Patent ID: 7061548

Claim:
A filter device comprising: a controllable temporal noise reduction unit having a first input for receiving a first video signal (Φ 1 ), said controllable temporal noise reduction unit performing a noise reduction operation on said first video signal (Φ 1 ) to provide a filter output signal (Φ 3 ) at a filter output; and adjustment means for detecting a very low amount of motion in a video image of said first video signal (Φ 1 ) and for controlling the controllable temporal noise reduction unit on the basis of the detected very low amount of motion, so as to enable the filter device to reduce cross-luminance and/or cross-color as well when only a very low amount of motion is present in the signal, wherein said adjustment means includes a motion detector having a first input for receiving said first video signal (Φ 1 ), and a second input for receiving a second video signal (Φ 2 ) representing a previous image, said motion detector comprising: a difference detector having inputs coupled to said two inputs of the motion detector, the difference detector producing a difference signal (ΦD) at an output thereof; a pre-filter coupled to the output of the difference detector for attenuating frequencies around a color subcarrier frequency of said first video signal (Φ 1 ); and a motion value calculator coupled to an output of the pre-filter for calculating a motion value (μ) in relationship to the filtered difference signal.