Patent ID: 6822691
Filing Date: 2004-11-23
Classification: H04N

Abstract:
In a video signal processing system a method of computing a motion decision value, which comprises the following steps:inputting a video signal with an interlaced video sequence of fields; computing a frame difference signal from a difference between a previous field and a next field in the video sequence; forming a point-wise motion detection signal from the frame difference signal; computing a region-wise motion detection signal from the point-wise motion detection signal and an adjacent point-wise motion detection signal delayed by one field: and forming from the region-wise motion detection signal a motion decision value and outputting the motion decision value for further processing in the video signal processing system; wherein the step of forming the point-wise motion detection signal comprises computing fn(i,h)=TK(dn(i,h)) where fn is the point-wise motion detection signal, i and h define a spatial location of the respective video signal value in a cartesian matrix, TK(Â·) denotes a threshold function represented as TK&af;(y)={1,if&it;â€ƒ&it;y&GreaterEqual;K0,otherwise}in which K is a positive constant, and dn( ) is the low-pass filtered frame difference signal.