| 摘要 |
A television standards converter for converting an input digital video signal from one television standard to another, comprises a high-pass filter 36 for filtering the input video signal in one or both spatial dimensions, a plurality of parallel processing channels comprising respective circuits 43 to 58 for determining pixel by pixel of the high-pass filtered video signal the correlation magnitudes for a range of horizontal and vertical pixel offsets in an adjacent field, low-pass filters 59 for filtering the resulting correlation magnitudes, a selector 62 for determining for each pixel of said video signal, from the relationship between motion magnitude and the correlation magnitude, the motion vector corresponding to the maximum correlation magnitude, and a temporal interpolator (Figure 14) for deriving interpolated fields or frames by combining sample values offset by the motion vectors. The input may be a progressive scanned signal which is obtained from an interlaced signal by spatial interpolation on the basis of a gradient vector; the latter is derived in a circuit similar to that shown, wherein a pixel is correlated with adjacent pixels on two adjacent lines of the same field. <IMAGE> |
