Abstract: A video signal decoding apparatus according to the present invention includes a decoding unit for applying a variable length and run-length decoding to a compressed video signal to reconstruct blocks of quantized coefficients. An inverse quantizer is provided for inverse quantizing blocks of reconstructed quantized coefficients. An inverse DCT transforms the inverse quantized blocks of reconstructed quantized coefficients to produce a decoded block. An edge block detector determines whether decoded blocks are classified as an edge block. An adaptive edge enhancement filter removes the distortion in the decoded blocks when the edge block detector classifies decoded blocks as edge blocks. Thus, the video signal is decoded from the encoded video signal.

Abstract: An input frame to be motion compensated is partitioned into smaller blocks of pixel data. First, motion estimation is performed on each block in full-pixel resolution. Then, full-pixel resolution motion vector is refined to half-pixel accuracy by searching the surrounding half-pixel resolution blocks in vertical and horizontal positions with respect to the full-pixel resolution motion vector. An absolute magnitude of a horizontal component of the full-pixel resolution motion vector is examined to see if it is greater or less than a predetermined threshold to detect any significant movement. If the horizontal component absolute magnitude is less than the threshold, a frame-based interpolation will be used for forming the sub-pixel resolution block. If the horizontal component absolute magnitude is greater than the threshold, a field-based interpolation will be used instead.