Conversion of video data from interlaced to non-interlaced format

A method and apparatus are provided for converting an interlaced video signal to a progressive scan video signal. For each pixel in each missing line of a video field in a video signal to be converted correlation data is derived for each of a set of possible interpolations between adjacent pixels to be used in reconstructing the missing pixel. A confidence measure is then derived from the correlation data. Adjustment data dependent on the thus derived confidence measure is then selected and used to adjust the correlation data. The thus adjusted correlation data is then used to determine the interpolation scheme most likely to produce an accurate missing pixel and the missing pixel then interpolated.