A method and apparatus are provided for deriving a progressive scan image from an interlaced image. In this, for each pixel to be inserted in the field from the interlaced image a difference value is derived from each pair of a set of symmetrically opposed pixels with respect to the pixel to be reconstructed...http://www.google.com/patents/US7336316?utm_source=gb-gplus-sharePatent US7336316 - De-interlacing of video data
