Television standards converters

A television standards converter for converting an input digital video signal from one television standard to another, the standards converter comprising:

• a high-pass filter for filtering said input video signal horizontally and vertically;
• a plurality of parallel processing channels comprising respective means for determining, pixel by pixel of the high-pass filtered video signal, motion vector magnitudes and correlation magnitudes for a range of horizontal and vertical pixel offsets;
• respective low-pass filters for filtering said correlation magnitudes;
• means for determining for each pixel of said video signal, from the relationship between the respective motion vector magnitude and correlation magnitude, a motion vector corresponding to the maximum correlation magnitude;
• and
• a temporal interpolator for deriving interpolated fields or frames by combining sample values offset by the motion vectors determined to correspond to the maximum correlation magnitudes.