursive coefficients of a plurality of spatial frequency components included in the difference signal between the input video signal and the delayed video signal is changed in accordance with a movement detection output based on the difference signal. Thus, the dimming due to the motion of an image can be reduced to such a level that no visual problem occurs and the high frequency noises are also eliminated because of the correlation between the frames. Therefore, the dimming phenomenon due to the motion of the image in the moving portion can be reduced and the sufficient noise elimating effect can be obtained.